v0.15.3: changelog and README

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

.gitea/workflows/ci.yml

@@ -34,11 +34,33 @@ jobs:
         run: go vet ./...
 
       - name: Test with the race detector
-        run: go test -race ./...
+        # Under the job's limit, so a package that hangs panics with the
+        # test it was in and where every goroutine waited, rather than the
+        # job ending at its deadline with nothing said: from 2026-10-15 every
+        # run did, printing nothing after internal/release.
+        run: go test -race -timeout 12m ./...
 
       - name: Build
         run: go build ./...
 
+      # llmgw-kb runs on people's own machines, Windows included, which no
+      # test here runs on: building it for each catches a Unix-only call.
+      - name: Build llmgw-kb for every system
+        run: |
+          for target in windows/amd64 windows/arm64 darwin/amd64 darwin/arm64 linux/amd64 linux/arm64; do
+            CGO_ENABLED=0 GOOS="${target%/*}" GOARCH="${target#*/}" go build -o /dev/null ./cmd/llmgw-kb
+          done
+
+      # The Terraform provider is a module of its own, which ./... above does
+      # not reach. Its tests check its client against docs/admin-api.openapi.json,
+      # so a change to the admin API that breaks the provider fails here. The
+      # acceptance tests (TF_ACC=1) are left out: they need Terraform itself.
+      - name: Test the Terraform provider
+        working-directory: terraform-provider-llmgw
+        run: |
+          go vet ./...
+          go test ./...
+
       # The NVML backend needs cgo and cannot run without a driver, but it must
       # at least keep compiling: it is the only source of NVLink topology and a
       # break would otherwise surface on a GPU node, far from here.

.gitea/workflows/release.yml

@@ -55,6 +55,21 @@ jobs:
             (cd dist && sha256sum "${name}" >> checksums.txt)
           done
 
+          # llmgw-kb, which people run on their own machines to put their
+          # documents into a knowledge base: Windows too, which llmgw itself
+          # does not build for.
+          for target in windows/amd64 windows/arm64 darwin/amd64 darwin/arm64 linux/amd64 linux/arm64; do
+            os="${target%/*}"; arch="${target#*/}"
+            ext=""; [ "$os" = windows ] && ext=".exe"
+            name="llmgw-kb-${version}-${os}-${arch}${ext}"
+            echo "building $name"
+            CGO_ENABLED=0 GOOS="$os" GOARCH="$arch" go build \
+              -trimpath \
+              -ldflags "-s -w -X gitea.mynodes.xyz/ilker/llmgw/internal/version.Version=${version}" \
+              -o "dist/${name}" ./cmd/llmgw-kb
+            (cd dist && sha256sum "${name}" >> checksums.txt)
+          done
+
           # The reverse proxy configurations, so a release page carries
           # everything install.md asks for and the repository is not needed.
           for f in deploy/proxy/Caddyfile deploy/proxy/nginx.conf; do
@@ -91,13 +106,13 @@ jobs:
           # test the cross-compiled ones, which is why the native build is
           # checked rather than assumed.
           ./dist/llmgw-${version}-linux-amd64 --version
+          ./dist/llmgw-kb-${version}-linux-amd64 --version
           cat dist/checksums.txt
 
-      # Signed when the repository has a signing key, so a machine that trusts
-      # it installs nothing the server alone could have put there. Without the
-      # secret nothing is signed and releases are checked on their checksums,
-      # as before; a build that trusts a key refuses those, so the secret has
-      # to be in place before trusted.pub is filled in.
+      # Signed, so a machine that trusts the key built into it installs
+      # nothing the server alone could have put there. `release sign` checks
+      # the signature against that key before writing it, so a secret that
+      # does not match trusted.pub stops the release too.
       - name: Sign the checksums
         env:
           RELEASE_SIGNING_KEY: ${{ secrets.RELEASE_SIGNING_KEY }}
@@ -105,7 +120,15 @@ jobs:
           set -euo pipefail
           version="${GITHUB_REF_NAME:-$(git describe --tags --always)}"
           if [ -z "${RELEASE_SIGNING_KEY:-}" ]; then
-            echo "no RELEASE_SIGNING_KEY secret; releases are not signed"
+            # Builds that carry a trusted key install only signed releases:
+            # publishing an unsigned one would be a release no upgraded
+            # machine accepts, so it stops here instead.
+            if [ -s internal/release/trusted.pub ]; then
+              echo "internal/release/trusted.pub holds a key, and the RELEASE_SIGNING_KEY secret is not set:"
+              echo "add it under Settings -> Secrets, or this release could not be installed anywhere."
+              exit 1
+            fi
+            echo "no RELEASE_SIGNING_KEY secret and no trusted key; releases are not signed"
             exit 0
           fi
           ./dist/llmgw-${version}-linux-amd64 release sign dist/checksums.txt

.gitignore

@@ -5,3 +5,9 @@
 *.db-shm
 .DS_Store
 coverage.out
+# The provider built in place, and what Terraform leaves beside an example.
+/terraform-provider-llmgw/terraform-provider-llmgw
+/terraform-provider-llmgw/examples/.terraform*
+/terraform-provider-llmgw/examples/terraform.tfstate*
+# What a development server run from the checkout writes beside it.
+/secrets/

Makefile

@@ -2,10 +2,11 @@ MODULE  := gitea.mynodes.xyz/ilker/llmgw
 VERSION ?= $(shell git describe --tags --always --dirty 2>/dev/null || echo dev)
 LDFLAGS := -X '$(MODULE)/internal/version.Version=$(VERSION)'
 
-.PHONY: build test race lint fmt clean rename proto proto-tools
+.PHONY: build test race lint fmt vuln check clean rename proto proto-tools
 
 build:
 	go build -ldflags "$(LDFLAGS)" -o bin/llmgw ./cmd/llmgw
+	go build -ldflags "$(LDFLAGS)" -o bin/llmgw-kb ./cmd/llmgw-kb
 
 test:
 	go test ./...
@@ -20,6 +21,17 @@ fmt:
 	go fmt ./...
 	go vet ./...
 
+# Known vulnerabilities reachable from this code, in the standard library and
+# in dependencies. A toolchain left behind is the commonest cause: the go
+# directive in go.mod is what fixes it.
+vuln:
+	go run golang.org/x/vuln/cmd/govulncheck@latest ./...
+
+# What has to pass before a change is merged.
+check: test
+	go vet ./...
+	$(MAKE) vuln
+
 # Regenerate the agent protocol. Generated code is committed, so this only
 # needs running when api/proto changes.
 proto: proto-tools

README.md

@@ -3,20 +3,23 @@
 A single-binary LLM gateway for clusters with multiple InfiniBand fabrics,
 NVLink domains and heterogeneous GPUs.
 
-It serves LLMs running on your own GPU servers (vLLM / SGLang) behind one
-OpenAI-compatible endpoint. Design document: [llmgw-plan.md](llmgw-plan.md).
+It serves LLMs running on your own GPU and CPU servers (vLLM, SGLang,
+llama.cpp, TensorRT-LLM) behind one OpenAI- and Anthropic-compatible
+endpoint, and answers from your own documents. Design document: [llmgw-plan.md](llmgw-plan.md).
 
 ## Getting started
 
-Starting from nothing — no packages installed, no drivers, no nodes — follow
-[docs/install.md](docs/install.md): it builds a control plane, adds a node and
-serves a model, and says plainly which parts llmgw does not install for you.
+On the machine that will be the control plane, with the release binary
+installed:
 
-| Guide | For |
-|---|---|
-| [docs/install.md](docs/install.md) | Standing up a cluster from scratch |
-| [docs/node-onboarding.md](docs/node-onboarding.md) | Adding nodes to one that exists |
-| [docs/onboarding.md](docs/onboarding.md) | Giving people accounts and keys |
+```sh
+sudo llmgw
+```
+
+The setup screens install one machine or three (high availability), check
+them first, and leave a model answering. After that the same command opens
+the console. [docs/quick-install.md](docs/quick-install.md) has the six steps
+from empty servers to a first request; everything else is below.
 
 ## Status
 
@@ -27,25 +30,135 @@ Releases track the roadmap phases; see [CHANGELOG.md](CHANGELOG.md).
 | v0.1.0 | 0 | Skeleton and sim-engine | released |
 | v0.2.0 | 1 | Static router (filter/score/pick, streaming proxy) | released |
 | v0.3.0 | 1.5 | Admission control (priority bands) | released |
-| v0.4.0 | 2 | Agent: GPU/IB discovery, engine supervision | released |
+| v0.4.0 | 2 | Agent: GPU/IB discovery, engine supervision | released as part of v0.5.0 |
 | v0.5.0 | 3 | Control plane: catalog, placement, reconciler, ctl | released |
 | v0.6.0 | 4 | Multi-node placement and fabric awareness | released |
 | v0.7.0 | — | Conversations, agent memory, disk management | released |
 | v0.8.0 | — | PostgreSQL, leader election, agent failover | released |
 | v0.9.0 | — | Managing people and the tenancy tree | released |
-| v1.0.0 | 5 | Tenancy, prefix affinity, benchmarking | planned |
+| v0.10.0 | — | InfiniBand fabrics and NVLink, doctor, node add, engines installed by the nodes | released |
+| v0.11.0 | — | High availability from setup, the setup and console screens, usage sums and per-tenant alerts | released |
+| v0.12.0 | — | The cluster's settings in the store, in force when changed; the firewall switch; wipe | released |
+| v0.13.0 | — | The whole system stopped and started from one command; Qwen3Guard judges, on a GPU and CPUs together | released |
+| v0.14.0 | — | Knowledge bases: documents from people's own machines, kept apart per tenant, answered from | released (v0.14.1: adapters, the tree over the API, the firewall on every machine; v0.14.2: pictures from ComfyUI; v0.14.3: 3D models as jobs; v0.14.4: any ComfyUI workflow as a job, presets, licences; v0.14.5: picture and 3D models that add themselves; v0.14.6: setup that explains every part and lets it be chosen, the gateway on all three HA machines; v0.14.7: the judge sized for its machine; v0.14.8: sign-in with Active Directory, several keys for one outside provider; v0.14.9: sign-in set up from the console, a node's console that shows the machine) |
+| v0.15.0 | — | The company's MCP tools and VS Code through the gateway; guardrails that ask outside services and put redacted values back; answers to similar questions | released (v0.15.1: Strata, a 125B model of experts on one card; a second mirror kept in step; pickled weights refused; a served model's context changed; v0.15.2: a served model moved to more cards; v0.15.3: a model stopped and kept, or removed with its files) |
+| v1.0.0 | 5 | What phase 5 has left: precise KV routing proven on vLLM, the block cost picker, defragmentation across NVLink domains, prefill/decode disaggregation | planned |
 
 As of v0.6.0 a cluster runs unattended: agents report their hardware, the
 control plane places replicas — including ones larger than a single machine —
 models load when someone asks for them and stop when nobody does, and keys,
 budgets and rate limits decide who may use any of it.
 
-Before v1.0.0: tracing, reference documentation, and filtering on `ctl nodes`
-and `ctl replicas` for fleets too large to read a whole table of. Two items
-that were on this list are not gaps: a model falls through to its fallbacks
-when there is no capacity as well as when a budget is spent, and routing
-profiles are chosen by the key rather than by a request header on purpose —
-a header would let any client promote itself into the top priority band.
+Since v0.11.0 (each release's detail is in [CHANGELOG.md](CHANGELOG.md)):
+
+- **Setup that explains, and high availability that is whole** (v0.14.6).
+  `sudo llmgw` lists the parts of an install, each with what it is for and
+  what is missing without it, and every one can be turned off or set: the
+  starter model and its context, the mirror's directory, the judge's
+  categories and what it does when it does not answer, limits, the
+  portal's language, pictures and 3D. With three machines each runs the
+  control plane, with a floating address on the leader, and any one can
+  be lost: on three VMs, cutting the store primary's power lost no
+  request. One ComfyUI serves an environment's models, pictures, 3D and
+  workflows are MCP tools, and `/v1/messages` gives a model's reasoning as
+  thinking blocks.
+- **Picture and 3D models that add themselves** (v0.14.5). Where a node's
+  card fits flux-schnell or triposr and the catalog makes nothing of that
+  kind, the leader adds it on demand, so a new cluster's portal has its
+  Images and 3D pages; the cluster page and the console show each preset
+  and add it by hand, and `presets.auto` turns it off. Stable Fast 3D's
+  colours can be brought to the picture's (`albedo_match`), and every mesh
+  carries its whole licence.
+- **Any ComfyUI workflow, and models by name** (v0.14.4). `POST
+  /v1/workflows/runs` runs a ComfyUI model's workflow as a job, its inputs
+  (text, numbers, choices, images, masks, audio, video, files) declared in
+  the catalog and listed in `/v1/models`. `llmgw ctl model add triposr` or
+  `flux-schnell` adds a tested model with no YAML; a profile may name the
+  card it needs instead of a class, and ComfyUI now installs on V100s. A
+  licence carries what a machine can match, and a person can leave
+  licences out on the profile page so no key of theirs reaches such a
+  model. A 3D job waiting for the one card says what holds it and for
+  about how long.
+- **3D models as jobs** (v0.14.3). `POST /v1/3d/generations` answers with a
+  job, asked after until its mesh is ready to download. ComfyUI makes it on
+  the cluster's own cards, TripoSR being the tested model. The job says how
+  far along it is, the model's licence is written into the GLB, and
+  `per_mesh` prices it. People make them at `/3d` on the portal; `llmgw ctl
+  3d` shows every owner's jobs. A model profile may also load weights of
+  its own, and an admission band may wait longer than the rest, for bulk
+  work.
+- **Pictures from ComfyUI** (v0.14.2). `POST /v1/images/generations` is made
+  by ComfyUI, behind a gate that demands the replica's key, as an engine the
+  agents install from its source checked against a digest. `per_image`
+  prices it, and people make pictures at `/images` on the portal.
+- **Adapters, and the tenancy tree over the API** (v0.14.1). `llmgw ctl
+  kb dataset` and `llmgw ctl train` make a LoRA adapter from a collection
+  on a node's spare GPU memory, kept on the mirror and seen only by its
+  owner. Organizations, teams, projects, keys and memberships are in the
+  admin API and the Terraform provider. The agents' settings are edited
+  with the cluster's, on the portal too, and the firewall setting reaches
+  every machine.
+- **Knowledge bases** (v0.14.0). People put a company's documents in from
+  their own machines with `llmgw-kb`, a separate download for Windows,
+  macOS and Linux that reads PDF, Office, OpenDocument, mail and many more
+  formats and sends text and vectors, never the files. Collections are kept
+  apart per tenant, down to row-level security in PostgreSQL. A chat
+  request, or a part of the tree by default, is answered from them with
+  its sources: [docs/knowledge.md](docs/knowledge.md).
+- **One command for the whole system** (v0.13.0): `llmgw stop`, `start` and
+  `restart`. Qwen3Guard is the guardrails' judge, on a GPU and on CPUs
+  together.
+- **Settings that apply when changed** (v0.12.0). The cluster's
+  configuration lives in the store, the same on every control plane and in
+  force within seconds (`llmgw ctl config`, the console's Settings). The
+  firewall can be switched on and off for the whole cluster.
+- **Security hardening** (v0.11.2): signed releases only, a token on the
+  admin API, engines not run as root, TLS for the agent port, etcd and
+  Patroni, a firewall for llmgw's internal ports, encrypted backups,
+  bounded connections, sign-in throttling, a Content-Security-Policy.
+- **Guardrails** (v0.11.2). Policies check requests and answers for PII,
+  secrets, prompt injection, deny patterns, and with a judge model; they
+  observe or enforce, and attach to any part of the tenancy tree:
+  [docs/guardrails.md](docs/guardrails.md).
+- **Administration** (v0.11.2):
+  - an audit log of every change (`ctl audit`);
+  - staff roles (viewer, operator, billing, admin);
+  - single sign-on through OpenID Connect and provisioning through SCIM
+    2.0;
+  - key lifetime limits, and rotation with overlap (`keys ttl`, `keys
+    rotate`);
+  - usage export as CSV (`ctl usage export`).
+- **Notifications** (v0.11.2): webhooks, signed or Slack-shaped, for a
+  model parked, a node lost, a budget spent and new weights published, and
+  Alertmanager receiver templates.
+- **Traffic and models** (v0.11.2):
+  - request tags, canaries of new weights with automatic rollback, and
+    quality suites gating updates;
+  - a response cache, kept and replayed requests, and batches;
+  - Anthropic's Messages API, and more of OpenAI's (structured output,
+    images, rerank, audio, moderations);
+  - scaling by the clock, and SLO-aware admission;
+  - TensorRT-LLM, MIG, and models imported from Ollama;
+  - routing by what each vLLM replica's cache holds, and LoRA adapters
+    loaded on demand;
+  - other llmgw clusters as providers, and placement that knows racks,
+    PDUs and power caps.
+- **Operations** (v0.11.2):
+  - `server restore`, off-machine backup copies, and secrets in Vault;
+  - forgetting a person, and keeping a project's requests in the cluster;
+  - offline installs from a bundle, and a Helm chart;
+  - tracing from the control plane to the engines;
+  - the admin API in OpenAPI, with a Terraform provider;
+  - the portal in English and Turkish, with its docs at /docs.
+
+Every one of these is in the console as well as on the command line:
+[docs/console.md](docs/console.md).
+
+What is still ahead is in [BACKLOG.md](BACKLOG.md). Two things that look like
+gaps are not: a model falls through to its fallbacks when there is no
+capacity as well as when a budget is spent, and routing profiles are chosen
+by the key rather than by a request header on purpose — a header would let
+any client promote itself into the top priority band.
 
 One thing is worth saying plainly:
 multi-node replicas are proven on a simulated cluster and on real hardware
@@ -58,34 +171,67 @@ them. On such a machine, run `llmgw doctor --json` first and keep the report;
 
 ## Documentation
 
-- [docs/quick-install.md](docs/quick-install.md) — installing on servers, in
-  six steps: start here
-- [docs/install.md](docs/install.md) — the same from nothing, with every option
-  explained: control plane, nodes, engines, weights, first request
-- [docs/quickstart.md](docs/quickstart.md) — one workstation, from source
+Every page is also in the binary: `llmgw docs`, or **Manual** in the console.
+
+**Installing**
+
+- [docs/quick-install.md](docs/quick-install.md) — from empty servers to a
+  first request, in six steps: start here
+- [docs/install.md](docs/install.md) — the same with every option explained,
+  and running the cluster after: monitoring, notifications, single sign-on,
+  the firewall, upgrades, backups
+- [docs/node-onboarding.md](docs/node-onboarding.md) — adding nodes to a
+  cluster that exists
+- [docs/kubernetes.md](docs/kubernetes.md) — the control plane on
+  Kubernetes with the Helm chart, and why GPU nodes stay outside it
+- [docs/kong.md](docs/kong.md) — llmgw behind Kong Gateway, or Kong behind
+  llmgw: the configuration, what Kong counts, and which to choose
 - [docs/fabrics.md](docs/fabrics.md) — InfiniBand fabrics and NVLink: what
   llmgw needs of them, checking a node with `llmgw doctor`, and what to look at
   when a replica spanning nodes will not run
+
+**Running it**
+
+- [docs/console.md](docs/console.md) — the console that bare `llmgw` opens:
+  every view, and the command each of its actions runs
+- [docs/onboarding.md](docs/onboarding.md) — accounts, keys, limits, staff
+  roles and single sign-on
+- [docs/clients.md](docs/clients.md) — using the gateway from code with the
+  official OpenAI and Anthropic SDKs, and llmgw's extensions
+- [docs/guardrails.md](docs/guardrails.md) — checking requests and answers:
+  policies, detectors, a judge model, and where each applies
+- [docs/knowledge.md](docs/knowledge.md) — knowledge bases: collections,
+  who may read them, `llmgw-kb` on people's machines, and answers from
+  documents
 - [docs/choosing-models.md](docs/choosing-models.md) — which models to run,
   how many of each, and where the weights should live
-- [docs/data.md](docs/data.md) — what llmgw stores, what it does not, and
-  what leaves the machine; written for a security review
+
+**Reference**
+
 - [docs/reference.md](docs/reference.md) — every configuration key, generated
   from the structs and checked by a test, so it cannot describe a setting that
   does not exist or miss one that does
-- [deploy/mirror/](deploy/mirror/) — a model mirror, which is the cheapest
-  and most useful thing to build around llmgw
-- [deploy/proxy/](deploy/proxy/) — Caddy and nginx in front of the client
-  port, with streaming and the forwarded headers right
-- [deploy/ha/](deploy/ha/) — running two control planes, and the one health
-  check that has to be right
-- [docs/node-onboarding.md](docs/node-onboarding.md),
-  [docs/onboarding.md](docs/onboarding.md) — adding machines, and adding people
+- [docs/data.md](docs/data.md) — what llmgw stores, what it does not, and
+  what leaves the machine; written for a security review
+- [docs/admin-api.md](docs/admin-api.md) and its OpenAPI document — the
+  admin API, for scripts; [terraform-provider-llmgw/](terraform-provider-llmgw/)
+  manages models, quotas and guardrails with Terraform or OpenTofu
+- [deploy/](deploy/) — [a mirror](deploy/mirror/) on its own machine,
+  [Caddy and nginx](deploy/proxy/) in front of the client port, [two control
+  planes](deploy/ha/) behind a balancer, and [Prometheus, Alertmanager and
+  Grafana](deploy/monitoring/)
+
+**Working on llmgw**
+
+- [docs/development.md](docs/development.md) — built from source on one
+  workstation, no systemd and no `sudo`
+- [llmgw-plan.md](llmgw-plan.md) — the design; [BACKLOG.md](BACKLOG.md) —
+  what is next
 
 ## Building
 
 ```sh
-make build      # bin/llmgw
+make build      # bin/llmgw and bin/llmgw-kb
 make test       # unit tests
 make race       # with the race detector
 ```
@@ -100,8 +246,13 @@ llmgw ctl explain-placement llama    # why a model has not been placed
 llmgw ctl drain gpu-a-01             # move work off a node, one replica at a time
 llmgw ctl cordon gpu-a-01            # stop new placement, leave what runs
 sudo llmgw doctor                    # on a node: what its GPUs, NVLink and fabric need
+llmgw ctl audit --since 24h          # who changed what
+llmgw ctl usage export --from 2026-09-01 --to 2026-10-01 --by project,model
+llmgw ctl kb list                    # knowledge-base collections, grants, defaults
 ```
 
+Bare `llmgw` opens the console, which does all of this from one screen.
+
 `ctl` talks to the admin port (`:9090` by default), not the client-facing one.
 Add `--json` to any command for machine-readable output.
 
@@ -109,6 +260,33 @@ Add `--json` to any command for machine-readable output.
 says nothing about which of six constraints bit, so it prints every candidate
 considered and the reason it was rejected.
 
+## What llmgw adds to a request
+
+Measured with `llmgw ctl bench overhead`. It starts an engine that answers
+at once and a gateway in front of it, in one process on loopback. It sends
+the same load straight to the engine and through the gateway, and reports
+what the gateway added. Run on an Apple M5 (10 CPUs, load about 2) on
+2026-10-16, 10 s a step, 72,000 requests with none failed:
+
+| Through the gateway | added at p50 | added at p99 |
+|---|---|---|
+| bare | 0.06–0.24 ms | 0.10–0.33 ms |
+| with authentication and usage accounting | 0.05–0.32 ms | 0.09–0.37 ms |
+| with the guardrails' pattern checks as well | 0.10–0.42 ms | 0.15–0.49 ms |
+
+The range is across 100 to 2,000 requests a second. The overhead was
+*lowest* at 2,000, most likely because a busier processor keeps its cores
+awake. The guardrails' judge model is not in these figures: a judgment
+takes seconds on CPUs (see [install.md](docs/install.md)) and is a model's
+time, not the gateway's.
+
+The command also prints the gateway's CPU per thousand requests. Gateway,
+engine and load share one process there, so that figure is rough (0.04 to
+0.65 s per thousand in the run above); the latency is the one to quote.
+Figures from a VM on a busy host move with the host: run it where you will
+deploy, and keep the load it prints beside the result. CI runs a one-second
+version on every change (`TestTheGatewaysOverheadIsMeasured`).
+
 ## Running the router
 
 ```sh
@@ -136,8 +314,9 @@ within 1.24x of idle while 500 concurrent batch requests run, against 58x with
 admission off.
 
 Routing profiles select how endpoints are scored: `chat` favours session
-affinity, `batch` favours the shortest queue, `long-context` favours free KV
-cache. Pick one per model in the config, or per request with the
+affinity and the replica that has been answering soonest (its time to first
+token, smoothed), `batch` favours the shortest queue, `long-context` favours
+free KV cache. Pick one per model in the config, or per request with the
 `x-llmgw-profile` header.
 
 ## sim-engine

api/proto/llmgw/v1/agent.proto

@@ -27,9 +27,38 @@ message AgentMessage {
     FabricScanReply fabric_scan = 5;
     FabricTestReply fabric_test = 6;
     UpgradeReply upgrade = 7;
+    KVEvents kv_events = 8;
+    TrainStatus train_status = 9;
+    TrainArtifact train_artifact = 10;
   }
 }
 
+// KVEvents is a change to what one vLLM replica's prefix cache holds, read
+// by the agent from the engine's KV cache events and sent on for the router's
+// precise index (plan §7.5 tier 2).
+//
+// A net effect since the last one, not the events themselves: a block stored
+// and evicted between two sends is not worth the bytes. On every new stream
+// the agent first sends each replica in full, with clear_first set, because a
+// control plane that has just started or taken over knows nothing.
+message KVEvents {
+  string replica_id = 1;
+  // block_size is how many tokens make one of the replica's blocks.
+  int32 block_size = 2;
+  // clear_first says to forget what was known of the replica before applying the
+  // rest: its cache was cleared, its engine restarted, events were lost, or
+  // this is the first piece of a full copy.
+  bool clear_first = 3;
+  // stored and removed are block hashes as vLLM publishes them: the low 64
+  // bits of the sha256_cbor digest.
+  repeated fixed64 stored = 4;
+  repeated fixed64 removed = 5;
+  // problem, when set, is why the replica's events cannot be used — most
+  // likely an engine hashing another way than llmgw configured. Its index is
+  // empty while it stands.
+  string problem = 6;
+}
+
 // ControlMessage is anything the control plane tells a node.
 message ControlMessage {
   oneof msg {
@@ -43,7 +72,59 @@ message ControlMessage {
     FabricScanRequest fabric_scan = 8;
     FabricTestRequest fabric_test = 9;
     UpgradeAgent upgrade = 10;
+    ControlPlanes control_planes = 11;
+    Firewall firewall = 13;
+    RestartAgent restart_agent = 14;
+    AgentSettings agent_settings = 15;
+    TrainStart train_start = 16;
+    TrainCancel train_cancel = 17;
   }
+  // trace is the W3C trace context (traceparent, and tracestate when there
+  // is one) of the control plane's span that sent this command, so what the
+  // agent does for it — fetching weights, launching the engine, waiting for
+  // it to answer — lands in the same trace. Empty when the control plane is
+  // not tracing, and ignored by an agent that is not.
+  map<string, string> trace = 12;
+}
+
+// RestartAgent has the agent start again, as llmgw restart asks of every
+// node: its engines keep serving and are taken over again.
+message RestartAgent {
+  string reason = 1;
+}
+
+// Firewall is whether llmgw's firewall is kept on the node — its nftables
+// table, which lets the cluster's networks alone reach the engines' ports and
+// the node exporter — sent when an agent registers and whenever the
+// cluster's settings change it (firewall.enabled).
+message Firewall {
+  bool enabled = 1;
+  // networks are let in besides those the node reaches the control planes
+  // on: firewall_networks, networks or single addresses.
+  repeated string networks = 2;
+  // engine_ports_from and engine_ports_to are the engines' ports
+  // (control.port_range).
+  int32 engine_ports_from = 3;
+  int32 engine_ports_to = 4;
+}
+
+// AgentSettings is what the cluster's settings say of this node's agent
+// (agents.default, with agents.nodes.<id> over it), sent when it registers
+// and whenever they change. The agent keeps it beside agent.yaml, which
+// holds only what it needs to start; over that file, it is what the agent
+// runs on. A change from what it runs on has the agent start again on it,
+// its engines serving throughout.
+message AgentSettings {
+  // yaml is agent.yaml's keys, as YAML; empty for none.
+  string yaml = 1;
+}
+
+// ControlPlanes is every control plane an agent may dial, sent by the leader
+// when an agent registers and whenever the list changes. The agent keeps it
+// beside its configuration, so a second control plane added after the node
+// was onboarded is one it fails over to without anybody editing the node.
+message ControlPlanes {
+  repeated string servers = 1;
 }
 
 // Register is the first message on every stream. It carries the node's full
@@ -157,6 +238,9 @@ message Host {
   // nvidia_driver is the driver version, empty when there is none. A card
   // without a driver is not a GPU anything can use.
   string nvidia_driver = 6;
+  // mem_bandwidth_gbs is how fast the memory reads, in GB/s, measured when
+  // the agent started: what decides a model's speed on the CPU. 0 unknown.
+  double mem_bandwidth_gbs = 7;
 }
 
 // Storage is one filesystem a node keeps weights on.
@@ -208,6 +292,11 @@ message RunningShard {
   // restart could not be compared with the catalog — which is exactly when the
   // catalog is most likely to have been edited.
   string profile_fp = 15;
+
+  // compute is where its engine said it put the model when it became ready,
+  // kept by the agent across its own restarts: a control plane that takes
+  // over, or restarts, learns it here.
+  Compute compute = 16;
 }
 
 message GPU {
@@ -243,6 +332,32 @@ message GPU {
   string cluster_uuid = 19;
   string clique_id = 20;
   string fabric_bandwidth = 21;
+  // mig is set when this is a MIG instance rather than a whole card. index
+  // is then 1000 + 100 × card + device, uuid the instance's (MIG-…), and
+  // memory the instance's share; utilization_percent stays zero, because no
+  // driver measures it per instance.
+  MIGDevice mig = 22;
+  // How the card is linked to its host: the fastest generation card and
+  // slot allow together, the card's own fastest, and the lanes in use and
+  // the card's most. Zero when the driver did not say.
+  int32 pcie_gen = 23;
+  int32 pcie_gpu_gen = 24;
+  int32 pcie_width = 25;
+  int32 pcie_width_max = 26;
+}
+
+// MIGDevice is which card a MIG instance is carved from, and how.
+message MIGDevice {
+  int32 parent_index = 1;
+  string parent_uuid = 2;
+  // parent_memory_total_mb is the whole card's: the class is named from it.
+  int32 parent_memory_total_mb = 3;
+  // device is the instance's number on its card, as nvidia-smi -L lists it.
+  int32 device = 4;
+  // profile is NVIDIA's name for the slice, like 3g.40gb.
+  string profile = 5;
+  int32 gpu_instance = 6;
+  int32 compute_instance = 7;
 }
 
 message FabricAttachment {
@@ -304,6 +419,35 @@ message GPUSensor {
   // throttle names what is holding the clocks down now: sw_power_cap,
   // hw_slowdown, sw_thermal, hw_thermal, power_brake.
   repeated string throttle = 6;
+  // How busy the card is, sampled with the rest, rather than read once at
+  // registration. -1 is not reported by the driver. memory_total_mb is set
+  // by every agent that sends these, so zero there is an older agent.
+  double utilization_percent = 7;
+  double memory_utilization_percent = 8;
+  double memory_used_mb = 9;
+  double memory_total_mb = 10;
+  double sm_clock_mhz = 11;
+  // ecc_uncorrected counts uncorrected ECC errors since the driver loaded.
+  double ecc_uncorrected = 12;
+  // What wears the card out, read every minute; has_wear says these are
+  // present. Counts of -1 are not reported for this card.
+  bool has_wear = 13;
+  int64 pcie_replays = 14;
+  int64 retired_pages_sbe = 15;
+  int64 retired_pages_dbe = 16;
+  bool retirement_pending = 17;
+  int64 remapped_rows_correctable = 18;
+  int64 remapped_rows_uncorrectable = 19;
+  bool remap_pending = 20;
+  bool remap_failure = 21;
+  int64 nvlink_crc_errors = 22;
+  int64 nvlink_replay_errors = 23;
+  int64 nvlink_recovery_errors = 24;
+  // xid_errors are the driver's error events since the agent started.
+  int64 xid_errors = 25;
+  int32 last_xid = 26;
+  string last_xid_text = 27;
+  int64 last_xid_unix = 28;
 }
 
 // ShardLoad is one engine process group's use.
@@ -445,6 +589,20 @@ message Heartbeat {
   IMEX imex = 17;
   // cpu_count as in Register, for a VM given more CPUs while it runs.
   int32 cpu_count = 18;
+
+  // gpu_foreign_memory_mb, indexed by GPU, is what processes that are not
+  // this agent's shards hold on each card, read afresh every heartbeat. What
+  // keeps a card out of placement for another tenant is decided from this
+  // rather than from registration: a card that had something else on it when
+  // the agent started is not taken forever, and one that gains a tenant later
+  // is not handed out. Empty from an agent that does not measure it, or from
+  // one that could not this time.
+  repeated int32 gpu_foreign_memory_mb = 19;
+
+  // mem_bandwidth_gbs is how fast the node's memory reads, in GB/s, once
+  // the agent has measured it — in the background after it starts, so a
+  // registration usually has none yet. 0 means not measured.
+  double mem_bandwidth_gbs = 20;
 }
 
 // Provision is the software a node should have: which engines, at which
@@ -465,6 +623,18 @@ message Provision {
 message EngineWant {
   string engine = 1;  // "llamacpp"
   string version = 2; // "b10991"
+  // variant is the build to install, when one is chosen for the node rather
+  // than left to its hardware: "cu13", "cu129". Empty is the agent's choice.
+  string variant = 3;
+  // offline_base, on a cluster with no way to the internet, is where this
+  // engine version's files are on its mirror:
+  // http://mirror:8081/_llmgw/engines/llamacpp/b10991. Set, the node never
+  // asks the engine's publisher.
+  string offline_base = 4;
+  // offline_sha256 is each of those files' checksum by name, from the
+  // bundle the control plane trusts — not from the mirror, which serves
+  // every node over plain HTTP.
+  map<string, string> offline_sha256 = 5;
 }
 
 // ProvisionStatus is where one engine's installation stands on a node.
@@ -478,6 +648,18 @@ message ProvisionStatus {
   string detail = 5;
 }
 
+// Compute is where an engine runs its model, as it said when it loaded it.
+message Compute {
+  // backend is "CUDA", "Vulkan", "Metal" or "CPU".
+  string backend = 1;
+  // devices are the devices it named: "CUDA0: Quadro RTX 6000 (7.5)".
+  repeated string devices = 2;
+  // layers_offloaded of layers_total went to the devices; both 0 when the
+  // engine did not say.
+  int32 layers_offloaded = 3;
+  int32 layers_total = 4;
+}
+
 // ShardStatus reports a shard's lifecycle transition.
 message ShardStatus {
   string node_id = 1;
@@ -499,6 +681,10 @@ message ShardStatus {
   // going to look.
   FetchProgress fetch = 8;
 
+  // compute is what the engine says it computes on, read from its own output
+  // as it became ready: sent with STATE_READY when the engine says.
+  Compute compute = 9;
+
   enum State {
     STATE_UNSPECIFIED = 0;
     STATE_PENDING = 1;
@@ -572,6 +758,15 @@ message EngineProfile {
   map<string, string> env = 9;
   string model_path = 10;
   string served_model_name = 11;
+  // adapters are LoRA adapters loaded beside the model, in order: the index
+  // is the id a request applies one by.
+  repeated LoraAdapter adapters = 12;
+  // kv_events has a vLLM engine publish its KV cache events to the agent, for
+  // the router's precise index.
+  bool kv_events = 13;
+  // allow_pickle lets the node fetch weights in a pickle format, which run
+  // code when loaded: the catalog's allow_pickle, set on purpose.
+  bool allow_pickle = 14;
 }
 
 // RemoveWeights deletes cached model files a node no longer needs.
@@ -704,3 +899,62 @@ message UpgradeReply {
   string version = 2;
   string error = 3;
 }
+
+// LoraAdapter is one adapter: the name clients ask for it by, and its source,
+// which the agent fetches as it does the model's weights.
+message LoraAdapter {
+  string name = 1;
+  string source = 2;
+}
+
+// TrainStart has a node train a LoRA adapter (BACKLOG F4): on a base model's
+// weights from its registry, on question/answer pairs, with a Python trainer
+// the agent carries, in an environment it makes over an installed engine's.
+// One at a time per node.
+message TrainStart {
+  string job_id = 1;
+  // base_repo and base_revision name the base model's weights on its
+  // registry (Hugging Face): safetensors, not the GGUF a catalog may serve.
+  string base_repo = 2;
+  string base_revision = 3;
+  // data is the training pairs, NDJSON of {"q", "a"}.
+  bytes data = 4;
+  // params is the trainer's settings as JSON: rank, alpha, epochs, lr,
+  // batch, max_len.
+  string params = 5;
+  // gpu_memory_mib is what the job needs of a card; the agent starts it
+  // only when one has that much free, which lets it run beside an engine.
+  int32 gpu_memory_mib = 6;
+  // gguf asks for the adapter in llama.cpp's format too.
+  bool gguf = 7;
+}
+
+// TrainCancel stops a training job.
+message TrainCancel {
+  string job_id = 1;
+}
+
+// TrainStatus is how a training job is going, sent as it changes.
+message TrainStatus {
+  string job_id = 1;
+  // state is preparing, running, done or failed.
+  string state = 2;
+  int32 step = 3;
+  int32 steps = 4;
+  double loss = 5;
+  // message is what is being done, or why it failed.
+  string message = 6;
+  // peak_mib is the most the job held of the card.
+  int32 peak_mib = 7;
+}
+
+// TrainArtifact is a piece of what a training job made, sent before its
+// final status: a gzipped tar of the PEFT adapter (kind peft), or the GGUF
+// adapter (kind gguf).
+message TrainArtifact {
+  string job_id = 1;
+  string kind = 2;
+  int32 seq = 3;
+  bytes data = 4;
+  bool last = 5;
+}

cmd/llmgw-kb/main.go

@@ -0,0 +1,467 @@
+// Command llmgw-kb puts a person's documents into an llmgw knowledge base
+// from their own machine (BACKLOG F2): it reads the files there, cuts them
+// into chunks, has the gateway embed them with the person's key, and sends
+// the text and vectors — only for what changed since the last run, which a
+// ledger on the machine remembers.
+//
+// Its own binary, for Windows, macOS and Linux: it carries none of the
+// server, agent or setup code that llmgw does.
+package main
+
+import (
+	"bufio"
+	"context"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"os"
+	"os/signal"
+	"path/filepath"
+	"strings"
+	"text/tabwriter"
+	"time"
+
+	"github.com/spf13/cobra"
+	"golang.org/x/term"
+
+	"gitea.mynodes.xyz/ilker/llmgw/internal/kb/extract"
+	"gitea.mynodes.xyz/ilker/llmgw/internal/kb/kbsync"
+	"gitea.mynodes.xyz/ilker/llmgw/internal/version"
+)
+
+func main() {
+	if err := root().Execute(); err != nil {
+		fmt.Fprintln(os.Stderr, "error:", err)
+		os.Exit(1)
+	}
+}
+
+// config is what `login` keeps: the gateway, the key, and for a personal key
+// the project it acts in.
+type config struct {
+	Gateway string `json:"gateway"`
+	Key     string `json:"key"`
+	Project string `json:"project,omitempty"`
+	CA      string `json:"ca,omitempty"`
+}
+
+func configPath() (string, error) {
+	dir, err := os.UserConfigDir()
+	if err != nil {
+		return "", err
+	}
+	return filepath.Join(dir, "llmgw-kb", "config.json"), nil
+}
+
+// loadConfig reads the saved configuration, with the environment over it:
+// LLMGW_URL, LLMGW_API_KEY, LLMGW_PROJECT.
+func loadConfig() (config, error) {
+	var c config
+	if p, err := configPath(); err == nil {
+		if b, err := os.ReadFile(p); err == nil {
+			if err := json.Unmarshal(b, &c); err != nil {
+				return c, fmt.Errorf("%s: %w", p, err)
+			}
+		}
+	}
+	for env, dst := range map[string]*string{"LLMGW_URL": &c.Gateway, "LLMGW_API_KEY": &c.Key, "LLMGW_PROJECT": &c.Project} {
+		if v := strings.TrimSpace(os.Getenv(env)); v != "" {
+			*dst = v
+		}
+	}
+	return c, nil
+}
+
+func client(flags *globalFlags) (*kbsync.Client, error) {
+	c, err := loadConfig()
+	if err != nil {
+		return nil, err
+	}
+	if flags.gateway != "" {
+		c.Gateway = flags.gateway
+	}
+	if flags.project != "" {
+		c.Project = flags.project
+	}
+	if flags.ca != "" {
+		c.CA = flags.ca
+	}
+	if c.Gateway == "" || c.Key == "" {
+		return nil, errors.New("no gateway or key: run `llmgw-kb login`, or set LLMGW_URL and LLMGW_API_KEY")
+	}
+	h, err := kbsync.NewHTTP(c.CA)
+	if err != nil {
+		return nil, err
+	}
+	return &kbsync.Client{Base: c.Gateway, Key: c.Key, Project: c.Project, HTTP: h}, nil
+}
+
+type globalFlags struct {
+	gateway, project, ca, ledger string
+}
+
+func (g *globalFlags) openLedger(ctx context.Context) (*kbsync.Ledger, error) {
+	p := g.ledger
+	if p == "" {
+		var err error
+		if p, err = kbsync.DefaultLedgerPath(); err != nil {
+			return nil, err
+		}
+	}
+	return kbsync.OpenLedger(ctx, p)
+}
+
+func root() *cobra.Command {
+	g := &globalFlags{}
+	cmd := &cobra.Command{
+		Use:   "llmgw-kb",
+		Short: "Put your documents into an llmgw knowledge base, from this machine",
+		Long: `llmgw-kb reads documents on this machine, cuts them into chunks, has the
+gateway embed them with your key, and sends the text and vectors to a
+knowledge base. Files are never uploaded. Run it as often as you like: a
+ledger on this machine remembers what was sent, and only what changed is
+read and sent again.`,
+		Version:       version.Version,
+		SilenceUsage:  true,
+		SilenceErrors: true,
+	}
+	cmd.PersistentFlags().StringVar(&g.gateway, "gateway", "", "the gateway's address (default: from login, or LLMGW_URL)")
+	cmd.PersistentFlags().StringVar(&g.project, "project", "", "the project a personal key acts in (default: from login, or LLMGW_PROJECT)")
+	cmd.PersistentFlags().StringVar(&g.ca, "ca", "", "a PEM file of certificates to trust besides the system's")
+	cmd.PersistentFlags().StringVar(&g.ledger, "ledger", "", "the ledger file (default: in your configuration directory)")
+	cmd.AddCommand(loginCmd(g), collectionsCmd(g), syncCmd(g), statusCmd(g), historyCmd(g), formatsCmd())
+	return cmd
+}
+
+func loginCmd(g *globalFlags) *cobra.Command {
+	return &cobra.Command{
+		Use:   "login",
+		Short: "Save the gateway's address and your key",
+		Long: `Asks for the gateway's address and your API key, checks them, and saves them
+in your configuration directory, readable by you only. The key is typed
+without being shown, so it does not end up in your shell's history.`,
+		Args: cobra.NoArgs,
+		RunE: func(cmd *cobra.Command, _ []string) error {
+			c, _ := loadConfig()
+			in := bufio.NewReader(os.Stdin)
+			ask := func(q, def string) string {
+				if def != "" {
+					fmt.Fprintf(cmd.OutOrStdout(), "%s [%s]: ", q, def)
+				} else {
+					fmt.Fprintf(cmd.OutOrStdout(), "%s: ", q)
+				}
+				s, _ := in.ReadString('\n')
+				if s = strings.TrimSpace(s); s == "" {
+					return def
+				}
+				return s
+			}
+			c.Gateway = strings.TrimRight(ask("Gateway address (https://…)", or(g.gateway, c.Gateway)), "/")
+			fmt.Fprint(cmd.OutOrStdout(), "API key: ")
+			var key string
+			if term.IsTerminal(int(os.Stdin.Fd())) {
+				b, err := term.ReadPassword(int(os.Stdin.Fd()))
+				fmt.Fprintln(cmd.OutOrStdout())
+				if err != nil {
+					return err
+				}
+				key = strings.TrimSpace(string(b))
+			} else {
+				key, _ = in.ReadString('\n')
+				key = strings.TrimSpace(key)
+			}
+			if key != "" {
+				c.Key = key
+			}
+			c.Project = ask("Project, for a personal key (empty for a project's key)", or(g.project, c.Project))
+			if g.ca != "" {
+				c.CA = g.ca
+			}
+			h, err := kbsync.NewHTTP(c.CA)
+			if err != nil {
+				return err
+			}
+			cl := &kbsync.Client{Base: c.Gateway, Key: c.Key, Project: c.Project, HTTP: h, Wait: time.Second}
+			ctx, cancel := context.WithTimeout(cmd.Context(), 30*time.Second)
+			defer cancel()
+			cs, err := cl.Collections(ctx)
+			if err != nil {
+				return fmt.Errorf("the gateway refused: %w", err)
+			}
+			p, err := configPath()
+			if err != nil {
+				return err
+			}
+			if err := os.MkdirAll(filepath.Dir(p), 0o700); err != nil {
+				return err
+			}
+			b, _ := json.MarshalIndent(c, "", "  ")
+			if err := os.WriteFile(p, b, 0o600); err != nil {
+				return err
+			}
+			fmt.Fprintf(cmd.OutOrStdout(), "Saved in %s. This key reaches %d collection(s); `llmgw-kb collections` lists them.\n", p, len(cs))
+			return nil
+		},
+	}
+}
+
+func or(a, b string) string {
+	if a != "" {
+		return a
+	}
+	return b
+}
+
+func collectionsCmd(g *globalFlags) *cobra.Command {
+	return &cobra.Command{
+		Use:   "collections",
+		Short: "List the collections your key may read, and which it may add to",
+		Args:  cobra.NoArgs,
+		RunE: func(cmd *cobra.Command, _ []string) error {
+			c, err := client(g)
+			if err != nil {
+				return err
+			}
+			cs, err := c.Collections(cmd.Context())
+			if err != nil {
+				return err
+			}
+			if len(cs) == 0 {
+				fmt.Fprintln(cmd.OutOrStdout(), "No collections. An administrator creates them and grants access (llmgw ctl kb).")
+				return nil
+			}
+			tw := tabwriter.NewWriter(cmd.OutOrStdout(), 2, 4, 2, ' ', 0)
+			fmt.Fprintln(tw, "NAME\tACCESS\tOWNER\tEMBEDDED BY")
+			for _, x := range cs {
+				access := "read"
+				if x.Writable {
+					access = "read, write"
+				}
+				fmt.Fprintf(tw, "%s\t%s\t%s\t%s (%d)\n", x.Name, access, or(x.OwnerName, x.Owner), x.EmbedModel, x.Dims)
+			}
+			return tw.Flush()
+		},
+	}
+}
+
+func syncCmd(g *globalFlags) *cobra.Command {
+	var o kbsync.Options
+	var verbose bool
+	var ocr string
+	var maxMiB int64
+	cmd := &cobra.Command{
+		Use:   "sync COLLECTION PATH...",
+		Short: "Send a collection what changed in these folders and files",
+		Long: `Reads the files under each PATH that the collection does not already have as
+they are, and sends their text and vectors. Run it again whenever you like;
+unchanged files are not even read.
+
+Documents are named by their path under PATH, with forward slashes; with
+several PATHs, each folder's own name comes first.
+
+  --dry-run   reads and cuts everything, sends nothing, and says what would
+              leave this machine
+  --delete    removes documents this machine sent whose files are gone
+              (only under these PATHs; nothing anybody else sent)
+  --retry     reads again files skipped before (after installing LibreOffice
+              or Tesseract, say)
+
+Without --include, every file of a known format is read (llmgw-kb formats);
+hidden files, version control folders and Office lock files are not.`,
+		Args: cobra.MinimumNArgs(2),
+		RunE: func(cmd *cobra.Command, args []string) error {
+			c, err := client(g)
+			if err != nil {
+				return err
+			}
+			ctx, stop := signal.NotifyContext(cmd.Context(), os.Interrupt)
+			defer stop()
+			l, err := g.openLedger(ctx)
+			if err != nil {
+				return err
+			}
+			defer l.Close()
+			o.Collection, o.Roots = args[0], args[1:]
+			o.Extract = extract.Options{Helpers: extract.FindHelpers(), OCRLanguages: ocr, MaxBytes: maxMiB << 20}
+			out := cmd.OutOrStdout()
+			c.Waiting = func(why string, d time.Duration) {
+				fmt.Fprintf(out, "  ..       waiting %s: %s\n", d, why)
+			}
+			start := time.Now()
+			rep, err := kbsync.Sync(ctx, c, l, o, func(e kbsync.Event) {
+				switch e.Kind {
+				case "unchanged":
+					if !verbose {
+						return
+					}
+					fmt.Fprintf(out, "  =        %s\n", e.Name)
+				case "sent", "would-send":
+					fmt.Fprintf(out, "  %-8s %s (%d chunks, %s)\n", label(e.Kind), e.Name, e.Chunks, size(e.Bytes))
+				default:
+					line := fmt.Sprintf("  %-8s %s", label(e.Kind), e.Name)
+					if e.Detail != "" {
+						line += ": " + e.Detail
+					}
+					fmt.Fprintln(out, line)
+				}
+			})
+			if rep.Collection.Name != "" {
+				verb := "sent"
+				if o.DryRun {
+					verb = "would send"
+				}
+				fmt.Fprintf(out, "\n%s: %d files; %s %d (%d chunks, %s), %d unchanged, %d skipped, %d failed, %d deleted, in %s\n",
+					rep.Collection.Name, rep.Files, verb, rep.Sent, rep.Chunks, size(rep.Bytes), rep.Unchanged,
+					rep.Skipped, rep.Failed, rep.Deleted, time.Since(start).Round(time.Second))
+			}
+			if err != nil {
+				return err
+			}
+			if rep.Failed > 0 {
+				return fmt.Errorf("%d document(s) failed; run again to retry them", rep.Failed)
+			}
+			return nil
+		},
+	}
+	f := cmd.Flags()
+	f.StringSliceVar(&o.Include, "include", nil, "read only files matching these globs (\"*.pdf,docs/**/*.md\")")
+	f.StringSliceVar(&o.Exclude, "exclude", nil, "never read files matching these globs")
+	f.BoolVar(&o.Hidden, "hidden", false, "read hidden files and folders too")
+	f.BoolVar(&o.DryRun, "dry-run", false, "send nothing; say what would be sent")
+	f.BoolVar(&o.Delete, "delete", false, "remove documents this machine sent whose files are gone")
+	f.BoolVar(&o.Retry, "retry", false, "read again files skipped before")
+	f.IntVar(&o.Workers, "workers", 4, "files read and sent at once")
+	f.StringVar(&ocr, "ocr-languages", "tur+eng", "Tesseract's languages for images and scanned pages")
+	f.Int64Var(&maxMiB, "max-size", 256, "skip files larger than this many MiB")
+	f.BoolVarP(&verbose, "verbose", "v", false, "list unchanged files too")
+	return cmd
+}
+
+func label(kind string) string {
+	switch kind {
+	case "would-send":
+		return "send"
+	case "would-delete":
+		return "delete"
+	}
+	return kind
+}
+
+func size(b int64) string {
+	switch {
+	case b >= 1<<20:
+		return fmt.Sprintf("%.1f MiB", float64(b)/(1<<20))
+	case b >= 1<<10:
+		return fmt.Sprintf("%.0f KiB", float64(b)/(1<<10))
+	}
+	return fmt.Sprintf("%d B", b)
+}
+
+func statusCmd(g *globalFlags) *cobra.Command {
+	var all bool
+	return &cobra.Command{
+		Use:   "status COLLECTION",
+		Short: "Show what this machine has sent to a collection, and what it skipped",
+		Args:  cobra.ExactArgs(1),
+		RunE: func(cmd *cobra.Command, args []string) error {
+			c, err := client(g)
+			if err != nil {
+				return err
+			}
+			m, err := c.Manifest(cmd.Context(), args[0])
+			if err != nil {
+				return err
+			}
+			l, err := g.openLedger(cmd.Context())
+			if err != nil {
+				return err
+			}
+			defer l.Close()
+			es, err := l.Entries(cmd.Context(), strings.TrimRight(c.Base, "/"), m.Collection.ID)
+			if err != nil {
+				return err
+			}
+			counts := map[kbsync.State]int{}
+			tw := tabwriter.NewWriter(cmd.OutOrStdout(), 2, 4, 2, ' ', 0)
+			fmt.Fprintln(tw, "STATE\tDOCUMENT\tCHUNKS\tWHEN\tWHY")
+			for _, e := range es {
+				counts[e.State]++
+				if e.State == kbsync.Sent && !all {
+					continue
+				}
+				fmt.Fprintf(tw, "%s\t%s\t%d\t%s\t%s\n", e.State, e.Name, e.Chunks, e.At.Format("2006-01-02 15:04"), e.Reason)
+			}
+			_ = tw.Flush()
+			fmt.Fprintf(cmd.OutOrStdout(), "\n%s holds %d documents; from this machine %d sent, %d skipped, %d failed.",
+				m.Collection.Name, len(m.Documents), counts[kbsync.Sent], counts[kbsync.Skipped], counts[kbsync.Failed])
+			if !all {
+				fmt.Fprint(cmd.OutOrStdout(), " (--all lists the sent ones too)")
+			}
+			fmt.Fprintln(cmd.OutOrStdout())
+			return nil
+		},
+	}
+}
+
+func historyCmd(g *globalFlags) *cobra.Command {
+	return &cobra.Command{
+		Use:   "history",
+		Short: "List the latest syncs from this machine",
+		Args:  cobra.NoArgs,
+		RunE: func(cmd *cobra.Command, _ []string) error {
+			l, err := g.openLedger(cmd.Context())
+			if err != nil {
+				return err
+			}
+			defer l.Close()
+			runs, err := l.Runs(cmd.Context(), 20)
+			if err != nil {
+				return err
+			}
+			tw := tabwriter.NewWriter(cmd.OutOrStdout(), 2, 4, 2, ' ', 0)
+			fmt.Fprintln(tw, "STARTED\tTOOK\tCOLLECTION\tSENT\tUNCHANGED\tSKIPPED\tFAILED\tDELETED")
+			for _, r := range runs {
+				took := "unfinished"
+				if !r.Finished.IsZero() {
+					took = r.Finished.Sub(r.Started).Round(time.Second).String()
+				}
+				fmt.Fprintf(tw, "%s\t%s\t%s\t%d\t%d\t%d\t%d\t%d\n", r.Started.Format("2006-01-02 15:04"), took,
+					r.Collection, r.Sent, r.Unchanged, r.Skipped, r.Failed, r.Delete)
+			}
+			return tw.Flush()
+		},
+	}
+}
+
+func formatsCmd() *cobra.Command {
+	return &cobra.Command{
+		Use:   "formats",
+		Short: "List the formats read, and the helpers found on this machine",
+		Args:  cobra.NoArgs,
+		RunE: func(cmd *cobra.Command, _ []string) error {
+			builtIn, helper := extract.Supported()
+			out := cmd.OutOrStdout()
+			fmt.Fprintf(out, "Read here:\n%s\n\n", wrap(builtIn))
+			fmt.Fprintf(out, "Read with a helper program:\n%s\n\n", wrap(helper))
+			fmt.Fprintln(out, "Helpers:")
+			for _, l := range extract.FindHelpers().Describe() {
+				fmt.Fprintln(out, "  "+l)
+			}
+			return nil
+		},
+	}
+}
+
+func wrap(words []string) string {
+	var b strings.Builder
+	line := "  "
+	for _, w := range words {
+		if len(line)+len(w) > 78 {
+			b.WriteString(strings.TrimRight(line, " ") + "\n")
+			line = "  "
+		}
+		line += w + " "
+	}
+	b.WriteString(strings.TrimRight(line, " "))
+	return b.String()
+}

cmd/llmgw-kb/main_test.go

@@ -0,0 +1,24 @@
+package main
+
+import (
+	"os/exec"
+	"strings"
+	"testing"
+)
+
+// The client goes onto employees' laptops: none of the server, agent, store
+// or setup code may come with it, and it must build where llmgw does not.
+func TestTheClientCarriesNoServerCode(t *testing.T) {
+	out, err := exec.Command("go", "list", "-deps", ".").Output()
+	if err != nil {
+		t.Skipf("go list: %v", err)
+	}
+	for _, dep := range strings.Fields(string(out)) {
+		for _, banned := range []string{"/internal/store", "/internal/router", "/internal/agent", "/internal/control",
+			"/internal/cli", "/internal/guard", "github.com/jackc/pgx"} {
+			if strings.Contains(dep, banned) {
+				t.Errorf("llmgw-kb depends on %s", dep)
+			}
+		}
+	}
+}

cmd/llmgw/main.go

@@ -5,6 +5,8 @@ package main
 import (
 	"fmt"
 	"os"
+	// Time zones for scaling schedules, on a machine without the tz database.
+	_ "time/tzdata"
 
 	"gitea.mynodes.xyz/ilker/llmgw/internal/cli"
 )

deploy/container/Dockerfile

@@ -0,0 +1,40 @@
+# The llmgw control plane as a container image, for deploy/helm/llmgw.
+#
+# The project publishes binaries, not an image, so this is built where the
+# image is to live:
+#
+#   docker build -f deploy/container/Dockerfile --build-arg VERSION=v0.11.1 \
+#     -t registry.internal/llmgw:v0.11.1 .
+#   docker push registry.internal/llmgw:v0.11.1
+#
+# The binary is static (CGO_ENABLED=0, as every release is), so the image is
+# that one file on a base with nothing else in it: no shell, no package
+# manager. `kubectl exec ... -- llmgw ctl status` still works, because it
+# runs the binary rather than a shell.
+#
+# Only the control plane runs from it. An agent installs engines on its
+# machine, manages its GPUs and supervises processes there as root, which is
+# what a container is built to prevent: docs/kubernetes.md.
+
+FROM golang:1.26 AS build
+WORKDIR /src
+COPY go.mod go.sum ./
+RUN go mod download
+COPY . .
+ARG VERSION=dev
+RUN CGO_ENABLED=0 go build -trimpath \
+      -ldflags "-s -w -X gitea.mynodes.xyz/ilker/llmgw/internal/version.Version=${VERSION}" \
+      -o /out/llmgw ./cmd/llmgw && \
+    mkdir -p /out/state
+
+FROM gcr.io/distroless/static-debian12:nonroot
+COPY --from=build /out/llmgw /usr/local/bin/llmgw
+# The chart mounts server.yaml, the certificates and the token under
+# /etc/llmgw, and the SQLite store, when it is one, under /var/lib/llmgw —
+# owned by the user the server runs as, so a volume Docker fills from the
+# image is writable without Kubernetes' fsGroup.
+COPY --from=build --chown=65532:65532 /out/state /var/lib/llmgw
+USER 65532:65532
+EXPOSE 8080 7443 9091
+ENTRYPOINT ["/usr/local/bin/llmgw"]
+CMD ["server", "--config", "/etc/llmgw/server.yaml"]

deploy/eval/arithmetic.yaml

@@ -0,0 +1,58 @@
+# Arithmetic a small instruction model gets right: sums, products and a
+# little reading, each answer scored by the last number in it. A quantisation
+# that has gone wrong, or a chat template that no longer matches the
+# weights, shows up here as a falling score long before anyone notices it in
+# conversation.
+#
+#   llmgw ctl eval MODEL --suite arithmetic
+#   llmgw ctl model update MODEL --eval arithmetic --min-score 0.8
+#
+# Copy it into control.eval_dir (/etc/llmgw/eval) to change it; a suite
+# there of the same name replaces this one.
+name: arithmetic
+description: Sums, products and word problems, each scored by the number in its answer.
+threshold: 0.7
+system: You are a careful calculator. Answer with the number only, without words or units.
+max_tokens: 64
+cases:
+  - id: add-small
+    prompt: What is 17 + 25?
+    number: 42
+  - id: add-carry
+    prompt: What is 389 + 476?
+    number: 865
+  - id: subtract
+    prompt: What is 1000 - 357?
+    number: 643
+  - id: subtract-negative
+    prompt: What is 12 - 30?
+    number: -18
+  - id: multiply
+    prompt: What is 12 * 12?
+    number: 144
+  - id: multiply-larger
+    prompt: What is 23 * 17?
+    number: 391
+    weight: 2
+  - id: divide
+    prompt: What is 144 / 6?
+    number: 24
+  - id: decimal
+    prompt: What is 2.5 * 4?
+    number: 10
+  - id: percent
+    prompt: What is 15% of 200?
+    number: 30
+  - id: words-apples
+    prompt: Ana has 7 apples and buys 5 more, then gives 3 away. How many apples does she have?
+    number: 9
+    weight: 2
+  - id: words-time
+    prompt: A train leaves at 14:00 and the trip takes 150 minutes. How many hours does the trip take?
+    number: 2.5
+    tolerance: 0.01
+    weight: 2
+  - id: order-of-operations
+    prompt: What is 2 + 3 * 4?
+    number: 14
+    weight: 2

deploy/eval/json-format.yaml

@@ -0,0 +1,94 @@
+# Following a format: asked for JSON of a given shape, does the model give
+# it — the thing an application parsing its answers depends on, and the
+# first to go when a chat template drifts. Each answer is read as JSON (a
+# code fence or a sentence around it is forgiven) and held to a schema.
+#
+#   llmgw ctl eval MODEL --suite json-format
+#
+# Copy it into control.eval_dir (/etc/llmgw/eval) to change it; a suite
+# there of the same name replaces this one.
+name: json-format
+description: Answers asked for as JSON of a given shape, held to a schema.
+threshold: 0.7
+system: You answer with a single JSON value and nothing else.
+max_tokens: 200
+cases:
+  - id: person
+    prompt: >-
+      Give a JSON object for a person named Ada Lovelace, born in 1815, with the
+      keys "name" (a string) and "born" (a number).
+    json_schema:
+      type: object
+      required: [name, born]
+      properties:
+        name: {type: string, pattern: "Ada"}
+        born: {type: integer, minimum: 1815, maximum: 1815}
+
+  - id: list-of-colours
+    prompt: Give a JSON array of exactly three colour names, as strings.
+    json_schema:
+      type: array
+      minItems: 3
+      maxItems: 3
+      items: {type: string, minLength: 1}
+
+  - id: boolean-answer
+    prompt: >-
+      Is water wet? Answer as a JSON object with one key, "answer", whose
+      value is true or false.
+    json_schema:
+      type: object
+      required: [answer]
+      properties:
+        answer: {type: boolean}
+
+  - id: nested
+    prompt: >-
+      Give a JSON object describing a book: "title" (a string), "author" (an
+      object with "first" and "last", both strings) and "pages" (a whole number
+      above zero). Use any book.
+    json_schema:
+      type: object
+      required: [title, author, pages]
+      properties:
+        title: {type: string, minLength: 1}
+        author:
+          type: object
+          required: [first, last]
+          properties:
+            first: {type: string}
+            last: {type: string}
+        pages: {type: integer, exclusiveMinimum: 0}
+    weight: 2
+
+  - id: enum-choice
+    prompt: >-
+      Classify the sentence "I love this product!" as positive, negative or
+      neutral. Answer as a JSON object {"sentiment": "..."} using one of those
+      three words in lower case.
+    json_schema:
+      type: object
+      required: [sentiment]
+      properties:
+        sentiment: {enum: [positive]}
+    weight: 2
+
+  - id: numbers
+    prompt: 'Give a JSON object {"sum": N} where N is the sum of 4, 5 and 6.'
+    json_schema:
+      type: object
+      required: [sum]
+      properties:
+        sum: {const: 15}
+
+  - id: no-extra-keys
+    prompt: >-
+      Give a JSON object with exactly two keys, "city" and "country", for
+      Paris. No other keys.
+    json_schema:
+      type: object
+      required: [city, country]
+      additionalProperties: false
+      properties:
+        city: {type: string}
+        country: {type: string}

deploy/examples/server.yaml

@@ -17,8 +17,10 @@ agent_listen: ":7443"
 
 # Mutual TLS on the agent port (plan §5.6). With it, a node's identity is taken
 # from its certificate's common name and an agent claiming a different node id
-# is refused. Without it the port is plaintext HTTP/2 and anyone who can reach
-# it can claim to be any node, so it must stay on a trusted network.
+# is refused. Without it the port would be plaintext HTTP/2 and anyone who can
+# reach it could claim to be any node, so the control plane refuses to start
+# unless `agent_insecure: true` is set — and then listens on loopback unless
+# agent_listen names an address. That is for one machine or a test.
 #
 # These certificates come from llmgw's own authority, not a public one: public
 # authorities stopped issuing the clientAuth usage, so no Let's Encrypt
@@ -92,6 +94,11 @@ agent_listen: ":7443"
 #   flush_interval: 200ms
 #   batch_size: 500
 #   buffer_size: 8192
+#
+#   # How long the record of each request is kept (what `ctl request` reads).
+#   # Charts, totals and budgets come from five-minute sums that are kept, so
+#   # this only bounds the table that grows by a row a request. 0 keeps all.
+#   usage_retention: 2160h   # 90 days
 
 router:
   scrape_interval: 2s
@@ -152,6 +159,12 @@ router:
   # back to a client that did not ask for it.
   inject_usage: true
   max_body_bytes: 33554432
+  # Memory for the answers of projects that reuse them (llmgw keys cache),
+  # all together; the least recently used go first. Nothing is reused until a
+  # project turns it on.
+  # cache:
+  #   max_bytes: 134217728     # 128 MB
+  #   max_entry_bytes: 1048576 # 1 MB
 
   timeouts:
     dial: 5s

deploy/ha/README.md

@@ -1,4 +1,4 @@
-# Two control planes
+# More than one control plane
 
 llmgw handles the hard half of this itself: only one control plane places work,
 and agents find whichever one is leading. What it does not do is move client
@@ -37,7 +37,7 @@ nothing in front of the two had moved.
 So something has to. The options, in the order most people should consider
 them:
 
-**A load balancer you already run.** Health-check `/ready` on each control
+**A load balancer you already run.** Health-check `/leader` on each control
 plane and send traffic to whichever answers. This is the right answer if you
 have one, and it needs nothing else from this directory.
 
@@ -50,25 +50,50 @@ in whatever your resolvers actually honour rather than what you set, which on
 a bad day is minutes. Fine for a cluster people use interactively, wrong for
 one an agent is driving.
 
-## Check `/ready`, not `/health`
+## Check `/leader`, not `/health`
 
 This is the one thing to get right, and the obvious choice is the wrong one.
 
-`/health` says the process is up. It says nothing about whether it can serve,
+`/health` says the process is up. It says nothing about whether it leads,
 and a standby is exactly that case: alive, answering, and holding no endpoints
 at all — its reconciler placed nothing and it has no agent streams to adopt
-from. A load balancer checking `/health` would send it half the traffic, and
-half the traffic would be a 503.
+from. A standby passes client requests on to the leader, so traffic sent to
+one still works — until the leader is the machine that was lost, and there
+is nobody to pass them to.
+
+`/leader` is 200 on the control plane that leads and 503 on a standby. It is
+what keepalived follows for the floating address, and what a load balancer
+should send traffic by: to the one machine that answers 200.
+
+`/ready` is narrower: 200 only when this process has somewhere to send a
+request, so 503 on a standby and also on a leader with no model running yet.
+Checking it takes the portal and the admin pages away with the models — on a
+new cluster with no node yet, nobody can sign in to add one. Use it to stop
+sending inference only, if your load balancer can tell the paths apart.
 
-`/ready` says this process has somewhere to send a request. It is 503 on a
-standby, 503 on a leader whose replicas have all failed, and 200 when there is
-something to serve — which is the question a load balancer is actually asking.
 Both are open, because a load balancer has no key.
 
-During a failover neither passes for about the length of the lease handover:
+During a failover nothing passes for about the length of the lease handover:
 three seconds when the leader is stopped cleanly, up to the lease TTL when it
-is not. That gap is real and there is no way to have it both ways — traffic
-cannot go to a control plane that has nothing to route to.
+is not. A proxy that waits that long for a healthy machine rather than
+failing at once (Caddy's `lb_try_duration`) hides it from clients.
+
+**Caddy**, in front of three control planes — the end of
+[deploy/proxy/Caddyfile](../proxy/Caddyfile) has it with the rest of the
+settings:
+
+```
+reverse_proxy 10.0.0.157:8080 10.0.0.158:8080 10.0.0.159:8080 {
+	lb_policy first
+	health_uri /leader
+	health_interval 2s
+	lb_try_duration 15s
+	flush_interval -1
+}
+```
+
+With a floating address the address already follows the leader: give Caddy
+that one address instead.
 
 Not the admin port, for a different reason: it serves pprof, and pprof can
 dump the process heap, where API keys sit in plaintext.
@@ -85,3 +110,63 @@ auth:
 
 See [docs/install.md](../../docs/install.md) for moving an existing
 installation onto PostgreSQL without reissuing every key.
+
+## The store itself: PostgreSQL under Patroni
+
+Two control planes on one PostgreSQL have moved the single point of failure,
+not removed it. Patroni keeps PostgreSQL on two machines, one streaming to the
+other, and promotes the standby when the primary is lost. It keeps its leader
+lock in etcd, and etcd decides only with a majority — so three members, not
+two: two machines that lose sight of each other must not both decide they are
+the primary. The third member can be any machine that is up; it holds a vote,
+not data.
+
+On the reference cluster:
+
+| machine | etcd | PostgreSQL |
+|---|---|---|
+| llmgw-ctl (control plane) | member | — |
+| llmgw-pg01 | member | Patroni |
+| llmgw-ctl02 (second control plane) | member | Patroni |
+
+`llmgw server init --patroni user@host --patroni user@host` sets all of it up
+over ssh and moves the store in — see [install.md](../../docs/install.md).
+It looks before it acts at every step, so it is also how an existing cluster
+is checked: run against one that is up, it changes nothing. What it writes
+is in `etcd.default.example` (one member's `/etc/default/etcd`) and
+`patroni.yml.example` (one node's `/etc/patroni/config.yml`), for anyone
+doing it by hand; passwords are generated into `/root/llmgw-pg` on each
+database machine.
+
+**Give llmgw every member, and ask for the writable one:**
+
+```
+postgres://llmgw:…@10.0.0.149:5432,10.0.0.150:5432/llmgw?sslmode=disable&target_session_attrs=read-write
+```
+
+The driver connects to whichever member accepts writes, and reconnects to the
+new one after a failover. No floating address or HAProxy is needed for that.
+`llmgw server backup` reads the same address and dumps from a standby when
+there is one.
+
+Measured on the reference cluster, with the gateway serving throughout:
+
+- **Planned switchover** (`patronictl switchover`): the control plane logged
+  one failed lease renewal, reconnected to the new primary, and kept its
+  leadership; nothing else noticed.
+- **The primary's machine switched off**: the standby was promoted 24 seconds
+  later — the 30-second TTL in `patroni.yml` — and the control plane rode it
+  out without losing leadership or a replica. Started again, the old primary
+  rejoined as a standby by itself.
+
+**Watching it.** For a store of several hosts the control plane reads the
+cluster from each member's Patroni (port 8008) and publishes
+`llmgw_store_member{member,host,role,state}`, `llmgw_store_replica_lag_bytes`
+and `llmgw_store_patroni_up`; a host of the address that the cluster no longer
+lists is a member in state `missing`. `llmgw ctl status` prints it as one
+line, and `deploy/monitoring/llmgw-rules.yml` alerts on no leader, a member
+not streaming or missing, and a standby too far behind to be promoted.
+
+Not done here, and worth doing in production: a watchdog (`softdog`) so a
+primary that has lost the lock but not died cannot keep accepting writes, TLS
+on etcd and between PostgreSQL members, and more than one standby.

deploy/ha/etcd.default.example

@@ -0,0 +1,10 @@
+# llmgw: one member of the three that hold Patroni's leader lock (140, 149, 150).
+ETCD_NAME=llmgw-pg01
+ETCD_DATA_DIR=/var/lib/etcd/default
+ETCD_LISTEN_PEER_URLS=http://10.0.0.149:2380
+ETCD_LISTEN_CLIENT_URLS=http://10.0.0.149:2379,http://127.0.0.1:2379
+ETCD_INITIAL_ADVERTISE_PEER_URLS=http://10.0.0.149:2380
+ETCD_ADVERTISE_CLIENT_URLS=http://10.0.0.149:2379
+ETCD_INITIAL_CLUSTER=llmgw-ctl=http://10.0.0.140:2380,llmgw-pg01=http://10.0.0.149:2380,llmgw-ctl02=http://10.0.0.150:2380
+ETCD_INITIAL_CLUSTER_STATE=new
+ETCD_INITIAL_CLUSTER_TOKEN=llmgw-patroni

deploy/ha/keepalived.conf.example

@@ -41,7 +41,9 @@ vrrp_instance llmgw {
     # MASTER on the machine you would rather serve; BACKUP on the other.
     state MASTER
     interface eth0
-    # Any number both machines agree on and nothing else on the segment uses.
+    # Any number both machines agree on and nothing else on the segment uses:
+    # another cluster's keepalived with the same one reads as an invalid
+    # password. `llmgw server add --vip` derives one from the address.
     virtual_router_id 51
     # The higher one wins while both are healthy. The weight above is enough
     # to invert this when the preferred machine's gateway is not answering.

deploy/ha/patroni.yml.example

@@ -0,0 +1,68 @@
+# llmgw: the control planes' store, kept by Patroni on llmgw-pg01 and
+# llmgw-ctl02, with the leader lock in etcd on 140, 149 and 150.
+scope: llmgw
+namespace: /service/
+name: llmgw-pg01
+
+restapi:
+  listen: 10.0.0.149:8008
+  connect_address: 10.0.0.149:8008
+
+etcd3:
+  hosts: 10.0.0.140:2379,10.0.0.149:2379,10.0.0.150:2379
+
+bootstrap:
+  dcs:
+    ttl: 30
+    loop_wait: 10
+    retry_timeout: 10
+    maximum_lag_on_failover: 1048576
+    postgresql:
+      use_pg_rewind: true
+      use_slots: true
+      parameters:
+        wal_level: replica
+        hot_standby: "on"
+        max_wal_senders: 10
+        max_replication_slots: 10
+        wal_keep_size: 1GB
+        wal_log_hints: "on"
+        password_encryption: scram-sha-256
+  initdb:
+    - encoding: UTF8
+    - data-checksums
+
+postgresql:
+  listen: 127.0.0.1,10.0.0.149:5432
+  connect_address: 10.0.0.149:5432
+  data_dir: /var/lib/postgresql/16/llmgw
+  bin_dir: /usr/lib/postgresql/16/bin
+  pgpass: /var/lib/postgresql/.pgpass_patroni
+  authentication:
+    superuser:
+      username: postgres
+      password: "<from /root/llmgw-pg>"
+    replication:
+      username: replicator
+      password: "<from /root/llmgw-pg>"
+    rewind:
+      username: postgres
+      password: "<from /root/llmgw-pg>"
+  parameters:
+    unix_socket_directories: /var/run/postgresql
+  pg_hba:
+    - local all all peer
+    - host all all 127.0.0.1/32 scram-sha-256
+    - host replication replicator 10.0.0.149/32 scram-sha-256
+    - host replication replicator 10.0.0.150/32 scram-sha-256
+    - host all postgres 10.0.0.149/32 scram-sha-256
+    - host all postgres 10.0.0.150/32 scram-sha-256
+    - host llmgw llmgw 10.0.0.140/32 scram-sha-256
+    - host llmgw llmgw 10.0.0.149/32 scram-sha-256
+    - host llmgw llmgw 10.0.0.150/32 scram-sha-256
+
+tags:
+  nofailover: false
+  noloadbalance: false
+  clonefrom: false
+  nosync: false

deploy/helm/llmgw/Chart.yaml

@@ -0,0 +1,17 @@
+apiVersion: v2
+name: llmgw
+description: >-
+  The llmgw control plane — the OpenAI-compatible gateway, the router and the
+  scheduler that places models on GPU and CPU nodes. The nodes themselves run
+  outside Kubernetes; see docs/kubernetes.md.
+type: application
+# The chart's own version; appVersion is the llmgw release the image holds.
+version: 0.1.0
+appVersion: "v0.11.1"
+home: https://gitea.mynodes.xyz/ilker/llmgw
+sources:
+  - https://gitea.mynodes.xyz/ilker/llmgw
+keywords:
+  - llm
+  - gateway
+  - inference

deploy/helm/llmgw/templates/NOTES.txt

@@ -0,0 +1,27 @@
+The llmgw control plane is starting as {{ include "llmgw.fullname" . }}.
+
+The admin API listens on the pod's loopback only. To reach it from here:
+
+  kubectl -n {{ .Release.Namespace }} port-forward statefulset/{{ include "llmgw.fullname" . }} 9090:9090 &
+  export LLMGW_ADMIN_TOKEN=$(kubectl -n {{ .Release.Namespace }} get secret {{ include "llmgw.adminSecret" . }} \
+    -o jsonpath='{.data.{{ if .Values.adminToken.existingSecret }}{{ .Values.adminToken.secretKey }}{{ else }}admin-token{{ end }}}' | base64 -d)
+  llmgw ctl status
+
+The first administrator:
+
+  kubectl -n {{ .Release.Namespace }} exec -it statefulset/{{ include "llmgw.fullname" . }} -- \
+    llmgw users create you@example.com --password '<a password>'
+  kubectl -n {{ .Release.Namespace }} exec -it statefulset/{{ include "llmgw.fullname" . }} -- \
+    llmgw users role you@example.com admin
+
+Agents connect to the {{ include "llmgw.fullname" . }}-agents Service on port {{ .Values.agentService.port }}:
+
+  kubectl -n {{ .Release.Namespace }} get service {{ include "llmgw.fullname" . }}-agents
+
+Its address must be in the certificate in {{ .Values.agentTLS.existingSecret }}. Nodes join from
+the machine holding llmgw's authority:
+
+  sudo llmgw node add ubuntu@gpu01 --server https://<that address>:{{ .Values.agentService.port }} \
+    --pki ./pki --admin 127.0.0.1:9090
+
+docs/kubernetes.md has the rest, and why the nodes stay outside Kubernetes.

deploy/helm/llmgw/templates/_helpers.tpl

@@ -0,0 +1,74 @@
+{{/* The release's name for everything the chart makes. */}}
+{{- define "llmgw.fullname" -}}
+{{- if contains .Chart.Name .Release.Name -}}
+{{- .Release.Name | trunc 63 | trimSuffix "-" -}}
+{{- else -}}
+{{- printf "%s-%s" .Release.Name .Chart.Name | trunc 63 | trimSuffix "-" -}}
+{{- end -}}
+{{- end -}}
+
+{{- define "llmgw.selectorLabels" -}}
+app.kubernetes.io/name: {{ .Chart.Name }}
+app.kubernetes.io/instance: {{ .Release.Name }}
+{{- end -}}
+
+{{- define "llmgw.labels" -}}
+{{ include "llmgw.selectorLabels" . }}
+app.kubernetes.io/version: {{ .Values.image.tag | default .Chart.AppVersion | quote }}
+app.kubernetes.io/managed-by: {{ .Release.Service }}
+helm.sh/chart: {{ printf "%s-%s" .Chart.Name .Chart.Version | replace "+" "_" }}
+{{- end -}}
+
+{{- define "llmgw.image" -}}
+{{- if not .Values.image.repository -}}
+{{- fail "image.repository: the image built from deploy/container/Dockerfile, pushed where the cluster can pull it (the project publishes binaries, not an image)" -}}
+{{- end -}}
+{{- printf "%s:%s" .Values.image.repository (.Values.image.tag | default .Chart.AppVersion) -}}
+{{- end -}}
+
+{{- define "llmgw.adminSecret" -}}
+{{- .Values.adminToken.existingSecret | default (printf "%s-admin" (include "llmgw.fullname" .)) -}}
+{{- end -}}
+
+{{/*
+server.yaml: what the chart decides — listeners, where the certificates,
+the token and the store are mounted — laid over .Values.config. The chart's
+keys win, because each names a port or a path the pod is built around.
+*/}}
+{{- define "llmgw.serverConfig" -}}
+{{- $store := "/var/lib/llmgw/llmgw.db" -}}
+{{- if eq .Values.store.type "postgres" -}}
+{{- $store = "@/etc/llmgw/store/dsn" -}}
+{{- end -}}
+{{- $base := dict
+  "listen" ":8080"
+  "admin_listen" "127.0.0.1:9090"
+  "metrics_listen" ":9091"
+  "agent_listen" ":7443"
+  "admin_token_file" "/etc/llmgw/admin/admin-token"
+  "agent_tls" (dict "ca" "/etc/llmgw/tls/ca.pem" "cert" "/etc/llmgw/tls/server.pem" "key" "/etc/llmgw/tls/server-key.pem")
+  "auth" (dict "store" $store)
+-}}
+{{- if .Values.offlineChecksums.configMap -}}
+{{- $_ := set $base "offline" (dict "checksums" "/etc/llmgw/offline/offline.sha256") -}}
+{{- end -}}
+{{- $cfg := mustMergeOverwrite (deepCopy (.Values.config | default dict)) $base -}}
+# Made by the llmgw Helm chart from its values. Every key: docs/reference.md
+{{ toYaml $cfg }}
+{{- end -}}
+
+{{/* Refuses values that would make a pod that cannot work. */}}
+{{- define "llmgw.validate" -}}
+{{- if not (has .Values.store.type (list "sqlite" "postgres")) -}}
+{{- fail (printf "store.type %q: sqlite or postgres" .Values.store.type) -}}
+{{- end -}}
+{{- if ne (int .Values.replicas) 1 -}}
+{{- fail "replicas: this chart runs one control plane; values.yaml says why" -}}
+{{- end -}}
+{{- if and (eq .Values.store.type "postgres") (not .Values.store.postgres.existingSecret) -}}
+{{- fail "store.postgres.existingSecret: a Secret holding the PostgreSQL address" -}}
+{{- end -}}
+{{- if not .Values.agentTLS.existingSecret -}}
+{{- fail "agentTLS.existingSecret: a Secret with ca.pem, server.pem and server-key.pem from llmgw's authority (see values.yaml)" -}}
+{{- end -}}
+{{- end -}}

deploy/helm/llmgw/templates/configmap.yaml

@@ -0,0 +1,10 @@
+{{- include "llmgw.validate" . -}}
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: {{ include "llmgw.fullname" . }}
+  labels:
+    {{- include "llmgw.labels" . | nindent 4 }}
+data:
+  server.yaml: |
+    {{- include "llmgw.serverConfig" . | nindent 4 }}

deploy/helm/llmgw/templates/ingress.yaml

@@ -0,0 +1,37 @@
+{{- if .Values.ingress.enabled }}
+# The OpenAI-compatible API, the portal and the chat page on port 8080. Never
+# the agent port: its mutual TLS cannot pass through an HTTP proxy.
+apiVersion: networking.k8s.io/v1
+kind: Ingress
+metadata:
+  name: {{ include "llmgw.fullname" . }}
+  labels:
+    {{- include "llmgw.labels" . | nindent 4 }}
+  {{- with .Values.ingress.annotations }}
+  annotations:
+    {{- toYaml . | nindent 4 }}
+  {{- end }}
+spec:
+  {{- with .Values.ingress.className }}
+  ingressClassName: {{ . }}
+  {{- end }}
+  {{- with .Values.ingress.tls }}
+  tls:
+    {{- toYaml . | nindent 4 }}
+  {{- end }}
+  rules:
+    {{- range .Values.ingress.hosts }}
+    - host: {{ .host | quote }}
+      http:
+        paths:
+          {{- range .paths }}
+          - path: {{ .path }}
+            pathType: {{ .pathType }}
+            backend:
+              service:
+                name: {{ include "llmgw.fullname" $ }}
+                port:
+                  name: api
+          {{- end }}
+    {{- end }}
+{{- end }}

deploy/helm/llmgw/templates/secret-admin.yaml

@@ -0,0 +1,19 @@
+{{- if not .Values.adminToken.existingSecret }}
+{{- $name := include "llmgw.adminSecret" . }}
+{{- $token := randAlphaNum 64 }}
+{{- /* Kept across upgrades: a new token on every upgrade would lock out every console holding the old one. */}}
+{{- with lookup "v1" "Secret" .Release.Namespace $name }}
+{{- $token = index .data "admin-token" | b64dec }}
+{{- end }}
+apiVersion: v1
+kind: Secret
+metadata:
+  name: {{ $name }}
+  labels:
+    {{- include "llmgw.labels" . | nindent 4 }}
+  annotations:
+    helm.sh/resource-policy: keep
+type: Opaque
+data:
+  admin-token: {{ $token | b64enc | quote }}
+{{- end }}

deploy/helm/llmgw/templates/servicemonitor.yaml

@@ -0,0 +1,21 @@
+{{- if .Values.serviceMonitor.enabled }}
+# For the Prometheus Operator: the metrics port, which serves metrics and
+# nothing else. deploy/monitoring holds the rules and dashboards that read them.
+apiVersion: monitoring.coreos.com/v1
+kind: ServiceMonitor
+metadata:
+  name: {{ include "llmgw.fullname" . }}
+  labels:
+    {{- include "llmgw.labels" . | nindent 4 }}
+    {{- with .Values.serviceMonitor.labels }}
+    {{- toYaml . | nindent 4 }}
+    {{- end }}
+spec:
+  selector:
+    matchLabels:
+      {{- include "llmgw.selectorLabels" . | nindent 6 }}
+  endpoints:
+    - port: metrics
+      path: /metrics
+      interval: {{ .Values.serviceMonitor.interval }}
+{{- end }}

deploy/helm/llmgw/templates/services.yaml

@@ -0,0 +1,70 @@
+# The API and the metrics, for the cluster and an Ingress.
+apiVersion: v1
+kind: Service
+metadata:
+  name: {{ include "llmgw.fullname" . }}
+  labels:
+    {{- include "llmgw.labels" . | nindent 4 }}
+  {{- with .Values.service.annotations }}
+  annotations:
+    {{- toYaml . | nindent 4 }}
+  {{- end }}
+spec:
+  type: {{ .Values.service.type }}
+  selector:
+    {{- include "llmgw.selectorLabels" . | nindent 4 }}
+  ports:
+    - name: api
+      port: {{ .Values.service.port }}
+      targetPort: api
+    - name: metrics
+      port: {{ .Values.service.metricsPort }}
+      targetPort: metrics
+---
+# Where agents on the nodes connect. Mutual TLS ends in the pod: whatever is
+# in between must pass TCP through untouched.
+apiVersion: v1
+kind: Service
+metadata:
+  name: {{ include "llmgw.fullname" . }}-agents
+  labels:
+    {{- include "llmgw.labels" . | nindent 4 }}
+  {{- with .Values.agentService.annotations }}
+  annotations:
+    {{- toYaml . | nindent 4 }}
+  {{- end }}
+spec:
+  type: {{ .Values.agentService.type }}
+  {{- if and (eq .Values.agentService.type "LoadBalancer") .Values.agentService.loadBalancerIP }}
+  loadBalancerIP: {{ .Values.agentService.loadBalancerIP }}
+  {{- end }}
+  {{- with .Values.agentService.loadBalancerSourceRanges }}
+  loadBalancerSourceRanges:
+    {{- toYaml . | nindent 4 }}
+  {{- end }}
+  {{- if has .Values.agentService.type (list "LoadBalancer" "NodePort") }}
+  externalTrafficPolicy: {{ .Values.agentService.externalTrafficPolicy }}
+  {{- end }}
+  selector:
+    {{- include "llmgw.selectorLabels" . | nindent 4 }}
+  ports:
+    - name: agents
+      port: {{ .Values.agentService.port }}
+      targetPort: agents
+---
+# The StatefulSet's own, giving each pod a stable name.
+apiVersion: v1
+kind: Service
+metadata:
+  name: {{ include "llmgw.fullname" . }}-headless
+  labels:
+    {{- include "llmgw.labels" . | nindent 4 }}
+spec:
+  clusterIP: None
+  publishNotReadyAddresses: true
+  selector:
+    {{- include "llmgw.selectorLabels" . | nindent 4 }}
+  ports:
+    - name: api
+      port: 8080
+      targetPort: api

deploy/helm/llmgw/templates/statefulset.yaml

@@ -0,0 +1,181 @@
+apiVersion: apps/v1
+kind: StatefulSet
+metadata:
+  name: {{ include "llmgw.fullname" . }}
+  labels:
+    {{- include "llmgw.labels" . | nindent 4 }}
+spec:
+  # One control plane: Kubernetes replaces it within seconds when it goes,
+  # and the agents reconnect on their own. See replicas in values.yaml.
+  replicas: 1
+  serviceName: {{ include "llmgw.fullname" . }}-headless
+  selector:
+    matchLabels:
+      {{- include "llmgw.selectorLabels" . | nindent 6 }}
+  template:
+    metadata:
+      labels:
+        {{- include "llmgw.selectorLabels" . | nindent 8 }}
+        {{- with .Values.podLabels }}
+        {{- toYaml . | nindent 8 }}
+        {{- end }}
+      annotations:
+        # server.yaml is read at start: a changed one restarts the pod.
+        checksum/config: {{ include "llmgw.serverConfig" . | sha256sum }}
+        {{- with .Values.podAnnotations }}
+        {{- toYaml . | nindent 8 }}
+        {{- end }}
+    spec:
+      {{- with .Values.imagePullSecrets }}
+      imagePullSecrets:
+        {{- toYaml . | nindent 8 }}
+      {{- end }}
+      # Agents reconnect within seconds of a control plane going; a long
+      # grace period only delays the one that replaces it.
+      terminationGracePeriodSeconds: 30
+      securityContext:
+        runAsNonRoot: true
+        runAsUser: 65532
+        runAsGroup: 65532
+        fsGroup: 65532
+        seccompProfile:
+          type: RuntimeDefault
+      containers:
+        - name: llmgw
+          image: {{ include "llmgw.image" . }}
+          imagePullPolicy: {{ .Values.image.pullPolicy }}
+          args: ["server", "--config", "/etc/llmgw/server.yaml"]
+          env:
+            # For `kubectl exec ... -- llmgw ctl`, which reads the token
+            # from here; the server reads admin_token_file.
+            - name: LLMGW_ADMIN_TOKEN
+              valueFrom:
+                secretKeyRef:
+                  name: {{ include "llmgw.adminSecret" . }}
+                  key: {{ if .Values.adminToken.existingSecret }}{{ .Values.adminToken.secretKey }}{{ else }}admin-token{{ end }}
+          ports:
+            - name: api
+              containerPort: 8080
+            - name: agents
+              containerPort: 7443
+            - name: metrics
+              containerPort: 9091
+          # Up is /health. Ready is /leader: a control plane holds the
+          # agents' connections and places models only once it leads — on
+          # PostgreSQL, once the lease of the one it replaced has run out. A
+          # cluster with no node yet is still ready: /ready would wait for a
+          # replica, and nodes could then never connect.
+          startupProbe:
+            httpGet: {path: /health, port: api}
+            periodSeconds: 5
+            failureThreshold: 60
+          livenessProbe:
+            httpGet: {path: /health, port: api}
+            periodSeconds: 10
+            failureThreshold: 6
+          readinessProbe:
+            httpGet: {path: /leader, port: api}
+            periodSeconds: 5
+            failureThreshold: 2
+          securityContext:
+            allowPrivilegeEscalation: false
+            readOnlyRootFilesystem: true
+            capabilities:
+              drop: ["ALL"]
+          resources:
+            {{- toYaml .Values.resources | nindent 12 }}
+          volumeMounts:
+            - name: config
+              mountPath: /etc/llmgw/server.yaml
+              subPath: server.yaml
+              readOnly: true
+            - name: agent-tls
+              mountPath: /etc/llmgw/tls
+              readOnly: true
+            - name: admin-token
+              mountPath: /etc/llmgw/admin
+              readOnly: true
+            {{- if eq .Values.store.type "postgres" }}
+            - name: store
+              mountPath: /etc/llmgw/store
+              readOnly: true
+            {{- end }}
+            {{- if .Values.offlineChecksums.configMap }}
+            - name: offline
+              mountPath: /etc/llmgw/offline
+              readOnly: true
+            {{- end }}
+            - name: data
+              mountPath: /var/lib/llmgw
+            - name: tmp
+              mountPath: /tmp
+      volumes:
+        - name: config
+          configMap:
+            name: {{ include "llmgw.fullname" . }}
+        - name: agent-tls
+          secret:
+            secretName: {{ .Values.agentTLS.existingSecret }}
+            defaultMode: 0440
+            items:
+              - {key: ca.pem, path: ca.pem}
+              - {key: server.pem, path: server.pem}
+              - {key: server-key.pem, path: server-key.pem}
+        - name: admin-token
+          secret:
+            secretName: {{ include "llmgw.adminSecret" . }}
+            defaultMode: 0440
+            items:
+              - key: {{ if .Values.adminToken.existingSecret }}{{ .Values.adminToken.secretKey }}{{ else }}admin-token{{ end }}
+                path: admin-token
+        {{- if eq .Values.store.type "postgres" }}
+        - name: store
+          secret:
+            secretName: {{ .Values.store.postgres.existingSecret }}
+            defaultMode: 0440
+            items:
+              - key: {{ .Values.store.postgres.secretKey }}
+                path: dsn
+        {{- end }}
+        {{- if .Values.offlineChecksums.configMap }}
+        - name: offline
+          configMap:
+            name: {{ .Values.offlineChecksums.configMap }}
+            items:
+              - key: {{ .Values.offlineChecksums.key }}
+                path: offline.sha256
+        {{- end }}
+        - name: tmp
+          emptyDir: {}
+        {{- if eq .Values.store.type "postgres" }}
+        # The store is PostgreSQL; nothing here outlives the pod.
+        - name: data
+          emptyDir: {}
+        {{- end }}
+      {{- with .Values.nodeSelector }}
+      nodeSelector:
+        {{- toYaml . | nindent 8 }}
+      {{- end }}
+      {{- with .Values.tolerations }}
+      tolerations:
+        {{- toYaml . | nindent 8 }}
+      {{- end }}
+      {{- with .Values.affinity }}
+      affinity:
+        {{- toYaml . | nindent 8 }}
+      {{- end }}
+  {{- if eq .Values.store.type "sqlite" }}
+  volumeClaimTemplates:
+    - metadata:
+        name: data
+        labels:
+          {{- include "llmgw.selectorLabels" . | nindent 10 }}
+      spec:
+        accessModes: ["ReadWriteOnce"]
+        {{- with .Values.store.sqlite.storageClass }}
+        storageClassName: {{ . }}
+        {{- end }}
+        resources:
+          requests:
+            storage: {{ .Values.store.sqlite.size }}
+  {{- end }}

deploy/helm/llmgw/values.yaml

@@ -0,0 +1,132 @@
+# The llmgw control plane in Kubernetes. docs/kubernetes.md says what this
+# runs, what it does not, and how nodes outside the cluster join it.
+
+image:
+  # Where you pushed the image built from deploy/container/Dockerfile. The
+  # project publishes binaries, not an image, so this has no default.
+  repository: ""
+  # Empty takes the chart's appVersion.
+  tag: ""
+  pullPolicy: IfNotPresent
+imagePullSecrets: []
+
+# One control plane, always. Two against PostgreSQL would elect a leader and
+# keep a standby, but a standby serves nothing and is never ready, so a
+# rollout would wait on it for ever. Until the chart handles that, it runs
+# one: Kubernetes replaces it within seconds when it goes, and the agents
+# reconnect on their own.
+replicas: 1
+
+store:
+  # sqlite: a file on a PersistentVolumeClaim, for one replica.
+  # postgres: a PostgreSQL you run, its address in a Secret.
+  type: sqlite
+  sqlite:
+    size: 10Gi
+    storageClass: ""
+  postgres:
+    # A Secret holding the address, postgres://user:password@host:5432/llmgw?sslmode=verify-full
+    existingSecret: ""
+    secretKey: dsn
+
+# The agent port's certificate. It comes from llmgw's own authority, not a
+# public one — agents present certificates from the same authority — so it
+# is made outside the cluster, where the authority's key stays:
+#
+#   llmgw ctl cert init-ca --dir ./pki
+#   llmgw ctl cert issue-server llmgw-ctl --host <agent address> --dir ./pki --out ./pki
+#   kubectl create secret generic llmgw-agent-tls \
+#     --from-file=ca.pem=pki/ca.pem \
+#     --from-file=server.pem=pki/server.pem \
+#     --from-file=server-key.pem=pki/server-key.pem
+#
+# --host is every address agents dial: agentService's load balancer address
+# or DNS name.
+agentTLS:
+  existingSecret: ""
+
+# The admin API's token (llmgw ctl, the console). Empty makes one, kept in a
+# Secret across upgrades.
+adminToken:
+  existingSecret: ""
+  secretKey: admin-token
+
+# server.yaml beyond what the chart sets (listeners, TLS, store, admin
+# token): any key of docs/reference.md, laid over the chart's. An offline
+# cluster sets offline.mirror here, and offlineChecksums below.
+config:
+  control:
+    enabled: true
+  auth:
+    enabled: true
+    signup_open: false
+    default_rpm: 60
+    default_tpm: 200000
+    default_price:
+      prompt_per_1k: 1000
+      completion_per_1k: 1000
+    max_key_ttl: 2160h
+  # mirror:
+  #   api: https://models.internal:8082
+  # offline:
+  #   mirror: http://models.internal:8081
+  # firewall_networks: ["10.42.0.0/16"]   # the pods' network, so nodes' engines answer the router
+
+# On an offline cluster, a ConfigMap or Secret holding the engine checksums
+# 'llmgw bundle trust' writes (offline.sha256), mounted where offline.checksums
+# points. Empty mounts none.
+offlineChecksums:
+  configMap: ""
+  key: offline.sha256
+
+# The OpenAI-compatible API and the metrics, inside the cluster.
+service:
+  type: ClusterIP
+  port: 8080
+  metricsPort: 9091
+  annotations: {}
+
+# Where agents connect, with mutual TLS. Nodes run outside the cluster, so
+# this is a load balancer by default; the TLS ends in the pod, never at a
+# proxy in between.
+agentService:
+  type: LoadBalancer
+  port: 7443
+  annotations: {}
+  loadBalancerIP: ""
+  loadBalancerSourceRanges: []
+  # Keeps the agents' addresses as they are, which the node's identity does
+  # not need but the logs and the audit read better with.
+  externalTrafficPolicy: Local
+
+ingress:
+  enabled: false
+  className: ""
+  annotations: {}
+  hosts:
+    - host: llm.example.com
+      paths:
+        - path: /
+          pathType: Prefix
+  tls: []
+  #  - secretName: llm-example-com
+  #    hosts: [llm.example.com]
+
+# A ServiceMonitor for the Prometheus Operator, scraping the metrics port.
+serviceMonitor:
+  enabled: false
+  interval: 30s
+  labels: {}
+
+resources:
+  requests:
+    cpu: 500m
+    memory: 512Mi
+  limits:
+    memory: 2Gi
+
+nodeSelector: {}
+tolerations: []
+affinity: {}
+podAnnotations: {}
+podLabels: {}

deploy/mirror/README.md

@@ -25,6 +25,13 @@ An HTTP server serving a directory. That is the whole design.
       model.safetensors
 ```
 
+At an offline site the mirror also holds what the nodes would otherwise fetch
+from the internet — llmgw's releases and the llama.cpp builds — under
+`_llmgw/releases/` and `_llmgw/engines/`, put there by `llmgw bundle import`
+(docs/install.md, "Offline sites"). They are not models: `mirror list` and
+`mirror unused` pass over them, and a node checks each against what the
+control plane says it must be, not against anything the mirror says.
+
 The date in the path is the point of the layout, not decoration. A model
 repository that changes upstream changes what you are running, and the first
 sign is a prompt that worked last week answering differently this week with
@@ -65,9 +72,13 @@ hand it certificates:
 llmgw mirror serve --dir /srv/models --base http://models.internal:8081 \
   --tls-ca /etc/llmgw/ca.pem \
   --tls-cert /etc/llmgw/mirror.pem \
-  --tls-key /etc/llmgw/mirror-key.pem
+  --tls-key /etc/llmgw/mirror-key.pem \
+  --api-client control-plane
 ```
 
+`--api-client` is required with `--tls-ca`: it names the one certificate the
+API answers, because the CA signs every node's certificate as well.
+
 That is the same CA the agents already use, so the certificates come from the
 authority you have:
 

deploy/monitoring/README.md

@@ -66,6 +66,8 @@ install -m 0644 grafana/datasource.yaml   /etc/grafana/provisioning/datasources/
 install -m 0644 grafana/dashboards.yaml   /etc/grafana/provisioning/dashboards/llmgw.yaml
 install -m 0644 -o grafana -g grafana grafana/llmgw-overview.json \
     /var/lib/grafana/dashboards/llmgw.json
+install -m 0644 -o grafana -g grafana grafana/llmgw-tenants.json \
+    /var/lib/grafana/dashboards/llmgw-tenants.json
 systemctl restart grafana-server
 ```
 

deploy/monitoring/alertmanager.yml

@@ -1,10 +1,11 @@
 # Alertmanager for the llmgw cluster.
 #
-# Nothing is sent anywhere yet, on purpose. Where an alert should go — an
+# Nothing is sent anywhere until a receiver is chosen, on purpose. Where an alert should go — an
 # address, a Slack workspace, a webhook — is a decision with credentials
 # attached, and a monitoring system that quietly starts mailing people is worse
 # than one that is visibly not wired up. Alerts group and fire here and are
-# visible at :9093 and in Prometheus; add a receiver below to make them travel.
+# visible at :9093 and in Prometheus; uncomment a receiver template below and
+# name it on the route to make them travel.
 global:
   resolve_timeout: 5m
 
@@ -31,6 +32,53 @@ route:
 receivers:
   - name: none
 
+  # Receiver templates. Uncomment one, fill in where it goes, and name it in
+  # `receiver:` above — on the route, the critical branch, or both. Secrets go
+  # in files Alertmanager reads (the *_file settings), mode 0640 owned by
+  # root:prometheus, not in this file. `amtool check-config` before a restart.
+  #
+  # Slack (an incoming webhook):
+  # - name: slack
+  #   slack_configs:
+  #     - api_url_file: /etc/prometheus/slack-webhook-url
+  #       channel: '#llmgw'
+  #       send_resolved: true
+  #       title: '{{ .Status | toUpper }}: {{ .CommonLabels.alertname }}'
+  #       text: >-
+  #         {{ range .Alerts }}{{ .Annotations.summary }}
+  #         {{ .Annotations.description }}
+  #         {{ end }}
+  #
+  # E-mail (through a relay that takes authenticated submission):
+  # - name: email
+  #   email_configs:
+  #     - to: ops@example.com
+  #       from: llmgw-alerts@example.com
+  #       smarthost: smtp.example.com:587
+  #       auth_username: llmgw-alerts@example.com
+  #       auth_password_file: /etc/prometheus/smtp-password
+  #       send_resolved: true
+  #
+  # PagerDuty (Events API v2), for the critical branch — what should wake
+  # someone:
+  # - name: pagerduty
+  #   pagerduty_configs:
+  #     - routing_key_file: /etc/prometheus/pagerduty-routing-key
+  #       severity: '{{ .CommonLabels.severity }}'
+  #       description: '{{ .CommonAnnotations.summary }}'
+  #
+  # A webhook of your own (Alertmanager's JSON, version 4):
+  # - name: webhook
+  #   webhook_configs:
+  #     - url_file: /etc/prometheus/alert-webhook-url
+  #       send_resolved: true
+  #       max_alerts: 20
+  #
+  # The gateway itself also sends a few events straight to webhooks, with no
+  # Prometheus in between — a model parked, a node lost, a budget spent, new
+  # weights published: `notify.webhooks` in server.yaml (docs/install.md,
+  # "Being told").
+
 inhibit_rules:
   # A node that is down explains every replica on it. Reporting both says the
   # same thing twice and buries whichever is the actual cause.

deploy/monitoring/grafana/llmgw-overview.json

@@ -487,6 +487,427 @@
         "defaults": {},
         "overrides": []
       }
+    },
+    {
+      "type": "row",
+      "title": "GPUs",
+      "id": 14,
+      "gridPos": {
+        "x": 0,
+        "y": 30,
+        "w": 24,
+        "h": 1
+      },
+      "collapsed": false,
+      "panels": []
+    },
+    {
+      "type": "timeseries",
+      "title": "GPU busy, by card",
+      "description": "Share of each sample period a kernel was running, sampled every heartbeat.",
+      "datasource": {
+        "type": "prometheus",
+        "uid": "llmgw-prom"
+      },
+      "gridPos": {
+        "x": 0,
+        "y": 31,
+        "w": 12,
+        "h": 7
+      },
+      "id": 15,
+      "targets": [
+        {
+          "expr": "llmgw_gpu_utilization_percent",
+          "legendFormat": "{{node}} gpu {{gpu}}",
+          "refId": "A"
+        }
+      ],
+      "fieldConfig": {
+        "defaults": {
+          "unit": "percent",
+          "min": 0,
+          "max": 100
+        },
+        "overrides": []
+      },
+      "options": {
+        "legend": {
+          "displayMode": "list",
+          "placement": "bottom"
+        },
+        "tooltip": {
+          "mode": "multi"
+        }
+      }
+    },
+    {
+      "type": "timeseries",
+      "title": "GPU memory in use, by card",
+      "description": "Framebuffer in use. Engines reserve most of it at start.",
+      "datasource": {
+        "type": "prometheus",
+        "uid": "llmgw-prom"
+      },
+      "gridPos": {
+        "x": 12,
+        "y": 31,
+        "w": 12,
+        "h": 7
+      },
+      "id": 16,
+      "targets": [
+        {
+          "expr": "llmgw_gpu_memory_used_bytes / llmgw_gpu_memory_total_bytes",
+          "legendFormat": "{{node}} gpu {{gpu}}",
+          "refId": "A"
+        }
+      ],
+      "fieldConfig": {
+        "defaults": {
+          "unit": "percentunit",
+          "min": 0,
+          "max": 1
+        },
+        "overrides": []
+      },
+      "options": {
+        "legend": {
+          "displayMode": "list",
+          "placement": "bottom"
+        },
+        "tooltip": {
+          "mode": "multi"
+        }
+      }
+    },
+    {
+      "type": "timeseries",
+      "title": "GPU memory bandwidth busy, by card",
+      "description": "Decode is bound by memory: high here with compute low is a card waiting on memory.",
+      "datasource": {
+        "type": "prometheus",
+        "uid": "llmgw-prom"
+      },
+      "gridPos": {
+        "x": 0,
+        "y": 38,
+        "w": 12,
+        "h": 7
+      },
+      "id": 17,
+      "targets": [
+        {
+          "expr": "llmgw_gpu_memory_utilization_percent",
+          "legendFormat": "{{node}} gpu {{gpu}}",
+          "refId": "A"
+        }
+      ],
+      "fieldConfig": {
+        "defaults": {
+          "unit": "percent",
+          "min": 0,
+          "max": 100
+        },
+        "overrides": []
+      },
+      "options": {
+        "legend": {
+          "displayMode": "list",
+          "placement": "bottom"
+        },
+        "tooltip": {
+          "mode": "multi"
+        }
+      }
+    },
+    {
+      "type": "timeseries",
+      "title": "GPU temperature",
+      "description": "Throttling usually starts in the high 80s.",
+      "datasource": {
+        "type": "prometheus",
+        "uid": "llmgw-prom"
+      },
+      "gridPos": {
+        "x": 12,
+        "y": 38,
+        "w": 12,
+        "h": 7
+      },
+      "id": 18,
+      "targets": [
+        {
+          "expr": "llmgw_gpu_temperature_celsius",
+          "legendFormat": "{{node}} gpu {{gpu}}",
+          "refId": "A"
+        }
+      ],
+      "fieldConfig": {
+        "defaults": {
+          "unit": "celsius"
+        },
+        "overrides": []
+      },
+      "options": {
+        "legend": {
+          "displayMode": "list",
+          "placement": "bottom"
+        },
+        "tooltip": {
+          "mode": "multi"
+        }
+      }
+    },
+    {
+      "type": "timeseries",
+      "title": "GPU power against its limit",
+      "description": "1 is the enforced limit; a card held there is power-capped.",
+      "datasource": {
+        "type": "prometheus",
+        "uid": "llmgw-prom"
+      },
+      "gridPos": {
+        "x": 0,
+        "y": 45,
+        "w": 12,
+        "h": 7
+      },
+      "id": 19,
+      "targets": [
+        {
+          "expr": "llmgw_gpu_power_watts / llmgw_gpu_power_limit_watts",
+          "legendFormat": "{{node}} gpu {{gpu}}",
+          "refId": "A"
+        }
+      ],
+      "fieldConfig": {
+        "defaults": {
+          "unit": "percentunit",
+          "min": 0,
+          "max": 1.1
+        },
+        "overrides": []
+      },
+      "options": {
+        "legend": {
+          "displayMode": "list",
+          "placement": "bottom"
+        },
+        "tooltip": {
+          "mode": "multi"
+        }
+      }
+    },
+    {
+      "type": "timeseries",
+      "title": "GPU clock",
+      "description": "A clock held low under load is the card throttled; see the next panel for why.",
+      "datasource": {
+        "type": "prometheus",
+        "uid": "llmgw-prom"
+      },
+      "gridPos": {
+        "x": 12,
+        "y": 45,
+        "w": 12,
+        "h": 7
+      },
+      "id": 20,
+      "targets": [
+        {
+          "expr": "llmgw_gpu_sm_clock_mhz",
+          "legendFormat": "{{node}} gpu {{gpu}}",
+          "refId": "A"
+        }
+      ],
+      "fieldConfig": {
+        "defaults": {
+          "unit": "rotmhz"
+        },
+        "overrides": []
+      },
+      "options": {
+        "legend": {
+          "displayMode": "list",
+          "placement": "bottom"
+        },
+        "tooltip": {
+          "mode": "multi"
+        }
+      }
+    },
+    {
+      "type": "timeseries",
+      "title": "What holds GPUs back",
+      "description": "Cards throttled now, by reason, and uncorrected ECC errors since the driver loaded.",
+      "datasource": {
+        "type": "prometheus",
+        "uid": "llmgw-prom"
+      },
+      "gridPos": {
+        "x": 0,
+        "y": 52,
+        "w": 24,
+        "h": 7
+      },
+      "id": 21,
+      "targets": [
+        {
+          "expr": "sum by (reason) (llmgw_gpu_throttled)",
+          "legendFormat": "throttled: {{reason}}",
+          "refId": "A"
+        },
+        {
+          "expr": "sum by (node, gpu) (llmgw_gpu_ecc_errors)",
+          "legendFormat": "ECC errors {{node}} gpu {{gpu}}",
+          "refId": "B"
+        }
+      ],
+      "fieldConfig": {
+        "defaults": {
+          "unit": "short"
+        },
+        "overrides": []
+      },
+      "options": {
+        "legend": {
+          "displayMode": "list",
+          "placement": "bottom"
+        },
+        "tooltip": {
+          "mode": "multi"
+        }
+      }
+    },
+    {
+      "type": "timeseries",
+      "title": "Output tokens/s per GPU, by model",
+      "description": "What each model gets out of each card it holds.",
+      "datasource": {
+        "type": "prometheus",
+        "uid": "llmgw-prom"
+      },
+      "gridPos": {
+        "x": 0,
+        "y": 59,
+        "w": 12,
+        "h": 7
+      },
+      "id": 22,
+      "targets": [
+        {
+          "expr": "sum by (model) (rate(llmgw_tokens_total{direction=\"completion\"}[5m])) / count by (model) (llmgw_gpu_assigned)",
+          "legendFormat": "{{model}}",
+          "refId": "A"
+        }
+      ],
+      "fieldConfig": {
+        "defaults": {
+          "unit": "short"
+        },
+        "overrides": []
+      },
+      "options": {
+        "legend": {
+          "displayMode": "list",
+          "placement": "bottom"
+        },
+        "tooltip": {
+          "mode": "multi"
+        }
+      }
+    },
+    {
+      "type": "timeseries",
+      "title": "Output tokens per watt-hour, by model",
+      "description": "Tokens for the energy the model's cards draw.",
+      "datasource": {
+        "type": "prometheus",
+        "uid": "llmgw-prom"
+      },
+      "gridPos": {
+        "x": 12,
+        "y": 59,
+        "w": 12,
+        "h": 7
+      },
+      "id": 23,
+      "targets": [
+        {
+          "expr": "sum by (model) (rate(llmgw_tokens_total{direction=\"completion\"}[5m])) * 3600 / sum by (model) (llmgw_gpu_power_watts * on (node, gpu) group_left (model) llmgw_gpu_assigned)",
+          "legendFormat": "{{model}}",
+          "refId": "A"
+        }
+      ],
+      "fieldConfig": {
+        "defaults": {
+          "unit": "short"
+        },
+        "overrides": []
+      },
+      "options": {
+        "legend": {
+          "displayMode": "list",
+          "placement": "bottom"
+        },
+        "tooltip": {
+          "mode": "multi"
+        }
+      }
+    },
+    {
+      "type": "timeseries",
+      "title": "GPU wear",
+      "datasource": {
+        "type": "prometheus",
+        "uid": "llmgw-prom"
+      },
+      "id": 24,
+      "description": "What wears cards out: XID errors in the last 15 minutes, memory rows remapped, PCIe retries an hour. Anything above zero here is worth a look on that card's node page.",
+      "gridPos": {
+        "x": 0,
+        "y": 66,
+        "w": 24,
+        "h": 7
+      },
+      "targets": [
+        {
+          "expr": "increase(llmgw_gpu_xid_errors[15m]) > 0",
+          "legendFormat": "XID {{node}} gpu {{gpu}}",
+          "refId": "A"
+        },
+        {
+          "expr": "sum by (node, gpu) (llmgw_gpu_remapped_rows) > 0",
+          "legendFormat": "rows remapped {{node}} gpu {{gpu}}",
+          "refId": "B"
+        },
+        {
+          "expr": "increase(llmgw_gpu_pcie_replays[1h]) > 0",
+          "legendFormat": "PCIe retries/h {{node}} gpu {{gpu}}",
+          "refId": "C"
+        },
+        {
+          "expr": "increase(llmgw_gpu_nvlink_errors[1h]) > 0",
+          "legendFormat": "NVLink {{kind}}/h {{node}} gpu {{gpu}}",
+          "refId": "D"
+        }
+      ],
+      "fieldConfig": {
+        "defaults": {
+          "unit": "short"
+        },
+        "overrides": []
+      },
+      "options": {
+        "legend": {
+          "displayMode": "list",
+          "placement": "bottom"
+        },
+        "tooltip": {
+          "mode": "multi"
+        }
+      }
     }
   ]
 }

deploy/monitoring/grafana/llmgw-tenants.json

@@ -0,0 +1,650 @@
+{
+  "uid": "llmgw-tenants",
+  "title": "llmgw \u2014 tenants",
+  "schemaVersion": 39,
+  "version": 1,
+  "editable": true,
+  "time": {
+    "from": "now-24h",
+    "to": "now"
+  },
+  "refresh": "1m",
+  "tags": [
+    "llmgw"
+  ],
+  "description": "Requests, tokens, failures, refusals and first-token time per tenant \u2014 the level router.tenant_label names \u2014 and every budget's share spent.",
+  "templating": {
+    "list": [
+      {
+        "name": "tenant",
+        "label": "Tenant",
+        "type": "query",
+        "datasource": {
+          "type": "prometheus",
+          "uid": "llmgw-prom"
+        },
+        "query": {
+          "query": "label_values(llmgw_tenant_requests_total, tenant)",
+          "refId": "tenant"
+        },
+        "definition": "label_values(llmgw_tenant_requests_total, tenant)",
+        "multi": true,
+        "includeAll": true,
+        "allValue": ".*",
+        "current": {
+          "text": "All",
+          "value": "$__all"
+        },
+        "refresh": 2,
+        "sort": 1
+      }
+    ]
+  },
+  "panels": [
+    {
+      "id": 1,
+      "title": "Requests a second",
+      "type": "stat",
+      "description": "Across the tenants chosen above.",
+      "gridPos": {
+        "x": 0,
+        "y": 0,
+        "w": 6,
+        "h": 4
+      },
+      "datasource": {
+        "type": "prometheus",
+        "uid": "llmgw-prom"
+      },
+      "targets": [
+        {
+          "refId": "A",
+          "expr": "sum(rate(llmgw_tenant_requests_total{tenant=~\"$tenant\"}[5m]))",
+          "legendFormat": "",
+          "datasource": {
+            "type": "prometheus",
+            "uid": "llmgw-prom"
+          }
+        }
+      ],
+      "fieldConfig": {
+        "defaults": {
+          "unit": "reqps"
+        },
+        "overrides": []
+      },
+      "options": {
+        "reduceOptions": {
+          "calcs": [
+            "lastNotNull"
+          ]
+        },
+        "textMode": "auto",
+        "colorMode": "value"
+      }
+    },
+    {
+      "id": 2,
+      "title": "Failing",
+      "type": "stat",
+      "description": "Requests that failed, not counting refusals by a limit.",
+      "gridPos": {
+        "x": 6,
+        "y": 0,
+        "w": 6,
+        "h": 4
+      },
+      "datasource": {
+        "type": "prometheus",
+        "uid": "llmgw-prom"
+      },
+      "targets": [
+        {
+          "refId": "A",
+          "expr": "sum(rate(llmgw_tenant_requests_total{tenant=~\"$tenant\",outcome=\"error\"}[5m])) / sum(rate(llmgw_tenant_requests_total{tenant=~\"$tenant\"}[5m]))",
+          "legendFormat": "",
+          "datasource": {
+            "type": "prometheus",
+            "uid": "llmgw-prom"
+          }
+        }
+      ],
+      "fieldConfig": {
+        "defaults": {
+          "unit": "percentunit",
+          "thresholds": {
+            "mode": "absolute",
+            "steps": [
+              {
+                "color": "green",
+                "value": null
+              },
+              {
+                "color": "orange",
+                "value": 0.02
+              },
+              {
+                "color": "red",
+                "value": 0.05
+              }
+            ]
+          }
+        },
+        "overrides": []
+      },
+      "options": {
+        "reduceOptions": {
+          "calcs": [
+            "lastNotNull"
+          ]
+        },
+        "textMode": "auto",
+        "colorMode": "value"
+      }
+    },
+    {
+      "id": 3,
+      "title": "Refused by a limit",
+      "type": "stat",
+      "description": "Rate, token and budget limits; 429 to the caller.",
+      "gridPos": {
+        "x": 12,
+        "y": 0,
+        "w": 6,
+        "h": 4
+      },
+      "datasource": {
+        "type": "prometheus",
+        "uid": "llmgw-prom"
+      },
+      "targets": [
+        {
+          "refId": "A",
+          "expr": "sum(rate(llmgw_tenant_requests_total{tenant=~\"$tenant\",outcome=\"limited\"}[5m])) / sum(rate(llmgw_tenant_requests_total{tenant=~\"$tenant\"}[5m]))",
+          "legendFormat": "",
+          "datasource": {
+            "type": "prometheus",
+            "uid": "llmgw-prom"
+          }
+        }
+      ],
+      "fieldConfig": {
+        "defaults": {
+          "unit": "percentunit",
+          "thresholds": {
+            "mode": "absolute",
+            "steps": [
+              {
+                "color": "green",
+                "value": null
+              },
+              {
+                "color": "orange",
+                "value": 0.02
+              },
+              {
+                "color": "red",
+                "value": 0.1
+              }
+            ]
+          }
+        },
+        "overrides": []
+      },
+      "options": {
+        "reduceOptions": {
+          "calcs": [
+            "lastNotNull"
+          ]
+        },
+        "textMode": "auto",
+        "colorMode": "value"
+      }
+    },
+    {
+      "id": 4,
+      "title": "First token, p95",
+      "type": "stat",
+      "description": "What people wait for before anything appears.",
+      "gridPos": {
+        "x": 18,
+        "y": 0,
+        "w": 6,
+        "h": 4
+      },
+      "datasource": {
+        "type": "prometheus",
+        "uid": "llmgw-prom"
+      },
+      "targets": [
+        {
+          "refId": "A",
+          "expr": "histogram_quantile(0.95, sum by (le) (rate(llmgw_tenant_ttft_seconds_bucket{tenant=~\"$tenant\"}[5m])))",
+          "legendFormat": "",
+          "datasource": {
+            "type": "prometheus",
+            "uid": "llmgw-prom"
+          }
+        }
+      ],
+      "fieldConfig": {
+        "defaults": {
+          "unit": "s",
+          "thresholds": {
+            "mode": "absolute",
+            "steps": [
+              {
+                "color": "green",
+                "value": null
+              },
+              {
+                "color": "orange",
+                "value": 3
+              },
+              {
+                "color": "red",
+                "value": 10
+              }
+            ]
+          }
+        },
+        "overrides": []
+      },
+      "options": {
+        "reduceOptions": {
+          "calcs": [
+            "lastNotNull"
+          ]
+        },
+        "textMode": "auto",
+        "colorMode": "value"
+      }
+    },
+    {
+      "id": 5,
+      "title": "Requests by tenant",
+      "type": "timeseries",
+      "description": "Stacked, so the top edge is the whole of it.",
+      "gridPos": {
+        "x": 0,
+        "y": 4,
+        "w": 12,
+        "h": 9
+      },
+      "datasource": {
+        "type": "prometheus",
+        "uid": "llmgw-prom"
+      },
+      "targets": [
+        {
+          "refId": "A",
+          "expr": "sum by (tenant) (rate(llmgw_tenant_requests_total{tenant=~\"$tenant\"}[5m]))",
+          "legendFormat": "{{tenant}}",
+          "datasource": {
+            "type": "prometheus",
+            "uid": "llmgw-prom"
+          }
+        }
+      ],
+      "fieldConfig": {
+        "defaults": {
+          "unit": "reqps",
+          "custom": {
+            "stacking": {
+              "mode": "normal"
+            },
+            "fillOpacity": 30
+          }
+        },
+        "overrides": []
+      },
+      "options": {
+        "legend": {
+          "displayMode": "table",
+          "placement": "right",
+          "calcs": [
+            "mean",
+            "max"
+          ]
+        },
+        "tooltip": {
+          "mode": "multi",
+          "sort": "desc"
+        }
+      }
+    },
+    {
+      "id": 6,
+      "title": "Tokens by tenant",
+      "type": "timeseries",
+      "description": "Prompt and completion together: what was consumed.",
+      "gridPos": {
+        "x": 12,
+        "y": 4,
+        "w": 12,
+        "h": 9
+      },
+      "datasource": {
+        "type": "prometheus",
+        "uid": "llmgw-prom"
+      },
+      "targets": [
+        {
+          "refId": "A",
+          "expr": "sum by (tenant) (rate(llmgw_tenant_tokens_total{tenant=~\"$tenant\"}[5m]))",
+          "legendFormat": "{{tenant}}",
+          "datasource": {
+            "type": "prometheus",
+            "uid": "llmgw-prom"
+          }
+        }
+      ],
+      "fieldConfig": {
+        "defaults": {
+          "unit": "short",
+          "custom": {
+            "stacking": {
+              "mode": "normal"
+            },
+            "fillOpacity": 30
+          }
+        },
+        "overrides": []
+      },
+      "options": {
+        "legend": {
+          "displayMode": "table",
+          "placement": "right",
+          "calcs": [
+            "mean",
+            "max"
+          ]
+        },
+        "tooltip": {
+          "mode": "multi",
+          "sort": "desc"
+        }
+      }
+    },
+    {
+      "id": 7,
+      "title": "Refused by a limit, by tenant",
+      "type": "timeseries",
+      "description": "The share of each tenant's requests a limit turned away.",
+      "gridPos": {
+        "x": 0,
+        "y": 13,
+        "w": 12,
+        "h": 8
+      },
+      "datasource": {
+        "type": "prometheus",
+        "uid": "llmgw-prom"
+      },
+      "targets": [
+        {
+          "refId": "A",
+          "expr": "sum by (tenant) (rate(llmgw_tenant_requests_total{tenant=~\"$tenant\",outcome=\"limited\"}[5m])) / sum by (tenant) (rate(llmgw_tenant_requests_total{tenant=~\"$tenant\"}[5m]))",
+          "legendFormat": "{{tenant}}",
+          "datasource": {
+            "type": "prometheus",
+            "uid": "llmgw-prom"
+          }
+        }
+      ],
+      "fieldConfig": {
+        "defaults": {
+          "unit": "percentunit"
+        },
+        "overrides": []
+      },
+      "options": {
+        "legend": {
+          "displayMode": "table",
+          "placement": "right",
+          "calcs": [
+            "mean",
+            "max"
+          ]
+        },
+        "tooltip": {
+          "mode": "multi",
+          "sort": "desc"
+        }
+      }
+    },
+    {
+      "id": 8,
+      "title": "Failing, by tenant",
+      "type": "timeseries",
+      "description": "One tenant alone failing is usually what it sends; all of them together is a model.",
+      "gridPos": {
+        "x": 12,
+        "y": 13,
+        "w": 12,
+        "h": 8
+      },
+      "datasource": {
+        "type": "prometheus",
+        "uid": "llmgw-prom"
+      },
+      "targets": [
+        {
+          "refId": "A",
+          "expr": "sum by (tenant) (rate(llmgw_tenant_requests_total{tenant=~\"$tenant\",outcome=\"error\"}[5m])) / sum by (tenant) (rate(llmgw_tenant_requests_total{tenant=~\"$tenant\"}[5m]))",
+          "legendFormat": "{{tenant}}",
+          "datasource": {
+            "type": "prometheus",
+            "uid": "llmgw-prom"
+          }
+        }
+      ],
+      "fieldConfig": {
+        "defaults": {
+          "unit": "percentunit"
+        },
+        "overrides": []
+      },
+      "options": {
+        "legend": {
+          "displayMode": "table",
+          "placement": "right",
+          "calcs": [
+            "mean",
+            "max"
+          ]
+        },
+        "tooltip": {
+          "mode": "multi",
+          "sort": "desc"
+        }
+      }
+    },
+    {
+      "id": 9,
+      "title": "First token p95, by tenant",
+      "type": "timeseries",
+      "description": "",
+      "gridPos": {
+        "x": 0,
+        "y": 21,
+        "w": 12,
+        "h": 8
+      },
+      "datasource": {
+        "type": "prometheus",
+        "uid": "llmgw-prom"
+      },
+      "targets": [
+        {
+          "refId": "A",
+          "expr": "histogram_quantile(0.95, sum by (tenant, le) (rate(llmgw_tenant_ttft_seconds_bucket{tenant=~\"$tenant\"}[10m])))",
+          "legendFormat": "{{tenant}}",
+          "datasource": {
+            "type": "prometheus",
+            "uid": "llmgw-prom"
+          }
+        }
+      ],
+      "fieldConfig": {
+        "defaults": {
+          "unit": "s"
+        },
+        "overrides": []
+      },
+      "options": {
+        "legend": {
+          "displayMode": "table",
+          "placement": "right",
+          "calcs": [
+            "mean",
+            "max"
+          ]
+        },
+        "tooltip": {
+          "mode": "multi",
+          "sort": "desc"
+        }
+      }
+    },
+    {
+      "id": 10,
+      "title": "Budgets spent this period",
+      "type": "bargauge",
+      "description": "Every organization, team, project and person with a budget. Requests are refused at 100%.",
+      "gridPos": {
+        "x": 12,
+        "y": 21,
+        "w": 12,
+        "h": 8
+      },
+      "datasource": {
+        "type": "prometheus",
+        "uid": "llmgw-prom"
+      },
+      "targets": [
+        {
+          "refId": "A",
+          "expr": "sort_desc(llmgw_budget_spent_ratio)",
+          "legendFormat": "{{scope}} {{name}} ({{period}})",
+          "datasource": {
+            "type": "prometheus",
+            "uid": "llmgw-prom"
+          }
+        }
+      ],
+      "fieldConfig": {
+        "defaults": {
+          "unit": "percentunit",
+          "min": 0,
+          "max": 1,
+          "thresholds": {
+            "mode": "absolute",
+            "steps": [
+              {
+                "color": "green",
+                "value": null
+              },
+              {
+                "color": "orange",
+                "value": 0.8
+              },
+              {
+                "color": "red",
+                "value": 1
+              }
+            ]
+          }
+        },
+        "overrides": []
+      },
+      "options": {
+        "displayMode": "gradient",
+        "orientation": "horizontal",
+        "reduceOptions": {
+          "calcs": [
+            "lastNotNull"
+          ]
+        },
+        "showUnfilled": true
+      }
+    },
+    {
+      "id": 11,
+      "title": "Who used most, last 24 hours",
+      "type": "table",
+      "description": "Spend in money is on the people page's usage tab, which reads it from the store.",
+      "gridPos": {
+        "x": 0,
+        "y": 29,
+        "w": 24,
+        "h": 8
+      },
+      "datasource": {
+        "type": "prometheus",
+        "uid": "llmgw-prom"
+      },
+      "targets": [
+        {
+          "refId": "A",
+          "expr": "sort_desc(sum by (tenant) (increase(llmgw_tenant_requests_total{tenant=~\"$tenant\"}[24h])))",
+          "legendFormat": "requests",
+          "datasource": {
+            "type": "prometheus",
+            "uid": "llmgw-prom"
+          },
+          "format": "table",
+          "instant": true
+        },
+        {
+          "refId": "B",
+          "expr": "sum by (tenant) (increase(llmgw_tenant_tokens_total{tenant=~\"$tenant\"}[24h]))",
+          "legendFormat": "tokens",
+          "datasource": {
+            "type": "prometheus",
+            "uid": "llmgw-prom"
+          },
+          "format": "table",
+          "instant": true
+        },
+        {
+          "refId": "C",
+          "expr": "sum by (tenant) (increase(llmgw_tenant_requests_total{tenant=~\"$tenant\",outcome=\"limited\"}[24h]))",
+          "legendFormat": "limited",
+          "datasource": {
+            "type": "prometheus",
+            "uid": "llmgw-prom"
+          },
+          "format": "table",
+          "instant": true
+        }
+      ],
+      "fieldConfig": {
+        "defaults": {},
+        "overrides": []
+      },
+      "options": {
+        "showHeader": true
+      },
+      "transformations": [
+        {
+          "id": "merge",
+          "options": {}
+        },
+        {
+          "id": "organize",
+          "options": {
+            "excludeByName": {
+              "Time": true
+            },
+            "renameByName": {
+              "Value #A": "Requests",
+              "Value #B": "Tokens",
+              "Value #C": "Refused by a limit"
+            }
+          }
+        }
+      ]
+    }
+  ]
+}

deploy/monitoring/llmgw-rules.yml

@@ -156,6 +156,18 @@ groups:
             llmgw-backup.service` on the control plane says why the last one
             failed; docs/install.md, "Backing up", says how to set it up.
 
+      - alert: ModelUpdateAvailable
+        expr: llmgw_model_update_available == 1
+        for: 1h
+        labels: { severity: info }
+        annotations:
+          summary: "{{ $labels.repo }} has new weights for {{ $labels.model }}"
+          description: >-
+            The registry repository the model was served from has published
+            different files under the same names. `llmgw ctl model updates`
+            lists what changed; `llmgw ctl model update {{ $labels.model }}`
+            moves it to them, and `llmgw ctl model rollback` goes back.
+
       - alert: PoolSaturated
         expr: llmgw_pool_saturation > 1
         for: 5m
@@ -200,6 +212,94 @@ groups:
             is skipped by placement rather than failing, so this is quiet until
             somebody wonders why a model will not land there.
 
+  - name: llmgw-gpus
+    rules:
+      - alert: GPUThermalThrottling
+        expr: llmgw_gpu_throttled{reason=~"sw_thermal|hw_thermal|hw_slowdown"} == 1
+        for: 10m
+        labels: { severity: warning }
+        annotations:
+          summary: "{{ $labels.node }} GPU {{ $labels.gpu }} is slowed by heat ({{ $labels.reason }})"
+          description: >-
+            Ten minutes held back by temperature: every replica on the card is
+            slower than its measurements say. Usually airflow, a fan, or the
+            room — the node page shows the card's temperature over time.
+
+      - alert: GPUUncorrectedECCErrors
+        expr: llmgw_gpu_ecc_errors > 0
+        for: 1m
+        labels: { severity: critical }
+        annotations:
+          summary: "{{ $labels.node }} GPU {{ $labels.gpu }} has {{ $value }} uncorrected ECC errors"
+          description: >-
+            Uncorrected memory errors since the driver loaded: what runs on the
+            card may be computing on corrupted memory. Drain the node
+            (llmgw ctl drain) and have the card looked at.
+
+      - alert: GPUXidError
+        expr: increase(llmgw_gpu_xid_errors[15m]) > 0
+        for: 0m
+        labels: { severity: warning }
+        annotations:
+          summary: "{{ $labels.node }} GPU {{ $labels.gpu }} logged an XID error"
+          description: >-
+            The driver reported an error on the card (its code is
+            llmgw_gpu_last_xid, and the node page says it in words). 79 is a
+            card fallen off the bus, 48 and 63/64 memory errors, 74 NVLink,
+            94/95 contained and uncontained ECC errors: those need the card
+            looked at. Others are often an engine's own fault, and pass.
+
+      - alert: GPUOutOfSpareRows
+        expr: llmgw_gpu_remap_failure == 1
+        for: 1m
+        labels: { severity: critical }
+        annotations:
+          summary: "{{ $labels.node }} GPU {{ $labels.gpu }} has no spare memory rows left"
+          description: >-
+            The card cannot remap another failing row. Drain the node and
+            have the card replaced.
+
+      - alert: GPUNeedsReset
+        expr: llmgw_gpu_remap_pending == 1 or llmgw_gpu_retirement_pending == 1
+        for: 5m
+        labels: { severity: warning }
+        annotations:
+          summary: "{{ $labels.node }} GPU {{ $labels.gpu }} has memory repairs waiting for a reset"
+          description: >-
+            Rows remapped or pages retired take effect only after the card is
+            reset. Drain the node (llmgw ctl drain), reset or reboot, and bring
+            it back.
+
+      - alert: GPUPCIeRetriesClimbing
+        expr: increase(llmgw_gpu_pcie_replays[1h]) > 100
+        for: 0m
+        labels: { severity: warning }
+        annotations:
+          summary: "{{ $labels.node }} GPU {{ $labels.gpu }}: {{ $value }} PCIe retries in an hour"
+          description: >-
+            The card's link to the host is retrying. A riser, the slot or a
+            cable is the usual cause, and transfers to the card slow down.
+
+      - alert: GPUNVLinkErrorsClimbing
+        expr: increase(llmgw_gpu_nvlink_errors{kind="crc"}[1h]) > 10
+        for: 0m
+        labels: { severity: warning }
+        annotations:
+          summary: "{{ $labels.node }} GPU {{ $labels.gpu }}: NVLink CRC errors climbing"
+          description: >-
+            Errors on the card's NVLink links: tensor-parallel replicas on it
+            slow down, and a link that keeps failing takes a replica with it.
+
+      - alert: GPUHot
+        expr: llmgw_gpu_temperature_celsius > 87
+        for: 10m
+        labels: { severity: warning }
+        annotations:
+          summary: "{{ $labels.node }} GPU {{ $labels.gpu }} at {{ $value }} °C"
+          description: >-
+            Ten minutes above 87 °C, where most data-centre cards begin to
+            throttle.
+
   - name: monitoring-host
     rules:
       - alert: MonitoringDiskFilling
@@ -262,3 +362,225 @@ groups:
             Working as designed when the cluster is full: the lowest band is
             held first. Worth knowing about because the callers being refused
             do not know why.
+
+  # Per tenant: the level router.tenant_label names (a team by default), and
+  # every organization, team, project and person given a budget.
+  - name: llmgw-tenants
+    rules:
+      - alert: BudgetMostlySpent
+        expr: llmgw_budget_spent_ratio >= 0.8 and llmgw_budget_spent_ratio < 1
+        for: 5m
+        labels: { severity: warning }
+        annotations:
+          summary: "{{ $labels.scope }} {{ $labels.name }} has spent {{ $value | humanizePercentage }} of its {{ $labels.period }}ly budget"
+          description: >-
+            Its requests are refused once it reaches all of it, until the
+            period turns. Raise it on the people page, or tell them now
+            rather than when they are refused.
+
+      - alert: BudgetSpent
+        expr: llmgw_budget_spent_ratio >= 1
+        for: 1m
+        labels: { severity: critical }
+        annotations:
+          summary: "{{ $labels.scope }} {{ $labels.name }} has spent its {{ $labels.period }}ly budget"
+          description: >-
+            Every request under it is refused with 429 until the period
+            turns, unless a cheaper model is named as its fallback.
+
+      - alert: TenantHittingLimits
+        expr: >-
+          sum by (tenant) (rate(llmgw_tenant_requests_total{outcome="limited"}[10m]))
+          / sum by (tenant) (rate(llmgw_tenant_requests_total[10m])) > 0.1
+        for: 10m
+        labels: { severity: warning }
+        annotations:
+          summary: "{{ $value | humanizePercentage }} of {{ $labels.tenant }}'s requests are refused by a limit"
+          description: >-
+            A rate, token or budget limit is turning their traffic away. Either
+            the limit is too low for what they now do, or something of theirs
+            is looping.
+
+      - alert: TenantErrors
+        expr: >-
+          sum by (tenant) (rate(llmgw_tenant_requests_total{outcome="error"}[10m]))
+          / sum by (tenant) (rate(llmgw_tenant_requests_total[10m])) > 0.05
+          and sum by (tenant) (rate(llmgw_tenant_requests_total[10m])) > 0.05
+        for: 10m
+        labels: { severity: warning }
+        annotations:
+          summary: "{{ $value | humanizePercentage }} of {{ $labels.tenant }}'s requests fail"
+          description: >-
+            Not counting refusals by a limit. If every tenant fails alike it
+            is a model (ModelFailing); one alone is usually what they send —
+            prompts past the context, a model they may not use.
+
+      - alert: TenantTrafficSpike
+        expr: >-
+          sum by (tenant) (rate(llmgw_tenant_requests_total[30m]))
+          > 3 * sum by (tenant) (rate(llmgw_tenant_requests_total[7d]))
+          and sum by (tenant) (rate(llmgw_tenant_requests_total[30m])) > 0.2
+        for: 15m
+        labels: { severity: info }
+        annotations:
+          summary: "{{ $labels.tenant }} is sending three times its weekly average"
+          description: >-
+            A new workload, a batch job, or a client retrying in a loop. Only
+            for a tenant sending more than one request every five seconds, so
+            a quiet team starting work in the morning does not page anybody.
+
+      - alert: TenantSlowFirstToken
+        expr: >-
+          histogram_quantile(0.95,
+            sum by (tenant, le) (rate(llmgw_tenant_ttft_seconds_bucket[15m]))) > 10
+          and sum by (tenant) (rate(llmgw_tenant_ttft_seconds_count[15m])) > 0.02
+        for: 15m
+        labels: { severity: warning }
+        annotations:
+          summary: "{{ $labels.tenant }} waits {{ $value | humanizeDuration }} for a first token at p95"
+          description: >-
+            What their people feel. Compare with SlowFirstToken per model: if
+            only this tenant is slow, it is the models it uses or its queue
+            band, not the cluster.
+  # The store, when it is a replicated cluster under Patroni (llmgw server
+  # init --patroni). Published only for a store of several hosts.
+  - name: llmgw-store
+    rules:
+      - alert: StoreHasNoLeader
+        expr: llmgw_store_patroni_up == 1 and on() count(llmgw_store_member{role="leader"}) == 0
+        for: 1m
+        labels: { severity: critical }
+        annotations:
+          summary: "The store's cluster has no primary"
+          description: >-
+            Every write fails — keys, usage, budgets, leadership. Patroni
+            promotes a standby within its 30-second TTL; a minute without one
+            means it cannot: etcd has lost its majority, or no standby is fit.
+            `patronictl -c /etc/patroni/config.yml list` on a member says which.
+
+      - alert: StorePatroniUnreachable
+        expr: llmgw_store_patroni_up == 0
+        for: 2m
+        labels: { severity: warning }
+        annotations:
+          summary: "No member of the store's cluster answers on its Patroni port"
+          description: >-
+            The control plane reads the cluster's state from port 8008 on each
+            member. The database may still be serving; nothing here can tell.
+
+      - alert: StoreReplicaNotStreaming
+        expr: llmgw_store_member{role!="leader", state!="streaming"} == 1
+        for: 5m
+        labels: { severity: warning }
+        annotations:
+          summary: "{{ $labels.member }} is {{ $labels.state }}, not streaming from the primary"
+          description: >-
+            A standby that is not streaming is not a standby: if the primary
+            is lost now, there is nothing to promote. "missing" is a host of
+            the store address the cluster no longer lists — usually a machine
+            that is down.
+
+      - alert: StoreReplicaBehind
+        expr: llmgw_store_replica_lag_bytes > 64 * 1024 * 1024 or llmgw_store_replica_lag_bytes == -1
+        for: 10m
+        labels: { severity: warning }
+        annotations:
+          summary: "{{ $labels.member }} is {{ $value | humanize1024 }}B behind the primary"
+          description: >-
+            Patroni will not promote a standby more than 1 MB behind, so a
+            failover now would find none fit. -1 is a lag Patroni cannot read.
+
+  - name: llmgw-guard
+    rules:
+      - alert: GuardFailingOpen
+        expr: >-
+          sum(rate(llmgw_guard_fail_open_total[5m]))
+            / clamp_min(sum(rate(llmgw_guard_checks_total[5m])), 1e-9) > 0.01
+        for: 5m
+        labels: { severity: warning }
+        annotations:
+          summary: "{{ $value | humanizePercentage }} of judged traffic is served unjudged"
+          description: >-
+            A guard policy's judge model is not answering within its latency
+            budget, and the policy fails open: requests go through flagged
+            "judge unavailable" instead of being judged.
+            llmgw_guard_judge_errors_total says whether it is timing out or
+            not there; `llmgw ctl replicas` whether the judge has replicas.
+
+      - alert: GuardJudgeSlow
+        expr: >-
+          histogram_quantile(0.95, sum by (le, judge_model) (rate(llmgw_guard_judge_latency_seconds_bucket[5m]))) > 0.25
+        for: 10m
+        labels: { severity: warning }
+        annotations:
+          summary: "Judge {{ $labels.judge_model }} answers in {{ $value | humanizeDuration }} at p95"
+          description: >-
+            Over the default latency budget: every judged request waits this
+            long, and those over their policy's budget are served unjudged or
+            refused. Give the judge more replicas, or faster ones.
+
+      - alert: GuardJudgeUnavailable
+        expr: sum by (reason) (rate(llmgw_guard_judge_errors_total{reason!="timeout"}[5m])) > 0
+        for: 5m
+        labels: { severity: critical }
+        annotations:
+          summary: "The guardrails cannot ask their judge ({{ $labels.reason }})"
+          description: >-
+            no_judge: a policy names a model that is not in the catalog with
+            role: guard. unavailable: it has no replica answering. format: it
+            answers in a form its guard.format does not read.
+
+      - alert: GuardBlocksSpiking
+        expr: >-
+          sum by (tenant) (rate(llmgw_tenant_guard_blocks_total[1h]))
+            > 3 * sum by (tenant) (rate(llmgw_tenant_guard_blocks_total[7d]))
+          and sum by (tenant) (increase(llmgw_tenant_guard_blocks_total[1h])) > 10
+        for: 15m
+        labels: { severity: warning }
+        annotations:
+          summary: "{{ $labels.tenant }} is being blocked three times as often as usual"
+          description: >-
+            A tenant's requests or answers are blocked by the guardrails
+            more than three times their weekly rate. Someone probing, a
+            client sending data it should not, or a policy that changed.
+            The /admin/guard page lists the recent ones by request.
+
+      - alert: GuardSecretInAnswer
+        expr: sum(increase(llmgw_guard_checks_total{stage="output",category="secret",action!="allowed"}[5m])) > 0
+        labels: { severity: critical }
+        annotations:
+          summary: "A model put a credential in an answer"
+          description: >-
+            An answer contained something shaped like a key or a private key.
+            It was stopped or rewritten if the policy enforces; either way a
+            model has seen it, in its prompt or its training. The usage rows
+            with guard_category secret say which request.
+
+  - name: llmgw-slo
+    rules:
+      - alert: ModelTTFTOverSLO
+        expr: >-
+          histogram_quantile(0.99, sum by (le, model) (rate(llmgw_ttft_seconds_bucket[10m])))
+            > on (model) group_left llmgw_model_slo_seconds{kind="ttft_p99"}
+        for: 15m
+        labels: { severity: warning }
+        annotations:
+          summary: "{{ $labels.model }} answers its first token past its SLO at p99"
+          description: >-
+            The p99 time to the first token over ten minutes is past the
+            model's slo.ttft_p99. Admission already holds the lower bands back
+            while it is; this says it has lasted. More replicas, or less
+            traffic in the bands above.
+
+      - alert: ModelTPOTOverSLO
+        expr: >-
+          histogram_quantile(0.99, sum by (le, model) (rate(llmgw_tpot_seconds_bucket[10m])))
+            > on (model) group_left llmgw_model_slo_seconds{kind="tpot_p99"}
+        for: 15m
+        labels: { severity: warning }
+        annotations:
+          summary: "{{ $labels.model }} produces tokens slower than its SLO at p99"
+          description: >-
+            The p99 time per output token is past slo.tpot_p99: replicas are
+            batching more than they can decode quickly, or a slower card is
+            serving. llmgw_output_tokens_per_second by pool says which.

deploy/monitoring/prometheus.yml

@@ -21,11 +21,34 @@ scrape_configs:
   # The control plane's dedicated metrics port. Not its admin listener: that one
   # is loopback because it also serves pprof, and pprof can dump the heap where
   # API keys sit in plaintext.
+  #
+  # Every control plane, one line each: the leader moves on restarts and the
+  # router's metrics are the leading one's, so scraping one alone leaves gaps
+  # — and alerts on them — whenever another leads.
   - job_name: llmgw
     static_configs:
       - targets: ['10.0.0.140:9091']
         labels:
-          instance: control-plane
+          instance: control-plane-140
+      # - targets: ['10.0.0.150:9091']
+      #   labels:
+      #     instance: control-plane-150
+
+  # Every machine of the cluster, for its node exporter: network and disk
+  # traffic, filesystems, CPU time. The control plane lists them — nodes,
+  # itself, the store's members — so a node added is a node scraped with
+  # nothing edited here, and each carries its llmgw id as the node label.
+  # `llmgw node add` installs the exporter; on a machine added before that,
+  # apt-get install prometheus-node-exporter.
+  # Asked of every control plane too: a standby lists only the control
+  # planes and the store, and they label every machine alike, so the same
+  # target from two of them is scraped once.
+  - job_name: nodes
+    http_sd_configs:
+      - url: http://10.0.0.140:9091/prometheus/targets
+        refresh_interval: 1m
+      # - url: http://10.0.0.150:9091/prometheus/targets
+      #   refresh_interval: 1m
 
   - job_name: prometheus
     static_configs:

deploy/proxy/Caddyfile

@@ -14,6 +14,7 @@ llm.example.com {
 		max_size 32MB
 	}
 
+	# One control plane. With more than one, see the end of this file.
 	reverse_proxy 127.0.0.1:8080 {
 		# Tokens are written the moment they are generated. Without this a
 		# streamed reply can arrive in bursts, and a client measuring time to
@@ -39,3 +40,36 @@ llm.example.com {
 	# Access log to stderr, which under systemd is the journal.
 	log
 }
+
+# More than one control plane (server init --standbys, server add): one of
+# them leads, the others stand by. Name them all and send to the one that
+# leads — /leader is 200 there and 503 on a standby. Not /ready: that is 503
+# on a leader with no model running yet, and would take the portal away with
+# it. A standby would pass a request on to the leader anyway, but not while
+# there is none, and the hop is for nothing.
+#
+# With a floating address (--vip) the address already follows the leader:
+# give reverse_proxy that one address instead, and keep the rest as above.
+#
+# llm.example.com {
+# 	request_body {
+# 		max_size 32MB
+# 	}
+# 	reverse_proxy 10.0.0.157:8080 10.0.0.158:8080 10.0.0.159:8080 {
+# 		# The first that is healthy: the leader, whichever it is.
+# 		lb_policy first
+# 		health_uri /leader
+# 		health_interval 2s
+# 		health_timeout 2s
+# 		# While leadership moves — a few seconds when a leader is lost —
+# 		# none is healthy; a request waits that long for one rather than
+# 		# failing at once.
+# 		lb_try_duration 15s
+# 		lb_try_interval 250ms
+# 		flush_interval -1
+# 		transport http {
+# 			response_header_timeout 15m
+# 		}
+# 	}
+# 	log
+# }

docs.go

@@ -0,0 +1,109 @@
+// Package llmgw holds what the binary carries besides code: its manual, the
+// description of its admin API, and the example quality suites.
+package llmgw
+
+import (
+	"embed"
+	"io/fs"
+	"sort"
+	"strings"
+)
+
+// Docs is the documentation, read on any machine by `llmgw docs` and the
+// console's manual without a checkout or the internet.
+//
+//go:embed README.md CHANGELOG.md docs/*.md
+var Docs embed.FS
+
+// Doc is one page of the manual.
+type Doc struct {
+	// Key is what `llmgw docs KEY` takes, and the page's address under /docs/
+	// on the gateway.
+	Key string
+	// Path is the file in Docs.
+	Path string
+	// Title is the document's first heading.
+	Title string
+}
+
+// Source is the document's markdown.
+func (d Doc) Source() string {
+	b, err := fs.ReadFile(Docs, d.Path)
+	if err != nil {
+		return "# " + d.Path + "\n\nNot in this build."
+	}
+	return string(b)
+}
+
+// docOrder is the documents in the order someone new reads them. Here rather
+// than with either reader, because the console's manual and the gateway's
+// docs portal both list them, and two lists drift.
+var docOrder = []string{"console", "quick-install", "install", "node-onboarding", "onboarding",
+	"clients", "guardrails", "knowledge", "choosing-models", "fabrics", "facility-aware-placement", "data",
+	"reference", "development"}
+
+// Manual is every document, in reading order: those docOrder names, then any
+// other under docs/ alphabetically, so a new one is never missing, then the
+// README and the changes.
+func Manual() []Doc {
+	var out []Doc
+	seen := map[string]bool{}
+	add := func(key, path string) {
+		if seen[key] {
+			return
+		}
+		b, err := fs.ReadFile(Docs, path)
+		if err != nil {
+			return
+		}
+		seen[key] = true
+		out = append(out, Doc{Key: key, Path: path, Title: titleOf(string(b), path)})
+	}
+	for _, k := range docOrder {
+		add(k, "docs/"+k+".md")
+	}
+	entries, _ := fs.ReadDir(Docs, "docs")
+	var rest []string
+	for _, e := range entries {
+		if strings.HasSuffix(e.Name(), ".md") {
+			rest = append(rest, strings.TrimSuffix(e.Name(), ".md"))
+		}
+	}
+	sort.Strings(rest)
+	for _, k := range rest {
+		add(k, "docs/"+k+".md")
+	}
+	add("readme", "README.md")
+	add("changes", "CHANGELOG.md")
+	return out
+}
+
+// titleOf is a document's first top-level heading, or its path when it has
+// none.
+func titleOf(src, path string) string {
+	for _, l := range strings.Split(src, "\n") {
+		if strings.HasPrefix(l, "# ") {
+			return strings.TrimSpace(strings.TrimPrefix(l, "# "))
+		}
+	}
+	return path
+}
+
+// AdminOpenAPI is the admin API described in OpenAPI 3.1, generated from its
+// route table by `go generate` in internal/docgen and served at
+// /api/v1/openapi.json, so a client can be pointed at the server it talks to.
+//
+//go:embed docs/admin-api.openapi.json
+var AdminOpenAPI []byte
+
+// ClientOpenAPI is the client API described in OpenAPI 3.1, generated from
+// internal/clientapi's route table and served at /v1/openapi.json.
+//
+//go:embed docs/client-api.openapi.json
+var ClientOpenAPI []byte
+
+// EvalSuites are the example quality suites under deploy/eval, which the
+// control plane runs by name when its eval directory has none of the name.
+//
+//go:embed deploy/eval/*.yaml
+var EvalSuites embed.FS

docs/admin-api.md

@@ -0,0 +1,169 @@
+# The admin API
+
+Written for whoever automates a cluster rather than typing at it: how to reach
+the control plane's management API, what it asks of a request, and where its
+description is.
+
+`llmgw ctl` and the console are clients of this API and nothing more, so
+anything they do can be done with `curl`, a generated client or the
+[Terraform provider](../terraform-provider-llmgw/README.md). It adds and
+removes models, scales them, cordons and upgrades nodes, sets capacity
+quotas, attaches guardrail policies, adds organizations, teams and projects,
+issues and revokes API keys, puts people in the tree, and reads the fleet,
+usage and the audit log.
+
+## Reaching it
+
+The API is under `/api/v1` on the admin listener, `admin_listen` in
+`/etc/llmgw/server.yaml`: `127.0.0.1:9090` unless changed. It is on loopback
+on purpose. The same listener serves pprof when it is turned on, and the
+server refuses to start with it on any other address unless
+`admin_remote: true` — the token would cross the network in clear.
+
+From another machine, tunnel to it rather than moving it:
+
+```sh
+ssh -N -L 9090:127.0.0.1:9090 admin@control-plane &
+curl -s -H "Authorization: Bearer $LLMGW_ADMIN_TOKEN" http://127.0.0.1:9090/api/v1/summary
+```
+
+With `admin_remote: true` and `admin_listen: 10.0.0.5:9090`, call that address
+directly — on a network you trust, or behind a TLS proxy that keeps the
+`Host` header an address.
+
+## The token
+
+Every path under `/api` needs the admin token as a bearer token:
+
+```
+Authorization: Bearer 6f1c…
+```
+
+The server writes it the first time it starts, 0600, to
+`/var/lib/llmgw/admin-token` under its systemd unit (`admin_token_file`
+moves it; a server run by hand keeps it in `secrets/admin-token` beside its
+configuration). `llmgw ctl` reads it from there, which is why it runs with
+sudo, or from `LLMGW_ADMIN_TOKEN`. To give it to automation:
+
+```sh
+sudo cat /var/lib/llmgw/admin-token
+```
+
+The token is the whole of the API's authorisation: whoever holds it can do
+everything the API does. Keep it where you keep other root credentials.
+
+## What a request must look like
+
+Besides the token, the listener refuses three things before a handler sees
+them, as defences against a browser being turned against it:
+
+- **A name in `Host`.** The listener answers to an address or `localhost`,
+  not a DNS name, so a page on some other site cannot reach it by rebinding
+  a name to 127.0.0.1. Call it as `http://127.0.0.1:9090`, not
+  `http://cp.example.com:9090`; behind a proxy, have the proxy send an
+  address.
+- **A cross-site request.** One whose `Origin` is another host, or whose
+  `Sec-Fetch-Site` says another site sent it.
+- **A change that is not JSON.** Every method but `GET` and `HEAD` must carry
+  `Content-Type: application/json`, even a `DELETE` or a `POST` with no body.
+  A form post from a page cannot set that header.
+
+A change is recorded in the audit log with who made it, as the request says
+in `X-Llmgw-Actor` (letters, digits and `._-@`, at most 64; `unknown` when
+absent). `llmgw ctl` sends the name of whoever ran it; automation should send
+its own, `terraform` or `ci@deploy`, so `llmgw ctl audit` can tell them apart.
+
+A refusal is a 4xx or 5xx with `{"error": "…"}` saying why. 501 means this
+control plane lacks what the endpoint needs — a store, a mirror, guard
+policies — and says which.
+
+## Some calls
+
+```sh
+H=(-H "Authorization: Bearer $LLMGW_ADMIN_TOKEN" -H "Content-Type: application/json" -H "X-Llmgw-Actor: $USER")
+API=http://127.0.0.1:9090/api/v1
+
+# The fleet in one answer, and every model.
+curl -s "${H[@]}" $API/summary
+curl -s "${H[@]}" $API/models
+
+# Add a model, read back its definition with the defaults filled in, scale it.
+curl -s "${H[@]}" -X POST $API/models -d '{
+  "name": "qwen-small",
+  "source": "/srv/models/qwen2.5-1.5b-instruct-q4_k_m.gguf",
+  "profiles": [{"name": "cpu", "engine": "llamacpp", "min_memory_gb": 4, "cpu_cores": 4}],
+  "scaling": {"min": 1, "max": 2}
+}'
+curl -s "${H[@]}" $API/models/qwen-small
+curl -s "${H[@]}" -X POST $API/models/qwen-small/scale -d '{"min": 0, "max": 2, "idle_timeout": 1800000000000}'
+
+# A team's capacity quota.
+curl -s "${H[@]}" -X PUT $API/quotas -d '{"scope": "team:Acme/ml", "limit": {"gpus": 8}}'
+
+# An organization, a team in it and a project in that; then a key for the
+# project. The answer holds the key once: only its hash is kept.
+curl -s "${H[@]}" -X POST $API/orgs -d '{"name": "Acme"}'
+curl -s "${H[@]}" -X POST $API/teams -d '{"name": "ml", "in": "Acme"}'
+curl -s "${H[@]}" -X POST $API/projects -d '{"name": "search", "in": "Acme/ml"}'
+curl -s "${H[@]}" -X POST $API/keys -d '{"name": "ci", "project": "Acme/ml/search", "expires_in": "720h"}'
+curl -s "${H[@]}" -X POST $API/users/ayse@example.com/memberships -d '{"target": "team:Acme/ml"}'
+
+# Remove the model; a DELETE carries the content type too.
+curl -s "${H[@]}" -X DELETE $API/models/qwen-small
+```
+
+Durations in bodies are integer nanoseconds, as Go encodes them: half an hour
+is `1800000000000`.
+
+## The description
+
+The API is described in OpenAPI 3.1:
+
+- served by every control plane at `GET /api/v1/openapi.json` (with the
+  token, like the rest), as built into that binary, so it describes the
+  server you are talking to;
+- committed as [admin-api.openapi.json](admin-api.openapi.json) for reading
+  without a cluster.
+
+```sh
+curl -s "${H[@]}" $API/openapi.json > llmgw-admin.json
+```
+
+It lists every endpoint, its path and query parameters, and the schema of
+each request and answer, with the meaning of each field. Load it into any
+OpenAPI tool — Swagger UI, Redoc, an editor — or generate a client from it:
+
+```sh
+docker run --rm -v "$PWD:/w" openapitools/openapi-generator-cli generate \
+  -i /w/llmgw-admin.json -g python -o /w/llmgw-admin-client
+```
+
+### How it is kept true
+
+The document is generated, not written. `internal/control/adminapi/routes.go`
+holds a table of every endpoint: its method and path, a summary, its query
+parameters, and Go values of the types it reads and answers with. The
+generator in `internal/docgen/openapi` reads those types by reflection, the
+way `encoding/json` encodes them, and takes each field's description from its
+comment in the source.
+
+Two tests keep it from drifting. One registers the API on a recording mux and
+fails when an endpoint is served and not in the table, or in the table and not
+served. The other regenerates the document and fails when it differs from the
+committed one. After changing an endpoint or a type it carries:
+
+```sh
+go generate ./internal/docgen
+```
+
+## What it does not cover
+
+- **Making people's accounts.** People sign up, are invited, or come from
+  the identity provider (OIDC, SCIM); the API lists them and puts them in
+  the tree, and `llmgw users` approves, disables and deletes them. Key
+  lifetime limits and spending limits are `llmgw keys ttl` and `llmgw keys
+  limits`.
+- **The client-facing API** (`/v1/chat/completions` and the rest), which is
+  OpenAI's and Anthropic's, on `listen`, with API keys.
+- **The rest of the admin listener**: `/metrics`, `/health`, the dashboard
+  pages and `/debug/pprof`, which are not under `/api`.

docs/clients.md

@@ -0,0 +1,633 @@
+# Using llmgw from code
+
+Written for a developer whose program talks to a model through llmgw. There
+is no llmgw SDK, and there will not be one: the gateway speaks OpenAI's API
+and Anthropic's Messages API, so the official SDKs for both work as they are.
+Only two things change — the base URL and the key. Everything llmgw adds on
+top is an HTTP header, which every one of those SDKs lets you set.
+
+The examples use `https://llm.example.com` for the gateway; use the address
+your operator gave you, or the one on the gateway's own front page. Every
+example reads the key from `LLMGW_API_KEY`. `<model-name>` is a model this
+gateway serves: `GET /v1/models` lists the ones your key may use, and sending
+the placeholder unchanged is answered with that list rather than with an
+error.
+
+## Getting a key
+
+Keys are made on the gateway's **Account** page after signing in, or issued
+by an operator. A key is shown once and never again — only its hash is kept —
+so put it in a password manager straight away. `GET /me` with the key says
+what it may do and what it has spent.
+
+## The base URL and the key
+
+| SDK | Base URL | Key |
+|---|---|---|
+| OpenAI (any language) | `https://llm.example.com/v1` | `Authorization: Bearer …`, as the SDK sends it |
+| Anthropic (any language) | `https://llm.example.com` — the SDK adds `/v1/messages` | `x-api-key: …`, as the SDK sends it |
+
+Both SDKs also read their usual environment variables, so a program that
+already uses them needs no change at all:
+
+```
+export OPENAI_BASE_URL=https://llm.example.com/v1
+export OPENAI_API_KEY=$LLMGW_API_KEY
+
+export ANTHROPIC_BASE_URL=https://llm.example.com
+export ANTHROPIC_API_KEY=$LLMGW_API_KEY
+```
+
+### The API described
+
+Every endpoint is described in OpenAPI 3.1 at `/v1/openapi.json`. It needs
+no key, so a client generator can be pointed at it. `/docs/api` shows it in
+Swagger UI, where *Authorize* takes a key and *Try it out* sends a request to
+the gateway. People with a part in running the gateway also find the admin
+API's document there.
+
+## A first request
+
+### curl
+
+```
+curl https://llm.example.com/v1/chat/completions \
+  -H "Authorization: Bearer $LLMGW_API_KEY" \
+  -H "Content-Type: application/json" \
+  -d '{"model": "<model-name>",
+       "messages": [{"role": "user", "content": "Say hello in Turkish."}]}'
+```
+
+### Python
+
+```
+pip install openai
+```
+
+```python
+import os
+from openai import OpenAI
+
+client = OpenAI(base_url="https://llm.example.com/v1",
+                api_key=os.environ["LLMGW_API_KEY"])
+
+reply = client.chat.completions.create(
+    model="<model-name>",
+    messages=[{"role": "user", "content": "Say hello in Turkish."}],
+)
+print(reply.choices[0].message.content)
+```
+
+### TypeScript
+
+```
+npm install openai
+```
+
+```typescript
+import OpenAI from "openai";
+
+const client = new OpenAI({
+  baseURL: "https://llm.example.com/v1",
+  apiKey: process.env.LLMGW_API_KEY,
+});
+
+const reply = await client.chat.completions.create({
+  model: "<model-name>",
+  messages: [{ role: "user", content: "Say hello in Turkish." }],
+});
+console.log(reply.choices[0].message.content);
+```
+
+### Go
+
+```
+go get github.com/openai/openai-go/v3
+```
+
+```go
+package main
+
+import (
+	"context"
+	"fmt"
+	"log"
+	"os"
+
+	"github.com/openai/openai-go/v3"
+	"github.com/openai/openai-go/v3/option"
+)
+
+func main() {
+	client := openai.NewClient(
+		option.WithBaseURL("https://llm.example.com/v1/"),
+		option.WithAPIKey(os.Getenv("LLMGW_API_KEY")),
+	)
+	reply, err := client.Chat.Completions.New(context.Background(), openai.ChatCompletionNewParams{
+		Model:    "<model-name>",
+		Messages: []openai.ChatCompletionMessageParamUnion{openai.UserMessage("Say hello in Turkish.")},
+	})
+	if err != nil {
+		log.Fatal(err)
+	}
+	fmt.Println(reply.Choices[0].Message.Content)
+}
+```
+
+The import path carries the SDK's major version; use the one your module
+already has.
+
+## Streaming
+
+Set `stream` and read the chunks. llmgw may send a last chunk that carries
+only the token counts and no choices, so check for a choice before reading
+one — the OpenAI API does the same when usage is asked for.
+
+```python
+stream = client.chat.completions.create(
+    model="<model-name>",
+    messages=[{"role": "user", "content": "Count to ten."}],
+    stream=True,
+)
+for chunk in stream:
+    if chunk.choices and chunk.choices[0].delta.content:
+        print(chunk.choices[0].delta.content, end="", flush=True)
+print()
+```
+
+```typescript
+const stream = await client.chat.completions.create({
+  model: "<model-name>",
+  messages: [{ role: "user", content: "Count to ten." }],
+  stream: true,
+});
+for await (const chunk of stream) {
+  process.stdout.write(chunk.choices[0]?.delta?.content ?? "");
+}
+```
+
+```go
+stream := client.Chat.Completions.NewStreaming(ctx, openai.ChatCompletionNewParams{
+	Model:    "<model-name>",
+	Messages: []openai.ChatCompletionMessageParamUnion{openai.UserMessage("Count to ten.")},
+})
+for stream.Next() {
+	chunk := stream.Current()
+	if len(chunk.Choices) > 0 {
+		fmt.Print(chunk.Choices[0].Delta.Content)
+	}
+}
+if err := stream.Err(); err != nil {
+	log.Fatal(err)
+}
+```
+
+With curl, add `"stream": true` to the body and `-N` so curl prints the
+events as they come.
+
+## Tools
+
+Function calling is OpenAI's: describe the tools, run the ones the model
+asks for, send the results back. Whether a model calls tools well is the
+model's business, not the gateway's; ask your operator which of the served
+models are set up for it.
+
+**Editors' agents need such a model.** Continue's Agent mode, Cline and
+Codex act only through tool calls: with a model whose calls come back as
+text — `<tool_call>{...}` or a JSON block in the answer, `tool_calls` empty —
+they chat but never read a file or run a command. Qwen2.5-Coder is one;
+Qwen3-Coder is not. The configuration the portal writes for Continue says
+`tool_use` only for a model whose catalog entry says tools, and gives
+Continue the model's context and longest answer, so it never sends a request
+the gateway refuses.
+
+```python
+import json
+
+tools = [{
+    "type": "function",
+    "function": {
+        "name": "get_weather",
+        "description": "The current weather in a city.",
+        "parameters": {
+            "type": "object",
+            "properties": {"city": {"type": "string"}},
+            "required": ["city"],
+        },
+    },
+}]
+
+messages = [{"role": "user", "content": "Is it raining in Ankara?"}]
+reply = client.chat.completions.create(model="<model-name>", messages=messages, tools=tools)
+msg = reply.choices[0].message
+
+if msg.tool_calls:
+    messages.append(msg)
+    for call in msg.tool_calls:
+        args = json.loads(call.function.arguments)
+        result = {"city": args["city"], "raining": False}  # your code here
+        messages.append({"role": "tool", "tool_call_id": call.id,
+                         "content": json.dumps(result)})
+    reply = client.chat.completions.create(model="<model-name>", messages=messages, tools=tools)
+
+print(reply.choices[0].message.content)
+```
+
+## Embeddings
+
+```python
+result = client.embeddings.create(
+    model="<embedding-model>",
+    input=["llmgw routes requests", "to GPUs it can reach"],
+)
+vectors = [d.embedding for d in result.data]
+```
+
+```typescript
+const result = await client.embeddings.create({
+  model: "<embedding-model>",
+  input: ["llmgw routes requests", "to GPUs it can reach"],
+});
+const vectors = result.data.map((d) => d.embedding);
+```
+
+An embedding model is a model of its own; a chat model does not answer
+`/v1/embeddings`.
+
+## The Responses API
+
+`/v1/responses` is served too, for clients that speak nothing else (Codex
+among them). llmgw translates it to chat completions, so it works with every
+model the gateway serves; what has no equivalent there — OpenAI's hosted
+tools, reasoning summaries — is ignored rather than refused.
+
+```python
+response = client.responses.create(
+    model="<model-name>",
+    instructions="Answer in one sentence.",
+    input="Why is the sky blue?",
+)
+print(response.output_text)
+```
+
+Streamed, the events are the Responses API's own:
+
+```python
+stream = client.responses.create(model="<model-name>", input="Count to ten.", stream=True)
+for event in stream:
+    if event.type == "response.output_text.delta":
+        print(event.delta, end="", flush=True)
+```
+
+## Batches
+
+For work that need not finish now: OpenAI's Files and Batch APIs. A batch runs
+at the lowest priority, so it uses what interactive traffic leaves free, and
+each line is counted against the key that submitted it.
+
+```python
+import json
+
+with open("requests.jsonl", "w") as f:
+    for i, text in enumerate(["first document", "second document"]):
+        f.write(json.dumps({
+            "custom_id": f"doc-{i}",
+            "method": "POST",
+            "url": "/v1/chat/completions",
+            "body": {"model": "<model-name>",
+                     "messages": [{"role": "user", "content": "Summarise: " + text}]},
+        }) + "\n")
+
+batch_file = client.files.create(file=open("requests.jsonl", "rb"), purpose="batch")
+batch = client.batches.create(
+    input_file_id=batch_file.id,
+    endpoint="/v1/chat/completions",
+    completion_window="24h",
+)
+
+# Later:
+batch = client.batches.retrieve(batch.id)
+if batch.status == "completed":
+    for line in client.files.content(batch.output_file_id).text.splitlines():
+        result = json.loads(line)
+        print(result["custom_id"], result["response"]["body"]["choices"][0]["message"]["content"])
+```
+
+## The Anthropic SDK
+
+`/v1/messages` is Anthropic's Messages API, translated to chat completions and
+back, streamed or not, with tools and images. It serves the gateway's own
+models — `model` is a model this gateway serves, not a Claude model.
+
+```
+pip install anthropic
+```
+
+```python
+import os
+import anthropic
+
+client = anthropic.Anthropic(base_url="https://llm.example.com",
+                             api_key=os.environ["LLMGW_API_KEY"])
+
+message = client.messages.create(
+    model="<model-name>",
+    max_tokens=1024,
+    messages=[{"role": "user", "content": "Say hello in Turkish."}],
+)
+print(message.content[0].text)
+
+with client.messages.stream(
+    model="<model-name>",
+    max_tokens=1024,
+    messages=[{"role": "user", "content": "Count to ten."}],
+) as stream:
+    for text in stream.text_stream:
+        print(text, end="", flush=True)
+```
+
+```typescript
+import Anthropic from "@anthropic-ai/sdk";
+
+const client = new Anthropic({
+  baseURL: "https://llm.example.com",
+  apiKey: process.env.LLMGW_API_KEY,
+});
+
+const message = await client.messages.create({
+  model: "<model-name>",
+  max_tokens: 1024,
+  messages: [{ role: "user", content: "Say hello in Turkish." }],
+});
+for (const block of message.content) {
+  if (block.type === "text") console.log(block.text);
+}
+```
+
+```go
+client := anthropic.NewClient(
+	option.WithBaseURL("https://llm.example.com/"),
+	option.WithAPIKey(os.Getenv("LLMGW_API_KEY")),
+)
+message, err := client.Messages.New(ctx, anthropic.MessageNewParams{
+	Model:     "<model-name>",
+	MaxTokens: 1024,
+	Messages: []anthropic.MessageParam{
+		anthropic.NewUserMessage(anthropic.NewTextBlock("Say hello in Turkish.")),
+	},
+})
+if err != nil {
+	log.Fatal(err)
+}
+for _, block := range message.Content {
+	if text, ok := block.AsAny().(anthropic.TextBlock); ok {
+		fmt.Println(text.Text)
+	}
+}
+```
+
+(`github.com/anthropics/anthropic-sdk-go` and its `option` package.)
+
+With curl:
+
+```
+curl https://llm.example.com/v1/messages \
+  -H "x-api-key: $LLMGW_API_KEY" \
+  -H "anthropic-version: 2023-06-01" \
+  -H "Content-Type: application/json" \
+  -d '{"model": "<model-name>", "max_tokens": 1024,
+       "messages": [{"role": "user", "content": "Say hello in Turkish."}]}'
+```
+
+## What llmgw adds
+
+Each is a header, so a request stays exactly what the SDK would send anywhere
+else. Set one for every request on the client, or for one request:
+
+| | Every request | One request |
+|---|---|---|
+| Python (both SDKs) | `OpenAI(..., default_headers={...})` | `create(..., extra_headers={...})` |
+| TypeScript (both SDKs) | `new OpenAI({ ..., defaultHeaders: {...} })` | `create({...}, { headers: {...} })` |
+| Go (both SDKs) | `openai.NewClient(..., option.WithHeader(k, v))` | `New(ctx, params, option.WithHeader(k, v))` |
+| curl | | `-H "k: v"` |
+
+### Stored conversations: `x-llmgw-thread`
+
+Send the same thread id with each request and only the new turn; llmgw puts
+the stored conversation in front of it. The conversation continues on
+whichever model serves the next turn, even a different one. It must be
+turned on for your project by an operator (`llmgw keys threads`); a request
+that names a thread on a gateway that keeps none is refused rather than
+answered without its history.
+
+```python
+import uuid
+
+thread = str(uuid.uuid4())  # anyone in your project who knows it reads it
+for turn in ["My name is Deniz.", "What is my name?"]:
+    reply = client.chat.completions.create(
+        model="<model-name>",
+        messages=[{"role": "user", "content": turn}],
+        extra_headers={"x-llmgw-thread": thread},
+    )
+    print(reply.choices[0].message.content)
+```
+
+A thread belongs to the project, not to the key, so use an id nobody can
+guess: at most 128 letters, digits and `- _ . :`. When the conversation no
+longer fits the model, the oldest turns are left out and the reply carries
+`x-llmgw-thread-trimmed` with how many. `DELETE /v1/threads/{id}` forgets one:
+
+```
+curl -X DELETE https://llm.example.com/v1/threads/$THREAD \
+  -H "Authorization: Bearer $LLMGW_API_KEY"
+```
+
+### Sessions: `x-session-id`
+
+Requests with the same session id go to the same replica while it is
+healthy, so a conversation that resends its history finds it already in that
+replica's cache and answers sooner. Without the header, the body's `user`
+field is used. Nothing is stored; it is only a routing hint.
+
+```python
+client = OpenAI(base_url="https://llm.example.com/v1", api_key=os.environ["LLMGW_API_KEY"],
+                default_headers={"x-session-id": "chat-7f3a"})
+```
+
+### Tags and metadata
+
+Requests can be labelled so the usage they record can be told apart — by
+feature, by customer, by job. Send OpenAI's own `metadata`, string keys to
+string values, or the same as the `x-llmgw-tags` header for a client that
+cannot set `metadata`; the `user` field is recorded too. Which tags also
+become metric labels is the operator's choice (`router.tag_labels`).
+
+```python
+reply = client.chat.completions.create(
+    model="<model-name>",
+    messages=[{"role": "user", "content": "Classify this ticket."}],
+    metadata={"feature": "triage", "customer": "acme"},
+    user="user-1234",
+)
+```
+
+```
+curl https://llm.example.com/v1/chat/completions \
+  -H "Authorization: Bearer $LLMGW_API_KEY" \
+  -H "x-llmgw-tags: feature=triage,customer=acme" \
+  -H "Content-Type: application/json" \
+  -d '{"model": "<model-name>", "messages": [{"role": "user", "content": "Classify this ticket."}]}'
+```
+
+### Canaries: `x-llmgw-variant`
+
+While an operator tries a model's newer weights on a share of its traffic, a
+session stays on one side. `x-llmgw-variant: canary` sends a request to the
+canary deliberately — to try it before it is promoted, or to compare the two.
+
+```python
+reply = client.chat.completions.create(
+    model="<model-name>",
+    messages=[{"role": "user", "content": "hello"}],
+    extra_headers={"x-llmgw-variant": "canary"},
+)
+```
+
+### Memory notes: `/v1/memory`
+
+Notes an agent keeps for itself across conversations: a key, some text, and
+optional tags, private to your project and to the agent named in
+`x-llmgw-agent` (`default` when it is not sent). An operator turns them on for
+a project (`llmgw keys memory`). They are plain REST, so any HTTP client
+will do:
+
+```
+H="Authorization: Bearer $LLMGW_API_KEY"
+
+curl -X PUT https://llm.example.com/v1/memory/favourite-colour -H "$H" \
+  -H "x-llmgw-agent: helper" -H "Content-Type: application/json" \
+  -d '{"text": "The user likes dark green.", "tags": ["preference"]}'
+
+curl "https://llm.example.com/v1/memory?q=green" -H "$H" -H "x-llmgw-agent: helper"
+curl "https://llm.example.com/v1/memory?tag=preference" -H "$H" -H "x-llmgw-agent: helper"
+curl https://llm.example.com/v1/memory/favourite-colour -H "$H" -H "x-llmgw-agent: helper"
+curl -X DELETE https://llm.example.com/v1/memory/favourite-colour -H "$H" -H "x-llmgw-agent: helper"
+```
+
+A key is up to 200 bytes, a note up to 16 KiB, with at most 16 tags of
+lowercase letters, digits, `-` and `_`, and 1000 notes per agent.
+
+### MCP: `/mcp`
+
+The same notes as tools an agent can be given — `remember`, `recall` and
+`forget` — from an MCP server at `https://llm.example.com/mcp` (the HTTP
+transport, answered as plain JSON). Add it to your agent's MCP servers with
+the key as a bearer token and, if you want notes kept apart, `x-llmgw-agent`.
+llmgw does not put these tools into requests by itself: an agent that is not
+given the server never sees its notes.
+
+```
+curl https://llm.example.com/mcp \
+  -H "Authorization: Bearer $LLMGW_API_KEY" \
+  -H "Content-Type: application/json" \
+  -d '{"jsonrpc": "2.0", "id": 1, "method": "tools/list"}'
+```
+
+**Pictures, 3D models, vision and workflows.** Where the gateway has the
+models for them, the same server offers more tools — only those it has a
+model for:
+
+| Tool | Does |
+|---|---|
+| `generate_image` | A picture from a prompt. `style` adds what a picture for a mesh wants: `concept` (one object, three-quarter view, grey background), `side` (an exact side view), `texture` (a seamless tile) or `none`. Answers the PNG's `file_id`, `url` and `seed`, with a 512 px preview to look at. |
+| `generate_mesh` | A GLB from a picture — `image` is a `file-…` id (a `generate_image` result, say), a data URL or base64 — or from a `prompt`, for which a concept picture is made first. `seed`, `resolution`, `texture_resolution`, and any other input the model's workflow declares in `inputs`. Answers the GLB's `file_id`, `url` and licence. |
+| `review_images` | Asks a vision model about one to four pictures (each shrunk to 1280 px on its long side); `json_schema` makes it answer that JSON. |
+| `run_workflow` | Runs a ComfyUI workflow from the inputs its catalog entry declares, and answers its result file. |
+| `job_status` | Where a mesh or a workflow run stands, and its file when done; `wait_seconds` waits for it. |
+| `gateway_status` | The picture, 3D, vision and workflow models, whether each is loaded on a GPU now, a workflow's inputs, and your last jobs. |
+
+Each tool makes its request of the gateway under your key, so your
+allowlist, limits, left-out licences and budget apply, and it is charged
+and listed like any other request. What it makes is kept as your file for
+as long as job results are: fetch it from `url` with the same key (`curl -H
+"Authorization: Bearer $LLMGW_API_KEY" -o rock.glb <url>`). A tool server
+over HTTP cannot write to your disk, so an agent that needs the file
+locally — to import it in Blender — fetches it, or goes through a small
+local bridge that does.
+
+A picture can be uploaded once and named by its id after: `POST /v1/files`
+with `purpose=vision` (or `user_data`) keeps it, for as long as job results
+are kept, as a file of yours that `generate_mesh`, `review_images` and a
+workflow's file inputs take as `file-…`. A call is at most 64 MB.
+
+A model that is not loaded is waited for: a picture or a look at one whose
+model is starting, or waiting for another to give up the GPU, waits as a
+mesh does, saying so, rather than failing with "model loading".
+
+A mesh takes from half a minute to a few minutes. A client that takes the
+answer as a stream (`Accept: text/event-stream`, as Claude Code does) is
+answered that way: `notifications/progress` for the call's
+`progressToken` while it runs — queued, waiting for the GPU, the node and
+its percent — then the result, and the call waits up to ten minutes. One
+answered in one piece waits 50 seconds; a job not done by then is answered
+with its `job_id`, to ask after with `job_status`. `wait_seconds` (up to
+900) sets either.
+
+```
+claude mcp add --transport http llmgw https://llm.example.com/mcp \
+  --header "Authorization: Bearer $LLMGW_API_KEY"
+```
+
+**Your company's tools.** Where an administrator has registered the
+company's own MCP servers (Jira, a file server, a database) and your key is
+granted their tools, the same `/mcp` lists them too, each as `server.tool`
+(`jira.search`). Give your agent only llmgw's `/mcp` and your key: the
+servers' own credentials stay with llmgw. A tool your key is not granted is
+not listed, and calling it by name is refused. Each call is in the audit
+log under your key: which tool, the size of what was sent, how it ended and
+how long it took, never what it said.
+
+### Licences you leave out
+
+A model's licence is in `/v1/models` (`license`: its `id`, `name`, whether
+it allows commercial use and the regions it grants nothing in). On your
+profile page, under **Licences**, you can leave licences out: one by one,
+every licence that forbids commercial use, or every licence that grants
+nothing in a region you name (`EU` for the union). The rules cover models
+added later too. From then on those models are not listed to your keys and
+a request for one is refused with 403 and the code `licence_excluded`,
+naming the choice that left it out — on every key you own and on the
+portal's pages, whatever a key's own allowlist says. A change reaches keys
+already in use within a minute.
+
+### Headers llmgw sends back
+
+| Header | Says |
+|---|---|
+| `x-request-id` | The request's id in the gateway's logs and usage records — quote it when asking an operator about a request. |
+| `x-llmgw-served-model` | The model that answered, when it was not the one asked for: a spent budget can move a request to a cheaper model. |
+| `x-llmgw-queue-ms` | How long the request waited for room before it was sent. |
+| `x-llmgw-thread-trimmed` | How many stored turns were left out to fit the model. |
+
+## When something is refused
+
+Errors come back in the shape of the API that was called — OpenAI's
+`{"error": {"message": …, "type": …}}` or Anthropic's — so each SDK raises
+its usual exception with the gateway's message in it. The ones worth knowing:
+
+| Status | Usually means |
+|---|---|
+| 400 | Besides a malformed request: a prompt too long for the model, or a guardrail policy refused it (the code `content_policy_violation`). |
+| 401 | No key, a mistyped one, or one that was revoked or has expired. |
+| 403 | The key may not use that model; with the code `licence_excluded`, its licence is one you left out on your profile page. |
+| 429 | A rate limit or budget of the key, its project or its team was reached. `Retry-After` says when to try again, and is absent when waiting will not help — a spent monthly budget. |
+| 503 | No model of that name is served (the message lists the ones that are), the model is still loading, or every replica is busy and the queue is full. The SDKs retry by themselves; a name that is not served will not start to be. |
+| 504 | Every replica was busy for as long as the key's band may wait. `Retry-After` says when to send it again. |
+
+## Priority
+
+With keys on, the key decides the request's priority band and routing
+profile, set by an operator; the `x-llmgw-band` and `x-llmgw-profile` headers
+are ignored, so a client cannot promote itself. On a gateway without keys
+they are read from the request.

docs/console.md

@@ -0,0 +1,391 @@
+# The console
+
+`sudo llmgw`, with nothing after it, on a machine llmgw runs on. On a machine
+with nothing installed it opens the setup screens; on a control plane, the
+console described here; on a node, the node's own console, which shows
+what runs on that machine and edits `agent.yaml`. Everything on these screens can also be done by command — each
+screen says which — so a script never needs them and a person never needs
+to remember the commands.
+
+The keyboard drives it; there is no mouse. **?** opens this page from
+anywhere, and the **Manual** entry holds every other page, as `llmgw docs`
+does without the console.
+
+## The layout
+
+A bar across the top names the machine. Down the left, the entries, in four
+groups: **Watch**, **People**, **Help**, **Settings** and **Do**. The panel on
+the right shows the entry chosen. The bottom line always says which keys do
+what at that moment, and a question or a result opens as a dialog over the
+panel.
+
+| Key | Does |
+|---|---|
+| ↑ ↓ | Choose an entry, or a row in the panel |
+| → or Enter | Go into the panel |
+| Enter on a row | What can be done to it: its details first, then the rest |
+| ← or Esc | Back out: from a page to its list, from the panel to the entries |
+| A | Add one, on a view that holds things: a quota, an account, a key |
+| PgUp PgDn | Scroll a long panel |
+| ? | This page |
+| Q | Leave; the cluster keeps running |
+| Ctrl-C | Leave at once |
+
+What is watched is read again every three seconds.
+
+## Forms and questions
+
+A change that needs values opens a form, filled in with what is set now. Tab
+or ↓ moves to the next field, ← → changes a choice, and Enter on **Apply**
+sends it; a form of one field is sent by Enter on it. A mistake the form can
+see — a maximum below the minimum, a word where a number goes — is said in the
+form and nothing is sent. One the control plane refuses comes back as a dialog
+with its reason, word for word.
+
+Anything that cannot be undone — removing, draining, deleting, revoking —
+asks first, and only **Y** goes ahead.
+
+Serving a model and moving one to new weights are jobs on the control plane:
+started from here, they run there in the background whatever this screen
+does, and the console is free at once. **Jobs** follows them. Upgrading the
+cluster, a backup and adding a node change this machine or another over ssh;
+those close the screen and run in the terminal, so their output is there to
+read, and Enter brings the console back.
+
+## Setting up
+
+On a machine with nothing installed, the control plane is set up from one
+form (`sudo llmgw server init`): the administrator's email, other names nodes
+reach the machine by, and ticks for PostgreSQL, the model mirror, this machine
+as a node, the starter model and the guardrails' judge. **Offline bundle**
+and **Its sha256** are for a site with no internet: the path of a bundle made
+by `llmgw bundle create`, and the sha256 it printed. Given, the bundle goes
+into the mirror, every file checked, and the cluster is set up to fetch
+nothing from outside (install.md, "Offline sites"). A bundle with no sha256,
+or with the mirror unticked, is said in the form and nothing starts.
+
+## Watch
+
+**Overview** is `llmgw ctl status`: nodes, GPUs by class, fabrics, replicas,
+models, the store's members, and anything parked, unplaced or idle.
+
+**Monitor** draws the cluster the way btop draws a machine: CPU, memory,
+GPU busy and GPU memory, requests and tokens a second, time to first token,
+requests in flight and queued, network and disk — Braille charts, filled
+and coloured green to red by height — over 5 minutes, an hour, a day or a
+week (**1**–**4**, or **R** for the next). Below them each node's CPU,
+memory and network now and as a sparkline, each card's busy, memory, heat
+and power, and each model's requests a second. The history comes from the
+Prometheus named by `monitoring.prometheus` in server.yaml; without one the
+charts draw what this console has seen since it opened, and say so. Network
+and disk come from each machine's node exporter, which `llmgw node add`
+installs. **N** sends a test notification to each webhook in server.yaml's
+`notify` section and says how each answered (`llmgw ctl notify test`). A node's and a model's own pages have their charts too, over the
+same range.
+
+**Nodes** lists every node with its state, where it is (its rack, or row,
+room or site, and PDUs), load, GPUs, replicas, disk and agent version. A node
+in a held rack reads *ready, held*. On a row:
+
+- **Details** — its address, location and any hold, system, load, engines and
+  GPUs, and any warning.
+- **Cordon** places nothing new on it; **Uncordon** undoes it.
+- **Location…** sets its site, room, row, rack and PDUs (the `llmgw.io/`
+  labels), which placement spreads replicas across.
+- **Hold rack …** places nothing new in the node's rack, and can drain it;
+  **Release …** on a node in a held domain undoes it. See
+  [facility-aware-placement.md](facility-aware-placement.md).
+- **Drain** moves its replicas off one at a time, each replacement up before
+  the original stops.
+- **vllm build / sglang build** (nodes with GPUs) — which build of the engine
+  the node installs: `auto` follows its hardware, `none` installs none.
+- **Upgrade its agent** to a release; its engines keep serving.
+- **Delete model files nothing uses** frees the node's disk.
+- **Remove from the cluster** — the control plane forgets it; the machine is
+  not touched.
+
+**GPUs** is every card: how busy, its memory, temperature, power, and the
+model holding it.
+
+**Models** lists the catalog: ready against wanted, status, class, profiles,
+and **UPDATE** when the registry has new weights for it. On a row:
+
+- **Details** — description, replicas, class, owner, profiles, source, where
+  its weights came from, what it reserves against what it uses, and its
+  replicas.
+- **Replicas (scale)** — the minimum kept running, the most it scales to,
+  and for a model loaded on demand how long it may sit unused. A maximum of
+  0 stops it.
+- **Class** — critical, standard or opportunistic: whose capacity gives way
+  when there is not enough for everyone.
+- **Owner** — the organization, team or project whose capacity quota it
+  counts against.
+- **Resources** — the memory and cores one replica reserves on its node.
+- **LoRA adapters** — `name=source[@scale]`, separated by commas.
+- **Restart its replicas**, one by one or in place.
+- **Update to …** — when the repository it came from has published different
+  weights for its files: they are fetched into the mirror beside the ones in
+  use, checked, swapped in, and the replicas replaced one at a time.
+  **Go back to …** returns to the weights the update replaced.
+  **Ask the registry for new weights now** checks without waiting for the
+  next scheduled look (`mirror.update_check`, six hours by default).
+- **Try the new weights as a canary…** — instead of swapping them in, runs
+  them beside the model as `MODEL-canary`, one replica, given the share of
+  its requests you choose. With a canary running the menu has **Canary's
+  share…**, **Promote the canary…** (the model moves to its weights, the
+  canary is removed) and **Take the canary out…**. A canary that errs or
+  answers more slowly than the model is taken out by itself. The MODEL
+  column shows `(10% to canary)` and `(canary of …)`.
+- **Ask it a quality suite…** — one of the suites the control plane has (in
+  `control.eval_dir`, or built in: `arithmetic`, `json-format`), asked
+  through the router; the dialog counts the answers as they come in, then
+  shows the score, each case and the model's last runs. Esc stops watching;
+  the run carries on and is kept. **Its quality runs** lists them, as
+  `llmgw ctl eval --history` does.
+- **Hold its updates to a quality suite…** — the suite and score its new
+  weights must reach before an update or a promotion moves it to them
+  (`llmgw ctl model gate`); **none** takes it away. With one set, **Update
+  to …** and **Promote the canary…** say so.
+- **Why is it placed where it is** — `llmgw ctl explain-placement`.
+- **Try again**, for a model parked after failing every start.
+- **Remove** — its replicas stop and it leaves the catalog. A model from
+  `server.yaml` is changed there instead; the console says so.
+
+**A** on Models adds one from a definition file on this machine: the YAML a
+model takes in `server.yaml`.
+
+**Replicas** lists every replica; on one, **Restart it**, replaced or in
+place.
+
+**Usage** is the last 24 hours by team, project or organization (→ changes
+which): requests, tokens, errors and spend.
+
+**Quotas** are capacity quotas: the GPUs, cores and memory each organization,
+team or project is guaranteed and may at most hold, and what it holds now.
+**A** adds one; on a row, change or remove it.
+
+**Knowledge** lists the knowledge-base collections: each one's owner, the
+model that embeds it, how many documents and chunks it holds and who else it
+is granted to. **A** makes one. On a row: its **Documents**, **Grant…** a
+project, team, organization, person or key read or write access, **Revoke**
+a grant, **Answer from it by default…** for a part of the tree, **Try a
+search…** as an administrator, or **Delete…** it. People
+fill collections from their own machines with `llmgw-kb`
+([knowledge.md](knowledge.md)). Off on a SQLite store, and says why.
+
+**MCP servers** lists the company's own MCP servers that agents reach through
+the gateway's `/mcp`, their tools named `server.tool`: whether each is on,
+who has been granted its tools, its rate per caller, the names of the
+credentials it is sent (never their values) and its address. **A** adds one:
+its name, which is its tools' prefix, its address, and a bearer token or
+another header, kept sealed in the store. On a row: **Test, and list its
+tools**, with its credential, as a call would; **Grant its tools to…** a
+team, project, organization, person or key — all of them, `jira.*`, or some
+by name — beside whatever else that level is granted, and saying when a
+level above keeps them out of reach; **Revoke** a grant;
+**Change…** its address, timeout or rate; **Replace its credential…**;
+**Turn off** (its tools are listed nowhere and every call refused) or on;
+**Remove…**. A server's tools are seen nowhere until granted. The screen
+also says how a person points an agent at the gateway, with a key of their
+own from `/profile/keys`. `llmgw ctl mcp` does the same from a shell, and
+the web page **MCP servers** (`/admin/mcp`, administrators only) in a browser.
+
+**Mirror** is what the model mirror holds, one row for each version of each
+model — a file, or the set of files a model of several is: shards, a vision
+projector, a config and tokenizer — with how far its download has got and
+which models use it. **A** downloads a URL into it; **I** imports a model
+from an Ollama on this machine into a mirror directory on this machine — the
+mirror beside the control plane — and shows the model definition to add for
+it (a mirror elsewhere: `llmgw mirror import-ollama` there); on a row, its files with
+their checksums and where each was fetched from, the source a model
+definition names for it, or remove it — with a warning when a model still
+uses it.
+
+**Jobs** lists the models being served or updated since the control plane
+started: what each is doing now — the download's progress, a replica
+starting — and whether it ended done, failed, or waiting for room on busy
+cards. The entry shows how many are running. Enter on one shows its steps.
+`llmgw ctl jobs` is the same, and `llmgw ctl jobs ID` follows one.
+
+**Logs** shows a node's agent log, newest at the bottom, errors and warnings
+coloured.
+
+## People
+
+The accounts, keys and organizations live in the store; these views read it
+and change it with the same commands as `llmgw users`, `llmgw keys` and
+`llmgw org`, so their checks and messages are the ones shown.
+
+**Accounts** — who has signed up, their state, whether they see the cluster
+dashboard, and what they belong to. **A** creates an account, already
+approved. On a row: approve one waiting, suspend or reinstate, give or take
+the cluster dashboard, add to or take out of an organization, team or
+project, their limits, a new password (their sessions close), delete, and
+**Forget them…** for a request to be forgotten (`llmgw users forget`).
+
+**API keys** — every key, its project, owner, state and last use. **A**
+issues one; the key is shown once, in the result, and never again. On a row:
+its limits, **Rotate…** — a new key with the same project, owner and limits,
+the old one working on for the overlap you give (`llmgw keys rotate`) — or
+revoke it.
+
+**Accounts** rows also have **Staff role…**:
+- `viewer` looks at every page under /admin and changes nothing;
+- `operator` also runs the cluster from them (models through the mirror, a
+  node's engines);
+- `billing` sees usage and quotas;
+- `admin` may do anything.
+
+The STAFF column shows each person's role.
+
+On **Usage**, **E** exports usage as CSV to a file on the control plane:
+by hour, day or month and any of organization, team, project, user, key and
+model.
+
+**Audit** lists every change of the last week — through `ctl`, this console
+or the /admin pages, and people's own keys and passwords — with who made
+it, through what, and how it ended. Enter shows the fields it was given,
+with anything secret taken out. `llmgw ctl audit` is the same, with filters.
+
+**Organizations** — the tenancy tree: organizations, their teams, the teams'
+projects, with members, keys and limits. **A** adds an organization. On a
+row: add a team or project inside it, rename, move, limits for the level and
+for each of its members, its capacity quota, and for a project how long
+conversations and agent notes are kept, and whether its requests are
+(**Keep requests…**: for how long, and what share), and whether they stay in
+the cluster (**Requests stay in the cluster…**: never an outside provider),
+and whether the same request is answered again from memory (**Cache
+answers…**: for how long, and whether only reproducible answers or any). **Longest key lifetime…** caps how
+long a key made there may live, and is the expiry of one made without any
+(`llmgw keys ttl`; `auth.max_key_ttl` in server.yaml caps every key).
+**Remove** takes away only something empty.
+
+Limits are requests and tokens a minute, a budget per day or month, and the
+models allowed. Each level only narrows what is above it.
+
+**Sign-in** — how people get in besides a password kept here: single
+sign-on, Active Directory and provisioning, each on or off, with the
+directory's last sync (how many people, accounts kept in step, suspended,
+reinstated).
+- **E** sets up Entra ID. Give the tenant ID, the client ID and secret,
+  and the groups for administrators and operators. A provider other than
+  Entra takes its issuer URL in place of the tenant. The form shows the
+  redirect address to register.
+- **D** sets up Active Directory: the servers, where people are, the
+  service account and its password, the domain's CA certificate as a PEM
+  file on this machine, the group whose members may sign in, and groups
+  for roles and teams.
+- Before it is kept, the directory is tried from the control plane: each
+  server reached and bound, how many people may sign in, how many are in
+  each group. If any step fails, nothing is kept and the steps are shown.
+  **T** tries the settings in force.
+- On the provisioning row, Enter makes a SCIM token, shown once.
+- The password, the client secret and the token are kept in the store,
+  sealed by the master key when one is set. The settings name them as
+  `store:auth/…`, so each control plane has them with no file put on it.
+  The CA is written into the settings themselves.
+
+**Guardrails…** on a row lists the guardrail policies server.yaml defines.
+Each policy is marked in one of three ways:
+
+- attached here (✓): Enter detaches it;
+- applying from above (·): from everywhere, or from the organization or
+  team named;
+- neither: Enter attaches it.
+
+The **GUARDRAILS** column names those attached to the row itself. Policies
+narrow like limits; see [guardrails.md](guardrails.md).
+
+## Help
+
+**Manual** lists every page there is: these, the installation and operation
+guides, the configuration reference, a page for every command, the README
+and the changes in each release. On a page:
+
+| Key | Does |
+|---|---|
+| ↑ ↓, PgUp PgDn, Space | Scroll |
+| g, G | The top, the end |
+| T | Contents: the page's headings, Enter goes to one |
+| / | Find; the lines holding it are marked |
+| n, N | The next match, the one before |
+| [ ] | The topic before, the one after |
+| ← | Back to the list |
+
+`llmgw docs` opens the same manual outside the console, on any machine,
+installed or not; `llmgw docs install` opens one page; piped, it prints the
+page's text.
+
+## Settings
+
+**server.yaml** (on a node, **agent.yaml**) is every key, as a tree of menus
+built from the configuration reference: the value set, or the one that
+applies when nothing is, its type, and what it is for. Enter changes a value
+or opens a block; on a list or map of blocks, Enter opens an entry and **D**
+removes one. **U** puts a key back to its default. **S** saves.
+
+On a control plane, the cluster's keys are read from and saved to the
+cluster's settings in the store — the same on every control plane, in force
+on all of them within seconds (`llmgw ctl config` does the same from a
+shell) — and this machine's own keys (listeners, certificates, the store's
+address) to its server.yaml, which the server notices and applies by itself.
+Either is checked before anything is kept, and the file's comments survive.
+On a node, agent.yaml is read when the agent starts, so the console offers
+to restart it.
+
+## Do
+
+- **Add a node** — installs llmgw on a machine over ssh, checks it, gives it a
+  certificate and starts its agent (`sudo llmgw node add`).
+- **Replicate the store** — moves the store onto two more machines under
+  Patroni (offered only while it is not replicated).
+- **Serve a model** — Hugging Face's models: trending, most downloaded,
+  most liked or newest (**S** changes which), or **/** to search. **F**
+  switches between GGUF files, which llama.cpp runs on the CPU or a GPU, and
+  original safetensors weights, which vLLM runs on GPUs. Enter on a
+  repository plans it against the cluster as it is, before anything is
+  fetched: the model's shape is read from one file's header, or its
+  config.json, and every file is listed with the best way it runs here — on
+  one card, on several of a node's cards, across several nodes' cards over a
+  fabric (original weights only), or on a CPU node — what each card or node
+  would hold, and whether that hardware is free now. The file that suits the
+  cluster best is first, marked ★; one that fits nowhere says so. Busy is not
+  unfit: which file is best follows the hardware the cluster has, not what it
+  is running, so a file for a card that is in use is still offered for it —
+  served, it waits for the card, or with a fallback runs elsewhere until then. Choosing a
+  file offers every way it fits, best first, and what to do when that one is
+  busy: the next best way, written as a lower-priority profile so placement
+  falls back to it, or wait. A vision model offers its projector too, fetched
+  beside it and loaded with it so the model reads images. What is chosen is
+  fetched into the mirror, checked, added to the catalog and started, and a
+  replica is asked to say hello (`llmgw ctl model serve`; the plan alone is
+  `llmgw ctl model plan`).
+  `mirror.registry` points it at another registry, for a site without the
+  internet.
+- **Upgrade the cluster** to a release: this machine, then every node in turn
+  (`sudo llmgw ctl upgrade`).
+- **Restart all replicas**, one at a time.
+- **Back up now** — the store and `/etc/llmgw` into one archive
+  (`sudo llmgw server backup`).
+- **Wipe this machine** — removes llmgw's services, configuration, state and
+  users from this machine, after listing them and asking for its name
+  (`sudo llmgw wipe`; on a node too).
+- **Leave**.
+
+## The node's console
+
+On a node, `sudo llmgw` opens on **Overview**: what this machine is doing, read
+on the machine itself, so it works without an admin token and while the control
+plane is out of reach. Refreshed every three seconds, it shows
+
+- llmgw-agent's state and since when, and the version of llmgw;
+- each control plane the agent dials, from `agent.yaml` and the list the
+  leader last sent, and whether it can be reached;
+- each GPU: how busy, its memory, its heat, and the models on it;
+- the engines running here, from the agent's own records: replica, model,
+  engine, GPUs, port, whether the process is still there, and for how long;
+- the free space where weights and engines are kept;
+- the agent's warnings and errors of the last hour.
+
+Below it, `agent.yaml` in the same settings view, and the manual. The cluster
+is watched and changed from a control plane.

docs/data.md

@@ -16,20 +16,38 @@ who made a request, when, how many tokens, and what it cost.
 Two features change that, and both are off until somebody turns them on for a
 named project, and neither can be turned on without also saying for how long.
 
-Nothing on the serving path leaves the cluster.
+Nothing on the serving path leaves the cluster — **unless the catalog has a
+model served outside it** (`external:` in a model definition): a request for
+that model, or one that falls back to it, sends its prompt to that provider.
+A guardrail policy with `no_store` refuses both for the scopes it covers.
+
+**Guardrails** read every prompt and answer they are configured for, in the
+gateway's own memory, to judge them. What they record — in the usage row and
+the log — is the action, the policy, the category and how long it took: never
+the text, the value that matched, or the placeholder map of a redaction. See
+[guardrails.md](guardrails.md).
 
 ## What is stored, exactly
 
 **Usage records**, one per request: the key, the project, the model asked for,
 the model that answered, prompt and completion token counts, cost, HTTP status
 and latency. No message content. The row is in `internal/store/store.go` as
-`Usage` and there is no field for text in it.
+`Usage` and there is no field for text in it. What the client chose to say
+about the request is kept with it: OpenAI's `user` field and its `metadata`
+or `x-llmgw-tags` — short strings, set by the client, for attributing spend.
+A client that puts a person's name or address there puts it in the usage
+records; the field is the client's, and so is that choice. Tags are not sent
+on to the engine.
 
 **API keys**, as SHA-256 hashes. The key itself is shown once, at creation, and
 never stored — so a leaked database hands over no working credential, and
 neither llmgw nor an administrator can recover a key somebody lost. A prefix is
 kept so a key can be identified in a listing without revealing it.
 
+**The store's own secrets**, like the one engine keys are derived from, plain
+unless `secrets.master_key` seals them — with Vault's transit engine, so that
+neither the store nor its backups hold them.
+
 **People and tenancy**: accounts, the organisation/team/project tree, and the
 limits attached to it. Passwords are hashed.
 
@@ -37,10 +55,34 @@ limits attached to it. Passwords are hashed.
 
 **Conversations and agent notes** — only for a project that asked. See below.
 
+**Kept requests** — only for a project that asked (`llmgw keys requests`):
+what each request sent the model, after the guardrails' redaction and with
+any stored conversation in it, and the answer the client got, for the hours
+it said, all of them or a share. Never under a `no_store` policy.
+
+**Batch files** — when a client uses the Batch API: the file of requests it
+uploaded (prompts) and the files the batch wrote (answers), in the store,
+until deleted (`DELETE /v1/files/{id}`) or, for what a batch wrote, until
+`router.batch.retain_days` (30) pass. Only keys of the project that made
+them can read them, and a project under a `no_store` policy cannot make
+them.
+
+**Reused answers** — only for a project that asked (`llmgw keys cache`):
+each answer that may be reused, as the client got it, and a hash of the
+request it answers, in the gateway process's memory — never in the store,
+never on disk — for the project's TTL or until pushed out by newer ones
+(`router.cache.max_bytes`), and gone with a restart. Never under a `no_store`
+policy. A project that reuses answers to similar questions (`--similar`)
+also has each question's last user message embedded, and the vector kept
+beside its answer, in the same memory and for as long. Forgetting a person does not reach into it; the answers age out by
+the TTL. The store keeps only the setting, and a usage record's mark that it
+was answered from the cache.
+
 ## What is not stored
 
 Prompts. Completions. Anything the model was shown or produced, unless the
-project turned on conversations or notes.
+project turned on conversations, notes or kept requests, or sent a batch.
+(Reused answers are held in memory only, as above.)
 
 The chat page in llmgw's own web interface keeps the conversation in a
 JavaScript variable in the browser. Refresh it and the conversation is gone,
@@ -86,22 +128,62 @@ your own hardware, and the answer comes back. The router talks to engines, the
 engines talk to nothing, the agents talk to the control plane. All of it is
 inside the cluster.
 
-Two things can reach outside, both started by an operator rather than by a
-request:
+Around the serving path, a cluster set up the ordinary way does reach out.
+None of it carries a prompt, an answer, a key or a user — it is software and
+public model files coming in — but a review should know each one:
 
-**Fetching weights.** When a model's `source` is a URL, the agent downloads it.
-Point that at an internal mirror and nothing leaves at all — which is also the
+**Installing engines.** Each node's agent downloads the llama.cpp build for its
+hardware from GitHub, checked against the checksum GitHub publishes, and vLLM
+(SGLang when asked) from PyPI, with `uv` from GitHub. On every node, when it
+joins and when the engine version changes.
+
+**Releases.** `llmgw node add`, `llmgw ctl upgrade` and `llmgw upgrade` fetch
+llmgw's own release binaries from the project's release server, checked against
+its signed checksums.
+
+**Fetching weights.** When a model's `source` is a URL, the agent downloads it;
+the mirror fetches what it is asked to, from Hugging Face or another URL, and
+`server init` has it fetch the starter model and the guardrails' judge. Point
+sources at the mirror and the nodes fetch only from it — which is also the
 faster arrangement, because eight nodes pulling forty gigabytes from the
 internet is a day's work and from a local mirror it is minutes. A `source` that
 is a path on disk is never fetched.
 
-**`llmgw ctl plan`.** Reads a model's architecture from huggingface.co to work
-out whether it fits your hardware. An operator command run at planning time,
-not part of serving, and not run by anything automatically.
+**The registry.** With a mirror configured, the control plane asks Hugging Face
+every six hours whether the models served from it have newer files
+(`mirror.update_check`), and `/admin/mirror` searches it. `llmgw ctl plan`
+reads a model's architecture from huggingface.co to work out whether it fits
+your hardware.
 
-There is no telemetry, no licence check, and no call home. The binary is
-static, built with `CGO_ENABLED=0`, and runs in a network with no route to the
-internet as long as the weights are already on disk.
+There is no telemetry, no licence check, and no call home.
+
+### A cluster with no way out
+
+A site with no route to the internet installs from an **offline bundle**
+instead, and then nothing at all leaves the cluster (docs/install.md, "Offline
+sites"). The bundle is made on a machine that has internet — llmgw's release
+binaries with their signed checksums, the llama.cpp builds with the checksums
+GitHub publishes, the model files with the checksums Hugging Face publishes,
+each checked as it is downloaded — carried in, and imported into the mirror.
+With `offline.mirror` set in `server.yaml`, nodes install engines from the
+mirror and never from GitHub, releases come from the mirror, and the registry
+is not asked about newer weights.
+
+Verification is not weakened by any of this. A release is held to the project's
+signing key wherever it is fetched from. An engine file is held to the checksum
+recorded when the bundle was made, which the control plane keeps and hands each
+node over the agent's authenticated connection: the mirror serves plain HTTP,
+and nothing a node runs is taken on the mirror's word. The bundle itself is
+checked against the sha256 its maker printed, carried to the site apart from
+the bundle.
+
+What does not come in a bundle: vLLM and SGLang, which are Python environments
+from PyPI — an offline node serves with llama.cpp unless one is installed on it
+by hand — and the operating system's own packages (the OpenMP runtime the
+engine needs, PostgreSQL when chosen), which come from the machines' package
+sources: at an offline site, the distribution mirror it already has. Searching
+the registry from `/admin/mirror` and `llmgw ctl plan` need the internet and
+do not work offline; `mirror.registry` can point the first at an internal copy.
 
 ## What the software cannot do for you
 
@@ -131,3 +213,29 @@ touch, whatever the catalog says.
 | Scope is part of the lookup | `internal/store/threads.go`, `Thread` |
 | Deletion is a client endpoint | `internal/router/threads.go`, `handleDeleteThread` |
 | Weight fetching is the only serving-path egress | `internal/agent/weights/fetch.go` |
+
+## Forgetting a person
+
+`llmgw users forget <email> --yes` (or **Forget them…** in the console) is for
+a request to be forgotten:
+
+- their usage — every request record and every sum — is kept, so totals and
+  budgets stay true, but under a random pseudonym that links to nothing;
+- their kept requests (`keys requests`), personal files and batches, and
+  their own limits are deleted;
+- their email and id are taken out of the audit log, which keeps what was
+  done;
+- then the account goes, as `users delete` removes it: sessions ended, keys
+  revoked and left without an owner.
+
+Conversations and agent notes belong to projects, not to the people in them,
+and are not touched: a project forgets them by its retention, and a thread by
+`DELETE /v1/threads/{id}`. Backups taken before still hold everything until
+they age out; that is what their retention is for.
+
+## Keeping a project's requests in the cluster
+
+`llmgw keys residency --project <path> --in-cluster` refuses the project's
+keys any model served by an outside provider, and never uses one for them as
+a fallback or a canary: their prompts do not leave the machines the cluster
+runs on. `--anywhere` lifts it.

docs/development.md

@@ -1,8 +1,9 @@
-# Quickstart: one machine, one model, ten minutes
+# Development: llmgw from source on one machine
 
 Written for a developer who wants to see llmgw answer a request on a single
-workstation, built from source, with no systemd and no `sudo`. **To install
-llmgw on servers, read [quick-install.md](quick-install.md) instead.**
+workstation, built from source, with no systemd and no `sudo` — for working on
+llmgw itself. **To install llmgw on servers, read
+[quick-install.md](quick-install.md) instead.**
 
 What you end up with: an OpenAI-compatible endpoint on `localhost:8080` in front
 of a real model served by llama.cpp.
@@ -26,7 +27,7 @@ make test
 ./bin/llmgw --version
 ```
 
-`make build` writes `./bin/llmgw`. Go 1.26 or later is the only requirement.
+`make build` writes `./bin/llmgw`. Go 1.26.6 or later is the only requirement (an older Go fetches it itself).
 
 ## 2. Check the path with a fake engine
 

docs/facility-aware-placement.md

@@ -1,13 +1,109 @@
 # Facility-aware placement: rack power, temperature and cooling
 
-**Status: step 0, reading the nodes' own sensors, is built; steps 1–5 are
-deferred** until the rack, PDU and power information of a real site is at
-hand — without it they would be designed against guesses.
-This is the design for step 5 of resource allocation, after reserved CPU cores
-and memory (1), capacity classes and preemption (2), tenant capacity quotas (3)
-and sizing by measured throughput (4), all of which shipped in v0.10.5. Of
-what follows, only the node sensors (rollout step 0) exist in the code: they
-are read, published and shown, and change no decision.
+**Status: steps 0, 1 and 2 are built, with the manual hold of step 4;
+temperature conditions (steps 3 and 4) and shedding (step 5) are not**,
+until the thermal data of a real site is at hand — without it thresholds would
+be designed against guesses. This is the design for step 5 of resource
+allocation, after reserved CPU cores and memory (1), capacity classes and
+preemption (2), tenant capacity quotas (3) and sizing by measured throughput
+(4). [What is built](#what-is-built) says what works today and where it
+departs from the design below; the rest of the document is the design.
+
+## What is built
+
+**Where a node is.** Five labels: `llmgw.io/site`, `room`, `row`, `rack` and
+`pdu` (a comma separated list, for a dual-fed rack). They come from the node's
+`agent.yaml` under `labels:`, or from the control plane:
+
+```
+llmgw ctl label gpu01 llmgw.io/rack=r12-07 llmgw.io/pdu=r12-07-a,r12-07-b
+llmgw ctl label gpu01 llmgw.io/rack-        # back to agent.yaml's value, if any
+```
+
+Labels set with `ctl label` are kept in the store, win over the agent's, and
+may be set before the node joins. A misspelt `llmgw.io/` key is refused. A
+domain is named `level:name` — `rack:r12-07`, `pdu:r12-07-a` — and names are
+taken as given, so two rooms that both have a rack `r1` must label them apart.
+A node without location labels is in no domain and places as it always did.
+
+**Spreading.** A model's next replica goes first to a node sharing no rack and
+no PDU with the nodes the model already runs on; nodes sharing fewer come
+before nodes sharing more. It is an ordering, never a filter: a rack holding
+the only free cards still takes the replica. It ranks above preferring a node
+that already holds the weights — a second replica one breaker away from the
+first is worth less than the copy saved — and above bin packing.
+
+**Keeping a replica together.** A profile's `keep_within: rack` (or `row`,
+`room`, `site`) keeps a multi-node replica's nodes in one such domain, inside
+the fabric or NVLink domain placement already requires; nodes without the
+label are passed over for it, with the reason.
+
+**Holds.** `llmgw ctl facility hold rack:r12-07 --reason "PDU swap"` places
+nothing new in the domain, as a cordon of each of its nodes would, including
+nodes labelled into it later. `--drain` also drains its nodes, one replica at
+a time with the replacement up first; `llmgw ctl facility release` undoes
+both. Holds are kept in the store across restarts (the drain itself is node
+state, which is not: after a restart the hold still keeps work out, and
+replicas not yet moved stay where they are). Any domain can be held: a PDU
+holds every rack on it.
+
+**Power budgets.** In `server.yaml`:
+
+```yaml
+facility:
+  margin: 0.1            # share of every cap kept free
+  gpu_watts: 700         # a card that reports no power limit
+  cpu_core_watts: 10     # a core reserved by a CPU replica (cpu_cores)
+  node_watts: 350        # each node's own draw beyond its cards
+  budgets:
+    - domain: rack:r12-07
+      cap_watts: 16000   # what one feed carries alone, derated
+      other_watts: 800   # switches, storage
+    - domain: pdu:r12-07-a
+      cap_watts: 7400
+```
+
+A replica's draw is the profile's `power_watts` (split over its nodes) when
+declared; otherwise each card at the power limit it reports through the agent's
+sensors (or `gpu_watts`), and each reserved core at `cpu_core_watts`. A
+domain's use is, node by node, `node_watts` plus the larger of what is placed
+there and what the node's sensors read in the last two minutes
+(`measured_fresh`), plus the domain's `other_watts`. A shard that would take
+any of its node's domains past `cap × (1 − margin)` is refused; a multi-node
+replica's shards are counted together, so two that each fit a rack alone do not
+both go into it. A draw nobody knows — no declared figure, no card limit, no
+`gpu_watts` — counts as nothing: missing data never blocks.
+
+**What people see.** `llmgw ctl explain-placement` names the domain: *rack
+r12-07 is held: PDU swap*, *rack r12-07: 14.2 kW of a 14.4 kW limit (16.0 kW
+cap less 10%) in use, the shard needs ~2.8 kW*. The rejections of a placed
+replica are kept too, so a replica in an unexpected rack says why. `llmgw ctl
+nodes` has a LOCATION column, shows *ready, held*, and filters with `--domain
+rack:r12-07`. `llmgw ctl facility` lists every domain with its nodes, use,
+limit, reserved and measured draw, and holds. The console's Nodes view has a
+WHERE column; a node's page shows its location and hold, and its menu sets
+the location (**Location…**) and holds or releases its rack. The admin API:
+`GET /api/v1/facility`, `POST /api/v1/facility/holds`, `DELETE
+/api/v1/facility/holds/{domain}`, `POST /api/v1/nodes/{id}/labels`.
+
+**Where it departs from the design below, and why.**
+
+- Domains come from labels alone; there is no facility file declaring them.
+  Budgets are in `server.yaml`, the one file the control plane already reads.
+  A DCIM export would generate that block.
+- Feeds are not modelled. The cap given is what one feed carries alone,
+  derated — the figure the design says matters — so the operator gives the
+  one number instead of llmgw deriving it from two.
+- The manual hold of step 4 is built now, without conditions: it needs no
+  sensor data and answers the commonest facility event, planned maintenance.
+  Its command is `ctl facility hold`, with a `--drain` the design did not have.
+- `keep_within` is new: the request that a multi-node replica stay in one rack
+  where the cabling requires it.
+- Spreading is an ordering of candidates, not the scoring of the design; power
+  headroom does not yet order racks ("level load across racks"), and
+  multi-node replicas are not spread across racks.
+- No `llmgw_domain_*` metrics or alerts yet; `ctl facility` and the API carry
+  the same figures.
 
 ## Why
 
@@ -260,16 +356,17 @@ Each step ships on its own and is useful without the next:
 0. **Node sensors, observe-only (built).** GPU heat, power and throttling,
    CPU heat and power, inlet air where the board has a sensor; published and
    shown, no decision changed.
-1. **Location and spreading.** Well-known labels, domains from labels, replicas
+1. **Location and spreading (built).** Well-known labels, domains from labels, replicas
    spread across racks and PDUs, locations on the node views. No facility data
    needed.
-2. **Power budgets from a static file.** Caps and margins, estimated draw per
+2. **Power budgets from a static file (built, without headroom
+   scoring).** Caps and margins, estimated draw per
    replica (declared or derived), hard limit in placement and headroom.
 3. **Readings, observe-only.** The Prometheus source beside the agents',
    conditions with hysteresis (throttling first among them), measured power
    folded into headroom; decisions shown, not enforced.
-4. **Thermal enforcement.** `warm` scored down, `hot` refused, manual hold and
-   release.
+4. **Thermal enforcement.** `warm` scored down, `hot` refused; the manual hold
+   and release are built.
 5. **Shedding and tokens per watt.** Opt-in shedding through step 2's
    preemption; measured power in profile preference.
 

docs/guardrails.md

@@ -0,0 +1,390 @@
+# Guardrails
+
+Written for the operator deciding what the gateway lets through: what a
+policy can check, what it can do, and how one is attached to a team.
+
+`llmgw server init` writes a `baseline` policy that applies to every
+request, with Qwen3Guard-Gen 0.6B as its judge on CPUs; see
+[install.md](install.md#2-the-control-plane) for what it checks. The
+policies are part of the cluster's settings, kept in the store: `llmgw ctl
+config edit` (or the console's Settings) changes them, and the change is in
+force on every control plane within seconds, without a restart. A cluster
+whose settings were brought in from a server.yaml without a `guard:` section
+gets the `baseline` policy, without a judge. With no policies, nothing is
+checked and nothing costs anything. With one, every request is judged once it is authorised and
+within its limits, with its stored conversation spliced in, and before it is
+sent to a model; and the answer is judged before the client sees it.
+
+## Turning them off and on
+
+```
+llmgw ctl guard off --note "why"   # no request is checked, whatever the policies say
+llmgw ctl guard on                 # every policy checks again, as it was
+```
+
+That is `guard.enabled` in the cluster's settings, in force on every control
+plane within seconds without a restart. The policies and where they are
+attached are kept. While off, `llmgw ctl status`, `llmgw ctl guard list` and
+the guardrails page say so. To stop one policy rather than all, give it
+`mode: off`, or `mode: shadow` to have it record what it would do.
+
+## A policy
+
+```yaml
+guard:
+  # Applied to every request.
+  default: [baseline]
+  policies:
+    baseline:
+      input:
+        pii: {secret: block, card: redact}
+        injection: flag
+      output:
+        pii: {secret: block}
+    finance:
+      mode: enforce          # enforce (default), shadow, off
+      fail: closed           # open (default) or closed, for checks that can fail
+      no_store: true         # no conversations, notes, prefix routing or external models
+      max_output_tokens: 2048
+      system_prompt: "You answer questions about Acme's products only."
+      drop_client_system: true
+      stream: sentence       # sentence (default) or buffer_all
+      require_capabilities: true   # no tools/images to models whose catalog entry lacks them
+      validate_structured: true    # answers must fit response_format's json_schema
+      input:
+        pii: {email: redact, phone: redact, iban: block, tckn: redact}
+        injection: block
+        max_chars: 40000
+        deny:
+          - {name: codename, regex: "(?i)project falcon", action: block}
+      output:
+        pii: {iban: redact, tckn: redact, secret: block}
+      tools:
+        allow: [search, fetch]
+        deny: [shell]
+        on_denied: strip     # strip (default) or block
+        max_calls_per_turn: 4
+        validate_arguments: true
+```
+
+**What is found.**
+
+- **Personal data:** email, phone, iban, card, tckn, ip. Each is checked
+  before it counts: IBANs by their mod-97 check, cards by Luhn and issuer
+  prefix, TCKNs by their two check digits, phone numbers only when written
+  to be dialled (`+90…`, `00…`, `0532…`).
+- **Secrets** (`secret`): OpenAI- and Anthropic-style keys, AWS access key
+  ids, GitHub, Slack and Google tokens, JWTs, PEM private keys and llmgw's
+  own keys.
+- **Prompt injection:** instructions to drop instructions (English and
+  Turkish), chat-template control tokens in user text, invisible Unicode,
+  long encoded blobs. These are found through disguises: fullwidth letters,
+  Cyrillic look-alikes, zero-width characters, and base64, hex and URL
+  encoding two levels deep.
+- **`deny` patterns:** matched against the text as written, and as a model
+  reads it once those disguises are removed.
+
+**What is done.**
+
+- **`flag`** lets the request through and records it.
+- **`redact`** rewrites the value as a placeholder (`[EMAIL_1]`; the same
+  value is the same placeholder throughout a request).
+- **`block`** stops it.
+
+**Putting them back.** With `restore: true` in a policy's `input`, the
+values a request had redacted are put back in its answer: the model reads
+"write to [PERSON_1] at [EMAIL_1]", the client reads the name and address
+it sent. Streamed answers too — a placeholder split across two events is
+held until it is whole. Only that request's own values, only into its
+answer; the map is kept in memory for the request and nowhere else. The
+output rules then read the answer as the client will, so a policy that
+redacts personal data in answers still does.
+
+```yaml
+input:
+  pii: {email: redact, phone: redact}
+  restore: true
+```
+
+**Shapes.**
+
+- `system_prompt` is put first.
+- `drop_client_system` removes the caller's own system and developer
+  messages.
+- `max_output_tokens` is set where a request asks for none, and lowers one
+  that asks for more.
+- A tool `deny`/`allow` list strips the tool from the request, or refuses
+  it.
+- In the answer, a call to a tool that is not allowed, more calls than
+  `max_calls_per_turn`, or arguments that do not fit the parameters the
+  request declared (`validate_arguments`) stop it.
+- `require_capabilities` refuses tools offered to a model whose catalog
+  entry does not say `capabilities.tools`, and images to one without
+  `capabilities.vision`. It is opt-in because an entry that says nothing is
+  read as "cannot".
+- `validate_structured` checks an answer against the `json_schema` the
+  request asked for in `response_format`. Buffered, or streamed with
+  `buffer_all`, an answer that does not fit is stopped; streamed a sentence
+  at a time it has gone out already, and is flagged.
+
+## A judge model
+
+Patterns find what has a shape. For what does not — violence, crime,
+sexual content, self-harm, jailbreaks, whatever a moderation model was
+trained on — a policy can have a **judge model on the cluster** read the
+text.
+
+The judge must be in the catalog under the name the policy gives, as a
+judge (`role: guard`), with a replica ready. When it is not, what the
+policy judges is refused with `guard_unavailable` (`fail: closed`) or served
+unjudged (`fail: open`), and `llmgw ctl status` and the console's Overview
+say which judge and why.
+
+### Which judge
+
+| judge | runs on | size | |
+|---|---|---|---|
+| `qwen3guard-0.6b` | CPUs | 0.8 GB | the default: about 2 s a check on two threads |
+| `qwen3guard-4b` | a GPU | 2.5 GB | for a cluster with a card to spare |
+| `qwen3guard-8b` | a GPU | 4.7 GB | |
+| `llama-guard-3-1b` | CPUs | 0.9 GB | the earlier default: refuses ordinary coding requests |
+| `llama-guard-3-8b` | a GPU | 4.6 GB | |
+
+Measured on the reference cluster, as the judge's probability of "unsafe"
+for ordinary coding requests against harmful ones, Llama Guard 3 1B could
+not tell them apart: "continue" 0.51, "continue the code above" 0.89, "how
+do I kill all child processes in bash" 0.92, against 0.97 to 1.00 for
+harmful requests, at any quantisation. Qwen3Guard-Gen 0.6B gave the
+ordinary ones 0.15 at the most and the harmful ones 1.00. Its verdicts are
+safe, unsafe and **controversial**; controversial counts as safe unless the
+policy says `controversial: unsafe`.
+
+A policy that names one of these is enough: the leader fetches its weights
+into the mirror and serves it as a judge, and serves it again if it is
+removed from the catalog. Another judge is served by hand with `--repo`.
+
+```
+llmgw ctl guard judge status              # each judge the policies ask, and what is wrong with it
+llmgw ctl guard judge enable              # Qwen3Guard-Gen 0.6B on CPUs, or the judge the policies ask that is missing
+llmgw ctl guard judge enable --gpu        # Qwen3Guard-Gen 4B on a GPU
+llmgw ctl guard judge use qwen3guard-4b qwen3guard-0.6b   # the order every policy asks them in
+llmgw ctl guard judge enable --replace    # when a model of that name is there, but not as a judge
+```
+
+or **Do → Serve the guardrails' judge** in the console.
+
+### A GPU and CPUs together
+
+`judge.models` is a list asked in turn: the first judge that answers gives
+the verdict. The next is asked when one has no replica serving, fails, or
+does not answer within `latency_budget`; a judge with no replica at all is
+passed over at once. A judge on a GPU first and one on CPUs after it is
+the GPU's speed while it has its card, and the CPUs' when it does not.
+
+```yaml
+judge:
+  models: [qwen3guard-4b, qwen3guard-0.6b]
+  input: block
+  output: block
+  latency_budget: 5s           # each judge's wait
+```
+
+A judge on a GPU is served as a `standard` model, on one card: it takes a
+card only from what may give one up, and waits while every card is busy,
+the judge on CPUs standing in. A judge on CPUs is `critical`, with two
+replicas, because every judged request waits on one. `llmgw ctl guard judge
+status` says, for each judge, which is asked when it gives no verdict.
+
+### When it refuses ordinary requests
+
+A refusal by a judge names the hazard it saw — the client is told `refused
+by the gateway's policy (judge: Violent)` — and the same is kept with the
+request: `llmgw ctl request <id>`, the server's log (`guard_rule`) and the
+guardrails page show it. To see what the judge says of any text, without
+anything being kept:
+
+```
+llmgw ctl guard judge ask 'How do I sort a list in Python?'
+# qwen3guard-0.6b: safe, 1900 ms
+# it answered: "Safety: Safe\nCategories: None"
+```
+
+A judge that says `unsafe` to ordinary text is usually Llama Guard 3 1B
+(`llmgw ctl guard judge use qwen3guard-0.6b`), the wrong weights (another
+repository's, without the judge's template: `judge enable --replace` serves
+the right ones), or a policy counting every category: give its judge
+`categories`. The baseline counts Violent, Non-violent Illegal Acts, Sexual
+Content or Sexual Acts, Suicide & Self-Harm and Jailbreak; PII is the
+patterns', and copyright, unethical acts and politically sensitive topics
+refuse too much ordinary work. While finding out, `judge.input: flag`
+records instead of refusing.
+
+A judge's file served from the mirror page — Llama Guard, Qwen3Guard,
+ShieldGemma — is served as a judge too, under the name the policies ask.
+By hand, the catalog entry is:
+
+```yaml
+# a catalog model (server.yaml models:, or ctl model add)
+- name: qwen3guard-0.6b
+  source: http://mirror:8081/qwen3guard-0.6b/…/Qwen3Guard-Gen-0.6B.Q8_0.gguf
+  role: guard
+  guard:
+    format: qwen3guard         # qwen3guard, llamaguard3, shieldgemma or json
+  scaling: {min: 2, max: 2}
+  profiles: [{name: cpu, engine: llamacpp}]
+
+# in a guard policy
+judge:
+  models: [qwen3guard-0.6b]    # or model: one judge
+  input: block                 # flag or block; empty does not ask about input
+  output: flag
+  categories: [Violent, Jailbreak]   # only these count; empty: any unsafe verdict
+  controversial: safe          # or unsafe
+  latency_budget: 250ms        # each judge's wait; after the last, fail: open serves (flagged), closed refuses
+```
+
+A model with `role: guard` is the guardrails' alone:
+
+- it is not in `/v1/models` or the chat page, and is refused (404) to
+  every key, as a name and as a fallback;
+- it must always run — on demand is refused. One on CPUs is `critical`
+  and should have two replicas on different nodes, because every judged
+  request waits on it.
+
+The gateway's calls to it go past admission, accounting and the guardrails
+themselves.
+
+- **Formats:**
+  - `qwen3guard` asks in Qwen3Guard's own words and reads "Safety: Safe |
+    Unsafe | Controversial" and its "Categories:".
+  - `llamaguard3` reads Meta's "safe" / "unsafe\nS1,S10"; give the catalog
+    entry `categories` to have S1 recorded as its name.
+  - `shieldgemma` asks Google's model whether the text breaks the listed
+    principles (`categories`, each a sentence) and reads Yes or No.
+  - `json` expects `{"safe": false, "categories": [...]}`.
+- **What is read:**
+  - **Input:** the request's last user turn, after the patterns.
+  - **Output:** the answer, together with that user turn. A streamed answer
+    is read every 600 characters and at the end, so text between two
+    readings has gone out already; `stream: buffer_all` holds it until it
+    is read.
+  - **A long text** is read by its start and its end (about 6000
+    characters), so a message with a file pasted into it fits the judge's
+    context rather than overflowing it and going unjudged.
+- **Cache:** the same text is not asked about twice within five minutes.
+
+## An outside service
+
+A site required to use a particular guardrail — Azure Content Safety,
+Lakera Guard, NeMo Guardrails, a classifier of its own — names it in a
+policy's `services`. It is asked over HTTP beside the patterns and before
+the judge; its "unsafe" blocks or flags like theirs, and a service that does
+not answer is what the policy's `fail` says.
+
+```yaml
+policies:
+  strict:
+    fail: closed
+    services:
+      - name: lakera
+        url: https://api.lakera.ai/v2/guard
+        header_files: {Authorization: /etc/llmgw/secrets/lakera}   # "Bearer …", read each call
+        body: '{"messages": [{"role": "user", "content": {{json .Text}}}]}'
+        blocked: flagged                 # where the answer says unsafe
+        reason: breakdown.0.detector_type
+        on: both                         # input, output or both
+        action: block                    # or flag
+        timeout: 2s
+```
+
+`body` is a template given `.Text` (`{{json .Text}}` writes it as a JSON
+string; empty sends `{"input": …}`). `blocked` and `reason` are dotted paths
+into the JSON answer, numbers for list items; true, a number above zero, a
+non-empty list or a string other than "false" is unsafe. On input the
+service reads the latest user turn as the model will, with what `redact`
+took out still out; on output the whole answer, once, at its end, as the
+client reads it — with `restore`, the values put back. Being at the end, a
+service can stop a streamed answer only where it is held back
+(`stream: buffer_all`): released a sentence at a time, the client has read
+it by then, and what the service finds ends the stream with
+`content_filter`, flags it and is recorded. The rule recorded is
+`service:<name>:<reason>`. The service is told the text only, never who
+sent it. Under `fail: open`, the default, a service that cannot be asked
+lets the text through — and a caller can make it fail, sending what it
+refuses to read; give `fail: closed` where the service must decide. Of an
+answer asked for with `n` above 1, the service reads the first.
+
+## Where a policy applies
+
+`guard.default` applies everywhere. Others are attached to a part of the
+tenancy tree, and apply to everything below it:
+
+```
+llmgw ctl guard attach project:Acme/finance/payroll finance
+llmgw ctl guard attach key:key-7f3a baseline
+llmgw ctl guard list
+llmgw ctl guard detach project:Acme/finance/payroll finance
+```
+
+Policies narrow, as limits do. A policy attached lower can tighten what
+applies above it, never loosen it. Combined, they take:
+
+- the strictest mode and failure;
+- for each kind, the strictest action;
+- every deny pattern and denied tool;
+- only the tools every allow list allows;
+- the smallest limits;
+- `no_store` if any of them asks;
+- every pinned prompt, widest first.
+
+An attachment applies at once.
+
+## What a client sees
+
+**A refused request** is answered with 400:
+
+```json
+{"error": {"type": "invalid_request_error", "code": "content_policy_violation",
+           "message": "this request was refused by the gateway's policy (secret)"}}
+```
+
+It names the category, never the text, and costs nothing.
+
+**A stopped answer** ends with `finish_reason: "content_filter"`. A stream
+ends with that chunk and `[DONE]`, and the engine is cancelled. The
+Responses API reports it as `incomplete` with
+`incomplete_details.reason: "content_filter"`.
+
+**Headers:** `x-llmgw-guard` (`flagged`, `redacted`, `blocked`) and
+`x-llmgw-guard-policy` say what was done.
+
+**Streams.** A streamed answer is judged a sentence at a time. Text is held
+until a sentence, a line or 200 characters ends, released up to its last
+whitespace — so a value still arriving is never sent in two halves — and
+rewritten if needed. **What was released cannot be taken back**: a policy
+that must never let a word through uses `stream: buffer_all`, which holds
+the whole answer until it is judged.
+
+## Shadow mode
+
+`mode: shadow` judges and records — the usage row says `shadow-blocked`,
+`shadow-redacted` — and changes nothing. Run a new policy in shadow first,
+and read what it would have done before enforcing it.
+
+## What is recorded
+
+Each request's usage row has the action, policy, category and the time the
+checks took. The access log has the action, stage and policy. Neither has
+the text, a matched value, or the placeholder map: the map exists only in
+the gateway's memory while the request is served.
+
+## In the console
+
+`sudo llmgw` has a **Guardrails** view: each policy with its mode, what it
+does when it cannot judge, and what it checks; whether each judge model it
+leans on has replicas ready — a policy that fails closed refuses everything
+while its judge has none; where policies are attached, with A to attach one
+and Enter on a row to detach it; and what they did in the last day (W for an
+hour or a week), totals first and the newest requests after, each with the
+request id `llmgw ctl request` reads. The same is at `GET /api/v1/guard` and
+`GET /api/v1/guard/events?since=24h`, and on the portal's Guardrails page.

docs/knowledge.md

@@ -0,0 +1,426 @@
+# Knowledge bases
+
+A knowledge base is a collection of a company's documents that the cluster
+can answer from. People put their documents into it from their own machines
+with `llmgw-kb`. The tool reads the files on that machine, cuts them into
+passages ("chunks"), has the gateway embed each passage with the person's own
+key, and sends the text and the vectors. The files themselves never leave
+the machine.
+
+## Why retrieval, and not training
+
+Retrieval is the tool for *knowledge*: policies, procedures, contracts. The
+answer can name its source, a changed document is sent again in minutes, and
+a passage only ever reaches people allowed to read its collection.
+
+Training a model on the documents (LoRA) changes how it *writes*, not what it
+reliably *knows*. It has no access control: whatever goes into the weights
+is available to everyone who may use them.
+
+## What it needs
+
+- **The PostgreSQL store with pgvector.** On a SQLite store knowledge bases
+  are off, and `llmgw ctl kb list` and the console say why.
+  - `llmgw server init` and the high-availability database setup install
+    pgvector and enable it.
+  - A cluster set up before this build needs it by hand, once:
+    1. Install the package on every database machine:
+       `sudo apt-get install postgresql-16-pgvector` (use the server's
+       version number).
+    2. On the leader, enable it in llmgw's database:
+       `sudo -u postgres psql -d llmgw -c 'CREATE EXTENSION vector'`.
+    3. Restart the control planes: `llmgw restart`.
+- **An embedding model in the catalog**, with `capabilities.embeddings`.
+  Two good choices handle Turkish and run on CPUs: `BAAI/bge-m3` (1024
+  dimensions) and `Qwen/Qwen3-Embedding-0.6B`.
+
+  Add it as any model is added (**Serve a model** in the console, or the
+  catalog), with its entry saying that it embeds:
+
+  ```yaml
+  capabilities:
+    embeddings: true
+  ```
+
+  A collection stays with the model it was made with: vectors from two
+  models cannot be compared.
+
+  Some embedding models are trained with an instruction before the
+  question and none before the documents. Give it as the entry's
+  `query_prefix`; llmgw puts it before questions only. For
+  Qwen3-Embedding:
+
+  ```yaml
+  query_prefix: "Instruct: Given a web search query, retrieve relevant passages that answer the query\nQuery: "
+  ```
+
+  With pgvector 0.7 or later a collection's index is kept at half
+  precision (`halfvec`), which halves its memory and takes models of up to
+  4000 dimensions; with an older pgvector the limit is 2000. A collection
+  keeps the kind it was made with.
+
+## For administrators
+
+### Make a collection
+
+A collection belongs to one part of the tenancy tree: an organization, a
+team, a project or a person. Whoever is in the owner, at any level below it,
+may read it and add to it.
+
+```sh
+llmgw ctl kb create team:Acme/hr policies bge-m3
+llmgw ctl kb create user:USER-ID notes bge-m3 --org Acme
+```
+
+The model's dimension is asked of the model itself, so the model has to be
+able to serve when the collection is made. `--dims 1024` gives it instead.
+
+In the console: **Knowledge**, then **A**.
+
+### Who may read and add
+
+The owner, and everything below it, may read and add. A **grant** gives the
+same to another part of the same organization, to a person, or to one key:
+
+```sh
+llmgw ctl kb grant Acme/policies project:Acme/sales/crm           # read
+llmgw ctl kb grant Acme/policies team:Acme/legal --write          # read and add
+llmgw ctl kb revoke Acme/policies project:Acme/sales/crm
+```
+
+How access works:
+
+- **Grants add up down the tree.** A grant to a team reaches its projects
+  and their keys.
+- **Nothing crosses organizations.** A grant to another organization's
+  team, project, key or person is refused.
+- **A person's own key** (a key with no project) reads nothing by itself.
+  The person names the project they act in (`llmgw-kb login` asks for it,
+  or `--project`) and must be a member of it. Joining a second team
+  therefore does not quietly widen what every key of theirs can read.
+- **No access looks like no collection.** A collection a key may not read
+  is answered exactly as one that does not exist, so even its name does not
+  leak.
+
+### Answer from collections by default
+
+Clients that cannot add a header still get answers from the documents when
+their part of the tree has a default:
+
+```sh
+llmgw ctl kb default team:Acme/hr Acme/policies Acme/forms
+llmgw ctl kb default key:KEY-ID Acme/policies
+llmgw ctl kb default team:Acme/hr --clear
+```
+
+- **Which default applies.** The narrowest one: a key's over its project's,
+  a project's over its team's, a team's over its organization's.
+- **A request can override it.** A request that names collections uses
+  those instead, and `X-Llmgw-Knowledge: none` turns the default off for
+  that request.
+- **A default never refuses a request.** A collection the caller may not
+  read is left out for them. If the search fails (the embedding model is
+  down, say), the request is answered without passages and the failure is
+  logged.
+- **Changes take effect within 30 seconds.**
+
+In the console: **Knowledge**, Enter on a collection, then **Answer from it
+by default…**.
+
+### Look after it
+
+```sh
+llmgw ctl kb list                          # collections, owners, documents, grants
+llmgw ctl kb docs Acme/policies            # its documents, who added each and when
+llmgw ctl kb rm Acme/policies old/form.pdf # one document out
+llmgw ctl kb search Acme/policies how many days of annual leave
+llmgw ctl kb delete Acme/policies          # the collection, its documents and grants
+```
+
+Rules that apply:
+
+- A project, team or organization that owns a collection is not deleted
+  until its collections are. This is the same rule as for one with members.
+- A person's own collections go with their account (`users delete`,
+  `users forget`).
+- Every document added or removed is in the audit log (`llmgw ctl audit`),
+  by name. The text is never recorded.
+
+### A large import
+
+A few thousand documents ask the embedding model for far more than it can
+answer at once. Give the key that sends them a band of its own, below the
+people's, that may wait for room for minutes rather than the 30 seconds the
+others wait:
+
+```sh
+llmgw ctl config set router.admission.bands '[{name: gold, priority: 300, saturation_ceiling: 0.85},
+  {name: bronze, priority: 100, saturation_ceiling: 0.3}, {name: bulk, priority: 50, saturation_ceiling: 0.3, queue_ttl: 5m}]'
+llmgw keys create import --project Acme/docs --band bulk
+```
+
+The people's questions then go first, and the import waits behind them. A
+request that waits as long as its band allows is answered 504 with
+`Retry-After`, and `llmgw-kb` sends it again rather than counting the
+passage as failed. It gives up after 15 minutes.
+
+## For everyone: `llmgw-kb`
+
+### Get it
+
+Download `llmgw-kb` for your system from the release page, next to `llmgw`:
+
+| System | File |
+|---|---|
+| Windows (Intel/AMD) | `llmgw-kb-VERSION-windows-amd64.exe` |
+| Windows (ARM) | `llmgw-kb-VERSION-windows-arm64.exe` |
+| macOS (Apple silicon) | `llmgw-kb-VERSION-darwin-arm64` |
+| macOS (Intel) | `llmgw-kb-VERSION-darwin-amd64` |
+| Linux | `llmgw-kb-VERSION-linux-amd64` / `-arm64` |
+
+Rename it to `llmgw-kb` (`llmgw-kb.exe` on Windows) and put it somewhere on
+your PATH. You do not need to install anything else.
+
+On macOS, a downloaded program that is not signed is stopped the first time.
+Either right-click it and choose Open, or run
+`xattr -d com.apple.quarantine llmgw-kb`.
+
+### Log in once
+
+```sh
+llmgw-kb login
+```
+
+It asks for three things, checks them, and saves them where only you can
+read them:
+
+- **The gateway's address.**
+- **Your API key.** It is typed without being shown.
+- **A project.** Needed only for a personal key.
+
+Instead of logging in you can set `LLMGW_URL`, `LLMGW_API_KEY` and
+`LLMGW_PROJECT`.
+
+```sh
+llmgw-kb collections        # what your key may read, and which you may add to
+```
+
+### Send your documents
+
+```sh
+llmgw-kb sync policies ~/Documents/HR
+llmgw-kb sync policies "C:\Users\ayse\Documents\İK" --include "*.pdf,*.docx"
+llmgw-kb sync policies ./handbook ./forms --exclude "drafts/**"
+```
+
+Run it as often as you like. The first run sends everything. Later runs
+send only what changed, and do not even read files whose size and time have
+not changed.
+
+| Option | What it does |
+|---|---|
+| `--dry-run` | Reads and cuts everything, sends nothing, and lists what would leave the machine and how much. |
+| `--delete` | Also removes documents whose files are gone. Only those this machine sent, from these folders; never anything someone else sent. |
+| `--retry` | Reads again files skipped before, for example after installing LibreOffice. |
+| `--include`, `--exclude` | Glob patterns. `*.pdf` matches a file name; `reports/**/*.xlsx` matches a path. |
+| `--hidden` | Reads hidden files and folders too (left out by default). |
+| `-v` | Lists unchanged files too. |
+
+Documents are named by their path under the folder, with forward slashes,
+on every system. With several folders, each folder's own name comes first.
+
+```sh
+llmgw-kb status policies    # what this machine sent and skipped, and why
+llmgw-kb history            # the latest runs
+llmgw-kb formats            # what can be read here
+```
+
+### What it reads
+
+| Read here | Formats |
+|---|---|
+| Documents | PDF (text), Word (`.docx`), Excel (`.xlsx`), PowerPoint (`.pptx`, with speaker notes), OpenDocument (`.odt`, `.ods`, `.odp`), RTF, EPUB |
+| Web and mail | HTML, MHTML, e-mail (`.eml`, with its attachments) |
+| Text | Markdown, plain text, CSV, JSON, YAML, XML, subtitles, notebooks (`.ipynb`), source code |
+| Archives | ZIP, with every file inside it read in turn |
+
+| Read with a helper on your machine | Helper |
+|---|---|
+| Word, Excel and PowerPoint 97–2003 (`.doc`, `.xls`, `.ppt`), Pages, Numbers, Keynote and others | [LibreOffice](https://www.libreoffice.org) |
+| Images and scanned PDFs | [Tesseract](https://tesseract-ocr.github.io) (with the Turkish language data), plus Poppler's `pdftoppm` for PDFs |
+| PDFs the built-in reader cannot parse | Poppler's `pdftotext` |
+
+`llmgw-kb formats` says which helpers it found. Text in UTF-8, UTF-16, or
+the Windows Turkish and Western code pages is read correctly.
+
+A file that cannot be read is skipped with the reason, and the run goes on.
+Reasons include a locked Office file, a format with no helper, and a
+scanned page with no OCR.
+
+### What leaves your machine
+
+For each new or changed document, two things leave the machine, both over
+the gateway's TLS connection:
+
+- **The passages, to be embedded.** They go through `/v1/embeddings` like
+  any request of yours. Your key's limits, budget and guardrails apply.
+- **The document itself.** Its name, its file's SHA-256 digest and size,
+  and the passages with their vectors.
+
+The file itself is never sent. `--dry-run` shows exactly what would be.
+
+### The ledger
+
+`llmgw-kb` keeps a small SQLite database of what it did with every
+document: the file it came from, its size, time and digest, and whether it
+was sent, skipped or failed, with the reason.
+
+| System | Where it is |
+|---|---|
+| Windows | `%AppData%\llmgw-kb\ledger.db` |
+| macOS | `~/Library/Application Support/llmgw-kb/ledger.db` |
+| Linux | `~/.config/llmgw-kb/ledger.db` |
+
+Deleting the ledger is safe: the next run hashes every file once, finds what
+the collection already has, and sends nothing that is unchanged. `--ledger`
+uses another file.
+
+## Asking questions of a collection
+
+A chat request names the collections to answer from in a header. Any client
+that can add a header can do it: the OpenAI and Anthropic SDKs, Continue, or
+curl.
+
+```sh
+curl https://llm.example.com/v1/chat/completions \
+  -H "Authorization: Bearer $LLMGW_API_KEY" \
+  -H "X-Llmgw-Knowledge: politikalar" \
+  -d '{"model": "qwen2.5-coder-14b-instruct",
+       "messages": [{"role": "user", "content": "Kaç gün yıllık iznim var?"}]}'
+```
+
+```python
+client.chat.completions.create(
+    model="qwen2.5-coder-14b-instruct",
+    messages=[{"role": "user", "content": "Kaç gün yıllık iznim var?"}],
+    extra_headers={"X-Llmgw-Knowledge": "politikalar"},
+)
+```
+
+What the gateway does with such a request:
+
+1. **It finds the collections.** It looks up the ones named, by name or ID,
+   among those the key may read. A collection it may not read is answered
+   404, the same as one that does not exist.
+2. **It embeds the question.** The last user message is embedded by the
+   collection's model, on the caller's own account: their limits, budget and
+   guardrails apply.
+3. **It searches.** The collections are searched by meaning and by words
+   (below).
+4. **It adds the passages.** The best passages are numbered and added to the
+   system message, with an instruction to answer from them, cite them as
+   [1], [2], and say so when they do not hold the answer. The system message
+   is created if the request has none. Passages that would not fit the
+   model's context are left out, the weakest first.
+5. **It judges and sends the request.** The request, passages included, then
+   goes through the guardrails and to the model as usual. A document
+   carrying instructions aimed at its reader is judged like anything else
+   the model reads.
+
+On the portal's chat page, **Documents** picks a collection the person may
+read in the chosen project, the default, or none. Under each answer, the
+sources it was given are listed by number.
+
+How it is shaped:
+
+| | |
+|---|---|
+| `X-Llmgw-Knowledge` | Collections, comma separated; `none` for no passages, whatever the default. |
+| `X-Llmgw-Knowledge-K` | How many passages, 1 to 20; 5 by default. |
+| `X-Llmgw-Project` | For a personal key: the project it acts in. |
+| `x-llmgw-sources` (answer) | The passages given, as `document#chunk`, in their numbered order; empty when nothing matched. |
+
+Behaviour to know about:
+
+- **No passages matched.** The model is told that nothing in the documents
+  answers the question, and asked to say so rather than answer from general
+  knowledge.
+- **Other APIs.** Requests through `/v1/responses` and `/v1/messages`
+  (Codex, Claude Code) work the same way, since they are answered as chat
+  completions.
+- **Separate prefix caches.** On vLLM replicas, a request given passages
+  carries a `cache_salt` derived from the collections they came from.
+  Requests that could be given the same passages still share cached blocks,
+  and no one else's do: not another organization's, nor another team's of
+  the same one. How fast an answer starts therefore says nothing about what
+  someone else asked.
+- **No answer cache.** Answers from knowledge bases are never served from
+  the answer cache, because two keys of one project can read different
+  collections.
+
+### How a passage is chosen
+
+Each passage scores the following, and the highest scores win:
+
+- its similarity in meaning to the question (cosine, 0 to 1), plus
+- up to 0.3 for the share of the question's words it contains.
+
+Words almost every passage has ("ne", "için", "the", "of") are not counted.
+The meaning does most of the work: "how much leave do fathers get" finds the
+paternity page, not the annual-leave page that shares more of its words.
+The word match helps with what meaning cannot carry, such as a form number,
+a product code or a name.
+
+Metrics: `llmgw_kb_retrievals_total{result}` (found, nothing, refused) and
+`llmgw_kb_retrieval_seconds`.
+
+## Training an adapter on a collection
+
+An adapter (LoRA) changes how a model *writes*: the organisation's words,
+format and tone. It does not reliably teach facts. On the PoC, a small
+model trained on nine policy documents answered 4 of 9 rephrased questions
+right and mixed facts up on the rest, while the same questions through the
+knowledge base got 9 of 9. Use both: the knowledge base for what answers
+say, an adapter for how they sound.
+
+```sh
+# 1. Questions and answers from the collection, written by a model of the
+#    cluster. Read the file through and correct it.
+llmgw ctl kb dataset Acme/policies --model qwen2.5-coder-14b-instruct --out policies.jsonl
+
+# 2. Train on a node. --gpu-memory is what the job needs of a card; it
+#    runs beside an engine when the engine leaves that much free.
+llmgw ctl train start policies-tone --model qwen2.5-0.5b-instruct \
+  --base-repo Qwen/Qwen2.5-0.5B-Instruct --node cuda01 --gpu-memory 2300 --data policies.jsonl
+llmgw ctl train show JOB --follow
+
+# 3. Make it the model's adapter, kept on the mirror.
+llmgw ctl train publish JOB --restart
+```
+
+The node trains with its installed vLLM's torch and a small overlay (peft
+and accelerate), as the engines' user. For a model llama.cpp serves, it also
+converts the adapter to GGUF with the installed llama.cpp's own code. What
+it makes is kept by the control plane (`llmgw ctl train download`).
+
+An adapter is private like its collection:
+
+- **It has an owner.** An adapter trained on a collection carries some of
+  what the collection says in its weights, so it belongs to a part of the
+  tree.
+  - By default the owner is the collection's owner.
+  - `--owner` names another, which must be able to read every collection
+    the pairs came from.
+  - Only callers in the owner's part of the tree see the adapter. To anyone
+    else it is a model that does not exist, absent from `/v1/models` too.
+- **It is public only by choice.** `--public` makes an adapter every
+  caller's. It is refused for pairs from a knowledge base, so it is only for
+  pairs written by hand.
+
+## How it is kept apart
+
+Passages live in PostgreSQL, partitioned by organization, with an index per
+collection. Every search and every write names the organization and the
+collections the caller may use. On top of that, row-level security on the
+table checks the same thing again, so a query that forgot its filter
+returns nothing rather than another tenant's passages.

docs/kong.md

@@ -0,0 +1,95 @@
+# llmgw and Kong
+
+For a site that already runs Kong. The two meet over plain HTTP: Kong in
+front of llmgw, as one more API it governs, or Kong behind llmgw, as an
+OpenAI-compatible provider. Nothing of either is built into the other.
+
+Tried with Kong Gateway 3.9 (`kong:3.9`, the last open-source release; 3.10
+and later need a Kong licence) in DB-less mode, in front of llmgw.
+
+## Kong in front of llmgw
+
+Two ways, both tried.
+
+**A plain route.** Kong forwards the request as it came. Tried with chat
+completions, streamed and not; llmgw's other APIs — Anthropic's
+`/v1/messages`, `/v1/responses`, embeddings, pictures — go the same way,
+since Kong does not read them. Kong adds its own authentication, rate limits
+and logging; llmgw still checks the key, the budget and the guardrails.
+
+```yaml
+_format_version: "3.0"
+services:
+- name: llmgw
+  url: https://llm.example.com          # llmgw's client port
+  routes:
+  - name: llmgw
+    paths: [/llmgw]                      # /llmgw/v1/chat/completions → /v1/chat/completions
+```
+
+**Kong's `ai-proxy` plugin**, for Kong's own token statistics on a chat
+route. llmgw is an OpenAI provider whose `upstream_url` is llmgw:
+
+```yaml
+services:
+- name: llmgw-chat
+  url: https://llm.example.com
+  routes:
+  - name: chat
+    paths: [/chat]
+  plugins:
+  - name: ai-proxy
+    config:
+      route_type: llm/v1/chat
+      logging: {log_statistics: true, log_payloads: false}
+      model:
+        provider: openai
+        name: qwen-coder                 # a model llmgw serves
+        options:
+          upstream_url: https://llm.example.com/v1/chat/completions
+```
+
+**Keys.** Without an `auth` block, `ai-proxy` passes the client's
+`Authorization` header on: each team keeps its own llmgw key, and llmgw's
+budgets, limits, guardrails and usage stay per team. With
+`auth: {header_name: Authorization, header_value: "Bearer sk-llmgw-…"}` Kong
+sends one key of its own instead, and llmgw sees every caller as that key —
+then budgets per team are Kong's to keep.
+
+**What Kong counts.** For a whole answer Kong reads llmgw's `usage` and
+records prompt and completion tokens as llmgw did. For a streamed answer
+Kong 3.9 records an estimate of the prompt tokens and no completion tokens,
+even with `stream_options.include_usage` set — the usage chunk reaches it
+and is not read. llmgw's own accounting counts both; use its usage export
+(`llmgw ctl usage export`) or `/admin/usage` for figures to bill by.
+
+**Timeouts.** A long answer from a model still loading outlasts Kong's
+60-second defaults: set the service's `read_timeout` to the time a model may
+take to start, as for nginx in [install.md](install.md).
+
+## Kong behind llmgw
+
+Not tried here. Kong's AI routes speak OpenAI's API, so llmgw reaches models Kong fronts as
+it reaches any provider: a model whose source is `external`.
+
+```yaml
+- name: kong-gpt
+  source: external
+  external:
+    url: https://kong.example.com/openai     # Kong's route, without /v1
+    model: gpt-4o-mini
+    api_key_file: /etc/llmgw/secrets/kong-consumer.key
+```
+
+The key is the one Kong's own authentication asks of a consumer. As a
+fallback (`fallbacks: [kong-gpt]`) it is used only when the cluster has no
+room.
+
+## Which to choose
+
+Kong in front when the site's API policy says every API goes through Kong:
+llmgw is then one more upstream, and its per-team accounting still holds
+when each team keeps its own key. Kong behind when the site already reaches
+outside providers through Kong and llmgw should too. llmgw does not need
+Kong for anything it does itself — keys, budgets, guardrails, routing to
+its own replicas.

docs/kubernetes.md

@@ -0,0 +1,228 @@
+# llmgw and Kubernetes
+
+The control plane runs in Kubernetes, from the Helm chart in
+`deploy/helm/llmgw`. The GPU nodes do not: they stay ordinary machines,
+joined with `llmgw node add` as on any other cluster. This page says why,
+and how the two meet.
+
+## What goes where
+
+| Part | Where | Why |
+|---|---|---|
+| Control plane: the API on 8080, the agents' port 7443, the scheduler | A StatefulSet, from the chart | A Go binary with a store and three ports: what Kubernetes runs well |
+| Store | A file on a PersistentVolumeClaim (SQLite), or your PostgreSQL | Either, as on a host |
+| GPU and CPU nodes | Outside, as hosts | See below |
+| Model mirror | Outside, on a machine with a large disk | Every node pulls tens of gigabytes from it over plain HTTP; a pod with a volume that size is a host in all but name |
+
+### Why the nodes stay outside
+
+The agent on a node is not a service that happens to use a GPU. It installs
+the engines on the machine — the llama.cpp build for its driver, vLLM in a
+Python environment — checks them against their publisher's checksums and
+runs them; it chooses which GPUs each replica gets, by index and by NVLink
+topology; it starts engines as processes that outlive its own restarts, so a
+node upgrades while it serves; it writes the machine's firewall; and it
+replaces its own binary when the cluster upgrades. All of that is root on
+the host, which is exactly what a container is built to prevent.
+
+Run as a DaemonSet it would need to be privileged, with the host's network,
+process namespace and filesystem, and the NVIDIA device plugin would have to
+be kept off its GPUs — or the two would hand the same card to two owners.
+What is left is the host agent with a container's indirection around it, and
+none of the scheduling, isolation or restart guarantees that make a pod
+worth having. So the chart does not ship one, and this is the
+recommendation:
+
+- **Keep GPU machines out of Kubernetes**, and add them with `node add`.
+- **If they are already Kubernetes workers**, dedicate them: taint them so
+  no other pod lands there, keep the NVIDIA device plugin off them (most
+  installs select nodes by label — leave the label off), and run the llmgw
+  agent on the host, where `node add` puts it. llmgw then owns the GPUs, and
+  Kubernetes schedules nothing that would want them.
+
+## The image
+
+The project publishes binaries, not an image. Build one from the repository
+and push it where the cluster pulls from — at an offline site, the internal
+registry:
+
+```
+docker build -f deploy/container/Dockerfile --build-arg VERSION=v0.11.1 \
+  -t registry.internal/llmgw:v0.11.1 .
+docker push registry.internal/llmgw:v0.11.1
+```
+
+It is the static binary on a distroless base: no shell, running as user
+65532, with a read-only root filesystem in the pod.
+
+## The agent port's certificate
+
+Agents and the control plane authenticate each other with certificates from
+llmgw's own authority, and the TLS ends in the pod — so the authority's key
+stays outside the cluster, on the machine you will add nodes from, and the
+pod is given only its own certificate.
+
+Decide first the address agents will dial: the `-agents` Service is a
+LoadBalancer, so give it a fixed `agentService.loadBalancerIP` or a DNS name
+that points at it. That address has to be in the certificate:
+
+```
+llmgw ctl cert init-ca --dir ./pki
+llmgw ctl cert issue-server llmgw-ctl --host 10.0.0.200 --host llmgw-agents.example.com \
+  --dir ./pki --out ./pki
+kubectl -n llmgw create secret generic llmgw-agent-tls \
+  --from-file=ca.pem=pki/ca.pem \
+  --from-file=server.pem=pki/server.pem \
+  --from-file=server-key.pem=pki/server-key.pem
+```
+
+Keep `pki/ca-key.pem` as you would on a host: whoever holds it can make any
+node's identity.
+
+## Installing
+
+```yaml
+# values.yaml
+image:
+  repository: registry.internal/llmgw
+  tag: v0.11.1
+agentTLS:
+  existingSecret: llmgw-agent-tls
+agentService:
+  loadBalancerIP: 10.0.0.200
+ingress:
+  enabled: true
+  className: nginx
+  hosts: [{host: llm.example.com, paths: [{path: /, pathType: Prefix}]}]
+  tls: [{secretName: llm-example-com, hosts: [llm.example.com]}]
+config:
+  mirror:
+    api: http://models.internal:8082
+  # The address the router reaches nodes' engines from is a Kubernetes
+  # node's, once the pod's traffic leaves the cluster: the nodes' firewalls
+  # must let it in.
+  firewall_networks: ["10.0.1.0/24"]
+```
+
+```
+helm install llmgw deploy/helm/llmgw -n llmgw -f values.yaml
+```
+
+`config` is `server.yaml`: any key of [reference.md](reference.md), laid
+under what the chart sets itself — the listeners, where the certificates,
+the admin token and the store are mounted. A changed `config` restarts the
+pod.
+
+**The store.** By default SQLite, on a 10 GiB claim. For PostgreSQL, put its
+address in a Secret and point the chart at it:
+
+```
+kubectl -n llmgw create secret generic llmgw-store \
+  --from-literal=dsn='postgres://llmgw:…@pg.internal:5432/llmgw?sslmode=verify-full'
+```
+
+```yaml
+store:
+  type: postgres
+  postgres:
+    existingSecret: llmgw-store
+```
+
+**One control plane.** The chart runs one replica. Two against PostgreSQL
+would elect a leader and keep a standby, but a standby serves nothing and is
+never ready, so a StatefulSet rollout would wait on it for ever. Kubernetes
+replaces the one pod within seconds when it goes, and agents reconnect on
+their own; the replicas on the nodes keep serving meanwhile.
+
+**Probes.** Alive is `/health`. Ready is `/leader`, which on PostgreSQL waits
+for the lease of the pod it replaced to run out — not `/ready`, which waits
+for a model replica, and would keep a cluster with no node yet from ever
+accepting one.
+
+**Monitoring.** The metrics port, 9091, serves metrics and nothing else;
+`serviceMonitor.enabled: true` makes a ServiceMonitor for the Prometheus
+Operator, and `deploy/monitoring` holds the rules and dashboards.
+
+## Using it
+
+The admin API listens on the pod's loopback, as on a host — it can dump keys
+from the heap when profiling is on. Reach it through the pod:
+
+```
+kubectl -n llmgw exec -it statefulset/llmgw -- llmgw users create you@example.com --password '…'
+kubectl -n llmgw exec -it statefulset/llmgw -- llmgw users role you@example.com admin
+kubectl -n llmgw exec -it statefulset/llmgw -- llmgw ctl status
+```
+
+or from your machine, through a port-forward:
+
+```
+kubectl -n llmgw port-forward statefulset/llmgw 9090:9090 &
+export LLMGW_ADMIN_TOKEN=$(kubectl -n llmgw get secret llmgw-admin -o jsonpath='{.data.admin-token}' | base64 -d)
+llmgw ctl status
+```
+
+The token is made by the chart and kept across upgrades
+(`adminToken.existingSecret` brings your own).
+
+## Adding nodes
+
+From the machine holding `pki/`, with the port-forward above running and
+`LLMGW_ADMIN_TOKEN` set:
+
+```
+sudo -E llmgw node add ubuntu@gpu01 \
+  --server https://10.0.0.200:7443 --pki ./pki --admin 127.0.0.1:9090
+```
+
+`--server` is the address in the certificate. The node is installed, checked
+and started over ssh exactly as on any cluster ([node-onboarding.md](node-onboarding.md)),
+and dials the control plane in the pod. Its firewall comes from
+`firewall_networks` in the server configuration `node add` reads (`--config`,
+`/etc/llmgw/server.yaml` by default): copy the chart's out of the cluster
+first, or give `--no-firewall` and keep the engines' ports open to the
+Kubernetes nodes by hand.
+
+```
+kubectl -n llmgw get configmap llmgw -o jsonpath='{.data.server\.yaml}' > server.yaml
+sudo -E llmgw node add ubuntu@gpu01 --config ./server.yaml --server https://10.0.0.200:7443 \
+  --pki ./pki --admin 127.0.0.1:9090
+```
+
+## Offline
+
+An offline site ([install.md](install.md), "Offline sites") works the same
+way with the control plane in a pod. Import the bundle on the mirror's
+machine with `llmgw bundle import`, record its engines' checksums in a
+file, and give that file to the chart as a ConfigMap:
+
+```
+llmgw bundle trust llmgw-bundle.tar --sha256 3f2a… --file ./offline.sha256
+kubectl -n llmgw create configmap llmgw-offline --from-file=offline.sha256
+```
+
+```yaml
+offlineChecksums:
+  configMap: llmgw-offline
+config:
+  offline:
+    mirror: http://models.internal:8081
+```
+
+A later bundle: `bundle trust` into the same file, and replace the ConfigMap
+(`kubectl create configmap … --dry-run=client -o yaml | kubectl apply -f -`).
+The control plane reads the file again when it changes; there is no restart.
+
+## What has and has not been tried
+
+The chart is checked with `helm lint` and `helm template` for SQLite,
+PostgreSQL, an Ingress, a ServiceMonitor and an offline cluster, and refuses
+what would not work — no image, no certificate, a PostgreSQL store without
+its address, more than one replica. The image has been run the way the
+chart runs it — read-only root, user 65532, the same files mounted at the
+same paths, SQLite on a volume — and answered `/health`, `/leader` and
+`/metrics`, with `llmgw ctl` and `llmgw users` working through `exec`.
+
+It has **not** been installed on a Kubernetes cluster, and no node has yet
+joined a control plane running in one. Until it has, a control plane on a
+host is the well-trodden path.

docs/large-models.md

@@ -0,0 +1,145 @@
+# Large models: several cards, several nodes
+
+A model too big for one card runs on several. llmgw chooses how from the
+model's own figures and the cluster as it is; this page is the rules it
+follows, the commands, and what to look at when a first one is brought up
+on new hardware.
+
+## How a model is split
+
+In order, the first that fits:
+
+1. **One card.** Nothing to split.
+2. **Several cards of one node, tensor parallel.** Every layer is cut
+   across the cards, so they talk for every token: they must be on one
+   NVLink domain. The agent reads `nvidia-smi topo -m` and gives a replica
+   the cards with the most NVLink between them
+   ([install.md](install.md#nvlink-if-your-gpus-have-it)).
+3. **Several nodes, pipeline parallel between them.** Each node holds a
+   run of layers on all its cards (tensor parallel inside it), and only a
+   layer's output crosses to the next node. The nodes must share one
+   InfiniBand or RoCE fabric: a replica never spans two, and never a node
+   with none. Any number of nodes, not only two or four.
+
+The plan takes the fewest cards, then the fewest nodes, then the better
+precision up to eight bits.
+
+**Tensor width and the KV heads.** The cards split the model's KV heads
+among them, or past their number each card holds a copy of one. So the
+width divides the KV heads or is a multiple of them: a model with 8 KV
+heads runs 2, 4, 8 or 16 wide, not 12. Qwen3-235B has 4 and runs on 8.
+
+**Mixture of experts.** A model of experts (Qwen3-235B-A22B, DeepSeek-V3,
+Llama 4, Mixtral) on more than one card is served with vLLM's
+`--enable-expert-parallel`: each card holds whole experts rather than a
+slice of every one, which is less traffic per token. It is read from
+`config.json` (`num_experts`, `n_routed_experts`, `num_local_experts`).
+
+**When it does not fit.** A smaller precision first: an FP8 or AWQ
+repository of the same model, or a GGUF quantisation on llama.cpp if one
+node's cards hold it. Then more nodes. `llmgw ctl model plan REPO
+--precision bf16,fp8` shows each precision's fit from the model's config.
+
+## What a way needs
+
+Each way the plan offers says what a replica needs of each card, part by
+part, and of all its cards together:
+
+```
+$ llmgw ctl model plan meta-llama/Llama-3.3-70B-Instruct --format safetensors --context 32768
+FILE      SIZE    BEST WAY        A CARD   OF     ALL CARDS  NOW
+original  131 GB  4 × h100-80g    37.4 GB  72 GB  150 GB     free
+
+Best: original on 4 × h100-80g: 37.4 GB a card (weights 32.9 + context 2.5 + engine 2.0) of 72 usable; 150 GB on 4 cards.
+The context costs 0.31 GB per 1000 tokens, the whole model (--context to plan another).
+```
+
+- **weights:** the files, divided over the cards.
+- **context:** the KV cache for the context planned, divided likewise.
+- **engine:** the engine's own: 2 GB and a fiftieth of the weights for vLLM.
+- **usable:** 90% of a card; the rest is the driver's and fragmentation's.
+
+The console's **Serve a model** shows the same for every way a file runs.
+A context longer than planned is checked against it before anything is
+fetched.
+
+## Serving one
+
+Without flags the plan's best way is taken:
+
+```
+llmgw ctl model serve Qwen/Qwen3-235B-A22B-Instruct-2507-FP8 --format safetensors --context-length 32768
+```
+
+Or a way given by hand, for instance two nodes of eight:
+
+```
+llmgw ctl model serve meta-llama/Llama-3.3-70B-Instruct --format safetensors \
+    --gpu-class h100-80g --gpus 8 --nodes 2 --env NCCL_DEBUG=INFO
+```
+
+`--gpus` is the cards on each node and `--nodes` the nodes. The pipeline
+is the nodes and the tensor width the cards of each.
+
+`--env KEY=VALUE` goes into the engine's environment on every node:
+`NCCL_DEBUG=INFO` while bringing a cluster up, `NCCL_IB_*` to steer it.
+Only the variables engines are tuned with are taken. llmgw already sets
+these:
+- `NCCL_IB_HCA` to the fabric's adapters;
+- `NCCL_IB_GID_INDEX` on RoCE;
+- `NCCL_SOCKET_IFNAME` to the management network;
+- for an NVLink domain spanning nodes, `NCCL_MNNVL_ENABLE`.
+
+The job's first step says what it needs of each card. The weights then
+come to the mirror once and from it to each node. The startup timeout (20
+minutes unless the profile's `startup_timeout` says otherwise) runs from
+when a node's download last moved. So a model of hundreds of gigabytes is
+not failed while it is still arriving, and one whose download stops is
+failed that long after.
+
+## Watching it come up
+
+| What | Where |
+|---|---|
+| The replica and its shards, one per node, each with its download | `llmgw ctl replicas` |
+| Why it is not placed | `llmgw ctl explain-placement MODEL` |
+| A node's engine output (NCCL's lines with `NCCL_DEBUG=INFO`) | `llmgw ctl logs NODE --source SHARD` |
+| The bandwidth between two nodes, rail by rail | `llmgw ctl fabric-test NODE NODE` |
+| Each node's GPUs, NVLink and adapters | `llmgw doctor` on the node; its page under /admin |
+| Every step of a start, across nodes | the `replica start` trace ([install.md](install.md)) |
+
+With `NCCL_DEBUG=INFO`, NCCL says which transport it took between nodes:
+`NET/IB` is the fabric. `NET/Socket` means it fell back to TCP, and the
+model will run, slowly.
+
+## Bringing it up on new hardware
+
+A first run on a fabric, in order. Each step is worth its output if
+something goes wrong.
+
+1. **The nodes.** Add each with its fabric:
+   `llmgw node add host --fabric ib-a:mlx5_0,mlx5_1`. Then
+   `llmgw ctl nodes` shows every node ready, on `ib-a`.
+2. **The fabric.** `llmgw ctl fabric-test node1 node2`: each rail at its
+   rated speed (a 400 Gb/s rail near 45 GB/s).
+3. **One node, several cards.** A dense 70B at bf16 on four or eight
+   cards of one node, by the plan:
+   `llmgw ctl model serve meta-llama/Llama-3.3-70B-Instruct --format safetensors`.
+   Ready, then a question answered.
+4. **Two nodes.** The same model forced over two:
+   `--gpu-class CLASS --gpus 8 --nodes 2 --env NCCL_DEBUG=INFO`, under
+   another `--name`. Ready, answering, and `NET/IB` in both shards' logs.
+5. **Experts.** A mixture-of-experts model on one node's eight cards,
+   for instance `Qwen/Qwen3-235B-A22B-Instruct-2507-FP8`: its profile
+   carries `--enable-expert-parallel` (`llmgw ctl models`, or its
+   definition from the admin API).
+6. **A node lost.** With the two-node replica serving, stop one node's
+   agent (`systemctl stop llmgw-agent`): the replica fails and is placed
+   again once the node is back or another has room. Nothing is left
+   holding cards.
+
+For each, worth keeping:
+- the time from serve to ready;
+- tokens a second from `llmgw ctl bench`;
+- the plan's per-card figure against what `nvidia-smi` shows once loaded;
+- anything it said that was wrong.

docs/onboarding.md

@@ -54,10 +54,20 @@ on the page that creates it and never again.
 
 ### Connecting an editor
 
-The account page's **Connect your editor** makes a key for Continue, Codex or
-Cline and shows what the tool needs with that key, this gateway's address and a
-model already in it:
+The account page's **Connect your editor** makes a key for VS Code, Continue,
+Codex or Cline and shows what the tool needs with that key, this gateway's
+address and a model already in it:
 
+- **VS Code** — llmgw's own extension, downloaded from the gateway at
+  `/setup/vscode/llmgw.vsix` with this gateway's address already in it. It
+  offers every chat model the key may use to VS Code itself: the chat's model
+  picker, agent mode, and any extension that asks VS Code for a language model
+  (Cline's "VS Code LM API" provider among them), with no setup of their own.
+  **llmgw: Sign In** in VS Code opens this page with VS Code chosen; the page's
+  **Open in VS Code** link hands the key back, and the extension keeps it in
+  VS Code's secret storage. A link the extension did not ask for is confirmed
+  first, with the gateway's address shown, since it decides where code is sent.
+  **llmgw: Enter API Key** takes a pasted one instead.
 - **Continue** — an assistant file of its own, `~/.continue/assistants/llmgw.yaml`,
   so their `config.yaml` is not touched.
 - **Codex** — a provider and a profile in `~/.codex/config.toml`, run with
@@ -65,6 +75,11 @@ model already in it:
   Responses API, which the gateway translates at `/v1/responses`.
 - **Cline** — four settings to paste into its own screen, since it keeps them
   in VS Code's secret storage where no file reaches.
+- **Claude Code** — not on the page yet; it speaks Anthropic's Messages API,
+  which the gateway translates at `/v1/messages`:
+  `ANTHROPIC_BASE_URL=https://<gateway> ANTHROPIC_AUTH_TOKEN=<key>
+  ANTHROPIC_MODEL=<model> ANTHROPIC_SMALL_FAST_MODEL=<model> claude`. It
+  needs a model that calls tools well.
 
 For Continue and Codex there is a one-line command,
 `curl -fsSL <gateway>/setup/<tool>?model=… | sh`. Its script is served without
@@ -191,7 +206,8 @@ project or person, the teams and projects with their limits and spend, and every
 member. Only what was spent in that organization's projects is on it; what its
 people do elsewhere is not. The page is read-only — a manager is not an
 administrator of the cluster, and limits and memberships stay with those who
-are.
+are. An administrator following `/org` lands on the same organization's panel
+on the people page instead, where all of that can be changed.
 
 `llmgw keys init` still works for provisioning scripts and is idempotent, but it
 will no longer move a team or project that already exists under another parent;
@@ -259,7 +275,7 @@ Allowlists compose by intersection: a key cannot add a model its team withheld.
 A model's canonical name and any of its aliases name the same thing, so either
 form works.
 
-Budgets are given in whole units, as the quotas page shows them, and what a unit
+Budgets are given in whole units, as the Limits tab shows them, and what a unit
 means is yours to decide. Self-hosted models have no per-token price, so it can
 be GPU-seconds, a notional rate, or one unit per thousand tokens everywhere —
 a price of 1 000 000 in `auth.pricing`, which is in micro-units — and a budget
@@ -303,6 +319,28 @@ shown as text. Other schemes are never linked — configuration is not always
 written by whoever runs the gateway, and a `javascript:` href on a page served to
 every visitor is a short path to a stored XSS.
 
+## The docs portal
+
+The gateway also serves its manual at `/docs`: these pages, rendered, with
+[clients.md](clients.md) — how to use the gateway from the official OpenAI
+and Anthropic SDKs — first on its index. The landing page and the account
+page link to it, so a user's questions about streaming, tools or the Anthropic
+SDK have an answer that is not you.
+
+It is public, like the landing page. The client guide is for the person who
+has no account yet, and the operator documents describe llmgw in general —
+no address, model, node or key of this installation — which is what the
+project's repository publishes anyway. A site that would rather not say even
+that turns sign-in on:
+
+```yaml
+landing:
+  docs_sign_in: true
+```
+
+A visitor is then sent to sign in first. On a gateway with API keys and no
+accounts, the portal asks for a key instead, like the API.
+
 ## What the user sees
 
 They open the link, press the button, and get the key once. The page shows them
@@ -324,8 +362,15 @@ llmgw keys list --store … --project default
 minute. It is the column that tells you whether a key is still in use, which is
 what makes rotation safe:
 
-**To rotate**, issue the new key, let both work while the user switches, watch
-`LAST USED` on the old one stop moving, then revoke it.
+**To rotate**, `llmgw keys rotate <key-id> --overlap 48h` issues a new key with
+the same project, owner and limits and lets the old one work for the overlap,
+then stop. Watch `LAST USED` on the old one stop moving before it runs out.
+
+**To cap how long keys live**, `llmgw keys ttl project:Acme/ml/train 720h` (or
+`team:`, `org:`; `off` removes it), and `auth.max_key_ttl` in server.yaml for
+every key. A key is made within the shortest limit that applies, and one asked
+for without an expiry gets that limit. `keys list --all` shows each key's kind
+— service (a project's), member, personal — and when it expires.
 
 ```
 llmgw keys revoke --store … key-mpmip77twpt7qaxc
@@ -344,16 +389,38 @@ is what someone gets from a borrowed laptop, and the password is what they do no
 have — and it signs every other browser out, which is the point if they are
 changing it because something went wrong.
 
-There is no self-service reset, because this gateway sends no email and a reset
-link with nowhere to send it is not a reset. When someone loses theirs:
+Someone who has forgotten theirs follows **Forgotten your password?** on the
+sign-in page. With mail set up in the cluster's settings, a link to set a new one
+is mailed to their address — the page says the same whether or not the address
+has an account, so nobody can find out who does from it:
+
+```
+llmgw ctl config set mail '{smtp: smtp.example.com:587, from: llmgw@example.com,
+  username: llmgw, password_file: /etc/llmgw/secrets/smtp, base_url: https://llm.example.com}'
+```
+
+`base_url` is where the link points, and it is never taken from the request:
+otherwise a stranger could ask for someone's link from a page of their own. A
+link works once, for an hour, and a newer one replaces it.
+
+Without mail, the page says to ask an operator, who makes the link and hands it
+over however suits:
+
+```
+llmgw users reset-link ayse@example.com --store …    # --base-url without mail.base_url
+```
+
+Or sets a temporary password to give them, and has them change it from their
+profile:
 
 ```
 llmgw users reset-password usr-k4mq… --password "a temporary passphrase" --store …
 ```
 
-Tell them out of band and have them change it from their profile. Their sessions
-are closed — if they lost the password, the reason might be that someone else has
-it. Their API keys keep working; those are separate credentials.
+Either way their sessions are closed — if they lost the password, the reason
+might be that someone else has it. Their API keys keep working; those are
+separate credentials. People who sign in through single sign-on have no password
+here, and get no link.
 
 ## Trying a model in the browser
 
@@ -409,10 +476,19 @@ page exists.
 opening onto its members and its keys. From there an admin approves people
 (into a project or on their own), adds them to and takes them out of
 organizations, teams and projects, suspends and removes them, revokes keys, and
-adds, renames, moves and removes organizations, teams and projects. `/admin/quotas`
-sets limits on the tree, per member of any part of it, and per person. A searchable list of every account is at the
-bottom. The page works as plain forms; with scripts on, a change updates it in
-place and the projects you had open stay open.
+adds, renames, moves and removes organizations, teams and projects. A
+searchable list of every account is at the bottom. Choosing any organization,
+team, project or person opens a panel beside the tree with its limits, its
+capacity quota and its use over the last week, and its limits can be changed
+there.
+
+The same page has two more tabs, each at the address it had as a page of its
+own: **Limits** (`/admin/quotas`) is every limit in the tree at once — per
+branch, per member of any part of it, and per person — with the capacity quotas;
+**Usage** (`/admin/usage`) is the cluster's use over time by organization, team,
+project or person, and the GPU time each owner held. The page works as plain
+forms; with scripts on, a change updates it in place and the projects you had
+open stay open.
 
 Three things are deliberately not there:
 
@@ -423,21 +499,26 @@ Three things are deliberately not there:
 | `llmgw keys create` | Issuing a credential on another person's behalf |
 
 Each of those turns a stolen admin cookie into more than it was, and each is
-rare enough that a shell is no hardship. Cordon, drain and everything else that
-touches the cluster are also CLI-only for the same reason: the dashboard shows
-the cluster, it does not steer it.
+rare enough that a shell is no hardship. Cordon and drain are CLI-only for the
+same reason; what the pages do change on the cluster — serving models through
+the mirror, a node's engines — needs the `operator` or `admin` staff role.
 
-Every administrative action is logged with who did it, including the ones that
-were refused.
+Every administrative change is recorded in the audit log — who, when, through
+what, the fields given with secrets taken out, and how it ended, refusals
+included: `llmgw ctl audit`, or **Audit** in the console.
 
 ## What this does not do
 
 - **No email.** No approval notice, no self-service password reset, no address
   verification. The loop is manual on purpose at this size; if it stops being
   the right size, that is the thing to automate.
-- **No SSO.** Accounts are local, with local passwords.
-- **No roles.** There is one flag, `is_admin`, and it grants looking at the
-  dashboard. Everything else an administrator does is the CLI, and having a
-  shell here is what makes someone one.
+- **Single sign-on is optional.** With `auth.oidc` people sign in through
+  your identity provider, and SCIM 2.0 (`auth.scim`) creates, updates and
+  suspends accounts from it; see [install.md](install.md#single-sign-on).
+  Without them accounts are local, with local passwords.
+- **Staff roles are coarse.** `viewer`, `operator`, `billing` and `admin`
+  (`llmgw users role`) decide what someone may see and do under /admin; an
+  organization's manager can view it but not change it. Every change is in
+  the audit log (`llmgw ctl audit`).
 - **Rate limits are per gateway instance.** With two instances each counts its own,
   so the effective limit doubles. v1 is single-instance by design.

docs/quick-install.md

@@ -8,10 +8,10 @@ explains every choice.
 
 | | |
 |---|---|
-| **One control plane machine** | Linux, x86-64 or ARM64. Debian 12, Ubuntu 22.04+ or RHEL 10. No GPU needed; 2 GB RAM, 20 GB disk. |
-| **GPU nodes** (optional to start) | The same Linux, with the NVIDIA driver installed. vLLM needs driver 580 or newer and a Turing GPU or newer (not V100). |
-| **root** | on the control plane, and `sudo` without a password on every node. |
-| **SSH** | from the control plane to each node, as a user with passwordless `sudo` there. |
+| **A control plane** | One machine, or three for high availability (the store replicated, either one able to take over). Linux, x86-64 or ARM64: Debian 12, Ubuntu 22.04+ or RHEL 10. No GPU needed; 2 GB RAM, 20 GB disk each — 12 GB RAM when it is also a node running the starter model and the two judges, which setup checks before it installs anything; four cores or more, or the judges on machines of their own, keep a judgment within its wait. |
+| **GPU nodes** (optional to start) | The same Linux, with the NVIDIA driver installed. vLLM needs driver 525 or newer and a Turing GPU or newer; a V100 gets an older vLLM. |
+| **root** | on the control plane. On the other two of a three-machine setup, `sudo` (its password is asked for if it needs one); on nodes, `sudo` without a password. |
+| **SSH** | from the control plane to the other machines. The setup screens take a key, the ssh agent or a password; `node add` uses ssh keys. A machine nothing may log into joins with a code instead (`llmgw join`). |
 | **Network** | nodes reach the control plane on 7443 and 8081; users reach it on 8080. The machines need internet access to download engines and models. |
 
 You do not install llama.cpp, vLLM, Python or CUDA. The nodes do that
@@ -35,26 +35,41 @@ install it.
 ## 2. Set up the control plane
 
 ```
-sudo llmgw server init
+sudo llmgw
 ```
 
-It asks for your email and a few choices, then sets up everything on this
-machine, in a few minutes. In a script, give them as flags instead:
-`sudo llmgw server init --admin you@example.com`.
+With nothing installed, `llmgw` opens the setup screens. They ask whether
+this is **one machine or three** (high availability), and for three, the
+other two: address, user, and an ssh key, the ssh agent or a password. They
+check every machine before installing anything — system, disk, clock, ports,
+internet, whether the machines reach one another — show the plan, and
+install:
 
-- the service, its certificates and its configuration;
-- your administrator account. **The password is printed once. Copy it now.**
+- the service, its certificates and its configuration, and a firewall for
+  its internal ports;
+- with three machines, the store replicated across them (PostgreSQL under
+  Patroni);
+- your administrator account. **The password is shown once. Copy it now.**
 - a model mirror, which downloads model files once for the whole cluster;
-- this machine as a first node, and a small model (Qwen2.5 0.5B) on it.
+- this machine as a first node, and a small model (Qwen2.5 0.5B) on it;
+- guardrails on every request, with a judge model (Qwen3Guard-Gen 0.6B, two
+  replicas) on CPUs — a request it cannot check is refused, not let through — and API keys that expire within 90 days. What is hardened, and how
+  to loosen it: [install.md](install.md#2-the-control-plane).
+
+Run again later, `sudo llmgw` is the console: the cluster's state and
+everything you can do to it ([console.md](console.md)). Every step below is
+also there, under **Do**.
+
+**In a script**, the same for one machine:
+
+```
+sudo llmgw server init --admin you@example.com
+```
 
 If nodes will reach this machine by a name or address it does not know itself
 (a DNS name, a NAT address), add `--host` for each:
-
-```
-sudo llmgw server init --admin you@example.com --host llm.example.com
-```
-
-It is safe to run again. It keeps what exists and finishes what is missing.
+`--host llm.example.com`. It is safe to run again: it keeps what exists and
+finishes what is missing.
 
 **The mirror on its own machine**, when it wants a larger disk than the
 control plane has: first on that machine, with llmgw installed as in step 1,
@@ -75,7 +90,7 @@ the account page.
 
 ## 3. Add the GPU nodes
 
-On the control plane:
+In the console, **Do → Add a node**. Or on the control plane:
 
 ```
 sudo llmgw node add ubuntu@10.0.0.21
@@ -131,7 +146,35 @@ agent is stopped.
 ## 4. Add a model
 
 Open `/admin/mirror` and choose **Explore models**. It lists what is popular on
-Hugging Face, showing only what your nodes can run.
+Hugging Face, showing only what your nodes can run: judged by the cluster as it
+is now — the largest card and its compute capability, the most memory on one
+node — so a model too big for them, in a form those cards lack (FP8 needs 8.9),
+or in neither GGUF nor safetensors is left out, and the page says how many.
+Without GPUs it lists GGUF only. Untick **only what these nodes can run** to
+see everything. On a model's page a file too big for the cluster is shown
+without a **Fetch** button, with what it would need.
+
+The **CPU tok/s** column is about how fast one reply would come on the CPU of
+the fastest node whose memory holds the model at Q4_K_M; a model's page gives
+it for each GGUF file by its own size. Every node's agent measures how fast its
+memory reads when it starts (it is in the agent's log as `memory_gbs`), and a
+token on a CPU reads every weight once: the estimate is that speed over the
+model's size — for a model of experts named like `30B-A3B`, its active part.
+On the test cluster it came within 15% of what llama.cpp measured. Several
+replies at once share the reads and each is slower.
+
+**GPU tok/s** is the same on the cards, for the layout this cluster would
+give the model — the fewest cards that hold it, of each class, the fastest of
+those; its tooltip says which ("2× h100-80g, NVLink, vLLM", "2 nodes × 1×
+a100-80g over ib0 (InfiniBand 200 Gb/s), vLLM"). A card's memory bandwidth is
+known from its model name (an H100 SXM and an H100 PCIe differ by half); a card
+not in the table gets no figure. Tensor parallel across a node's cards divides
+what each reads, and adds two all-reduces a layer, short over NVLink and
+longer over PCIe; llama.cpp across cards splits by layer, so the cards take
+turns and a reply is no faster than on one; a pipeline across nodes takes turns
+too, and adds a hop over the fabric for each node. One card's figures were
+measured on the test cluster's RTX 6000; tensor parallel and the fabric are
+from what NCCL is known to take, not measured here.
 
 1. Click a model to read its card.
 2. Pick one of its files, usually a `q4_k_m` for a first try, and click
@@ -197,6 +240,9 @@ through the proxy. There is an nginx configuration too:
 
 ## Next
 
-- [install.md](install.md): the same steps with every option explained.
+- [install.md](install.md): the same steps with every option explained, and
+  running the cluster after: monitoring, notifications, single sign-on,
+  backups, upgrades.
+- [console.md](console.md): everything the console does.
 - [fabrics.md](fabrics.md): InfiniBand and NVLink.
 - [onboarding.md](onboarding.md): accounts, projects, budgets and keys.

go.mod

@@ -1,41 +1,56 @@
 module gitea.mynodes.xyz/ilker/llmgw
 
-go 1.26.3
+go 1.26.6
 
 require (
 	connectrpc.com/connect v1.21.0
+	filippo.io/age v1.3.2
 	github.com/NVIDIA/go-nvml v0.13.4-0
 	github.com/cespare/xxhash/v2 v2.3.0
 	github.com/charmbracelet/bubbletea v1.3.10
 	github.com/charmbracelet/lipgloss v1.1.0
+	github.com/charmbracelet/x/ansi v0.11.6
+	github.com/coreos/go-oidc/v3 v3.21.0
+	github.com/go-jose/go-jose/v4 v4.1.4
+	github.com/go-ldap/ldap/v3 v3.4.15
+	github.com/go-zeromq/zmq4 v0.17.0
 	github.com/jackc/pgx/v5 v5.11.0
 	github.com/knadh/koanf/parsers/yaml v1.1.1
 	github.com/knadh/koanf/providers/env/v2 v2.0.1
 	github.com/knadh/koanf/providers/file v1.2.1
 	github.com/knadh/koanf/v2 v2.3.6
+	github.com/ledongthuc/pdf v0.0.0-20260907135840-6c8c28e0e8a0
 	github.com/mattn/go-isatty v0.0.24
 	github.com/prometheus/client_golang v1.24.1
 	github.com/prometheus/client_model v0.6.3
 	github.com/prometheus/common v0.71.0
 	github.com/spf13/cobra v1.10.2
+	github.com/vmihailenco/msgpack/v5 v5.4.1
 	github.com/yuin/goldmark v1.8.6
 	go.opentelemetry.io/otel v1.46.0
 	go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp v1.46.0
 	go.opentelemetry.io/otel/sdk v1.46.0
 	go.opentelemetry.io/otel/trace v1.46.0
+	go.yaml.in/yaml/v3 v3.0.5
 	golang.org/x/crypto v0.57.0
 	golang.org/x/net v0.59.0
+	golang.org/x/oauth2 v0.37.0
 	golang.org/x/sync v0.23.0
+	golang.org/x/sys v0.48.0
+	golang.org/x/term v0.46.0
+	golang.org/x/text v0.42.0
 	google.golang.org/protobuf v1.36.12
 	modernc.org/sqlite v1.59.0
 )
 
 require (
+	filippo.io/edwards25519 v1.2.0 // indirect
+	filippo.io/hpke v0.4.0 // indirect
+	github.com/Azure/go-ntlmssp v0.1.1 // indirect
 	github.com/aymanbagabas/go-osc52/v2 v2.0.1 // indirect
 	github.com/beorn7/perks v1.0.1 // indirect
 	github.com/cenkalti/backoff/v5 v5.0.3 // indirect
 	github.com/charmbracelet/colorprofile v0.4.1 // indirect
-	github.com/charmbracelet/x/ansi v0.11.6 // indirect
 	github.com/charmbracelet/x/cellbuf v0.0.15 // indirect
 	github.com/charmbracelet/x/term v0.2.2 // indirect
 	github.com/clipperhouse/displaywidth v0.9.0 // indirect
@@ -44,9 +59,11 @@ require (
 	github.com/dustin/go-humanize v1.0.1 // indirect
 	github.com/erikgeiser/coninput v0.0.0-20211004153227-1c3628e74d0f // indirect
 	github.com/fsnotify/fsnotify v1.9.0 // indirect
+	github.com/go-asn1-ber/asn1-ber v1.5.8 // indirect
 	github.com/go-logr/logr v1.4.4 // indirect
 	github.com/go-logr/stdr v1.2.2 // indirect
 	github.com/go-viper/mapstructure/v2 v2.5.0 // indirect
+	github.com/go-zeromq/goczmq/v4 v4.2.2 // indirect
 	github.com/google/uuid v1.6.0 // indirect
 	github.com/grpc-ecosystem/grpc-gateway/v2 v2.30.0 // indirect
 	github.com/inconshreveable/mousetrap v1.1.0 // indirect
@@ -54,6 +71,7 @@ require (
 	github.com/jackc/pgservicefile v0.0.0-20240606120523-5a60cdf6a761 // indirect
 	github.com/jackc/puddle/v2 v2.2.2 // indirect
 	github.com/knadh/koanf/maps v0.1.2 // indirect
+	github.com/kylelemons/godebug v1.1.0 // indirect
 	github.com/lucasb-eyer/go-colorful v1.3.0 // indirect
 	github.com/mattn/go-localereader v0.0.1 // indirect
 	github.com/mattn/go-runewidth v0.0.19 // indirect
@@ -68,14 +86,12 @@ require (
 	github.com/remyoudompheng/bigfft v0.0.0-20230129092748-24d4a6f8daec // indirect
 	github.com/rivo/uniseg v0.4.7 // indirect
 	github.com/spf13/pflag v1.0.9 // indirect
+	github.com/vmihailenco/tagparser/v2 v2.0.0 // indirect
 	github.com/xo/terminfo v0.0.0-20220910002029-abceb7e1c41e // indirect
 	go.opentelemetry.io/auto/sdk v1.2.1 // indirect
 	go.opentelemetry.io/otel/exporters/otlp/otlptrace v1.46.0 // indirect
 	go.opentelemetry.io/otel/metric v1.46.0 // indirect
 	go.opentelemetry.io/proto/otlp v1.11.0 // indirect
-	go.yaml.in/yaml/v3 v3.0.5 // indirect
-	golang.org/x/sys v0.48.0 // indirect
-	golang.org/x/text v0.42.0 // indirect
 	google.golang.org/genproto/googleapis/api v0.0.0-20260819154853-08b0e4226688 // indirect
 	google.golang.org/genproto/googleapis/rpc v0.0.0-20260819154853-08b0e4226688 // indirect
 	google.golang.org/grpc v1.83.1 // indirect

go.sum

@@ -1,7 +1,19 @@
+c2sp.org/CCTV/age v0.0.0-20260829155415-4448f2097b2d h1:Blprhc2SbChNZtWcU+BLTM4YdoqYAS9V7cJgOwJKyAs=
+c2sp.org/CCTV/age v0.0.0-20260829155415-4448f2097b2d/go.mod h1:SrHC2C7r5GkDk8R+NFVzYy/sdj0Ypg9htaPXQq5Cqeo=
 connectrpc.com/connect v1.21.0 h1:LhqSJt7jHf5NJBo9Jq/t/9FjcYAideif0mg+qe2jCUs=
 connectrpc.com/connect v1.21.0/go.mod h1:A2ygJrukXwWy32vkCAAHNVguZrqZ+jeZ9rGRnGR4dN4=
+filippo.io/age v1.3.2 h1:r6RSZLFSMm6rzKepZ7ZAYkKCu14f3/Me8c7uKYh7C8c=
+filippo.io/age v1.3.2/go.mod h1:TH/Yr2sSRhCKbaH4XPxpUV0Us8Gv6txYUpiZQWz8Evk=
+filippo.io/edwards25519 v1.2.0 h1:crnVqOiS4jqYleHd9vaKZ+HKtHfllngJIiOpNpoJsjo=
+filippo.io/edwards25519 v1.2.0/go.mod h1:xzAOLCNug/yB62zG1bQ8uziwrIqIuxhctzJT18Q77mc=
+filippo.io/hpke v0.4.0 h1:p575VVQ6ted4pL+it6M00V/f2qTZITO0zgmdKCkd5+A=
+filippo.io/hpke v0.4.0/go.mod h1:EmAN849/P3qdeK+PCMkDpDm83vRHM5cDipBJ8xbQLVY=
+github.com/Azure/go-ntlmssp v0.1.1 h1:l+FM/EEMb0U9QZE7mKNEDw5Mu3mFiaa2GKOoTSsNDPw=
+github.com/Azure/go-ntlmssp v0.1.1/go.mod h1:NYqdhxd/8aAct/s4qSYZEerdPuH1liG2/X9DiVTbhpk=
 github.com/NVIDIA/go-nvml v0.13.4-0 h1:o3jp9u2x1R9ShFE3v+Aesp55XOSIQFMJz/VGNUcJaNE=
 github.com/NVIDIA/go-nvml v0.13.4-0/go.mod h1:id63qwpoDWpFXwnwM6psDCSqW4BmNu6mWpr4YeQtPGo=
+github.com/alexbrainman/sspi v0.0.0-20250919150558-7d374ff0d59e h1:4dAU9FXIyQktpoUAgOJK3OTFc/xug0PCXYCqU0FgDKI=
+github.com/alexbrainman/sspi v0.0.0-20250919150558-7d374ff0d59e/go.mod h1:cEWa1LVoE5KvSD9ONXsZrj0z6KqySlCCNKHlLzbqAt4=
 github.com/aymanbagabas/go-osc52/v2 v2.0.1 h1:HwpRHbFMcZLEVr42D4p7XBqjyuxQH5SMiErDT4WkJ2k=
 github.com/aymanbagabas/go-osc52/v2 v2.0.1/go.mod h1:uYgXzlJ7ZpABp8OJ+exZzJJhRNQ2ASbcXHWsFqH8hp8=
 github.com/beorn7/perks v1.0.1 h1:VlbKKnNfV8bJzeqoa4cOKqO6bYr3WgKZxO8Z16+hsOM=
@@ -28,6 +40,8 @@ github.com/clipperhouse/stringish v0.1.1 h1:+NSqMOr3GR6k1FdRhhnXrLfztGzuG+VuFDfa
 github.com/clipperhouse/stringish v0.1.1/go.mod h1:v/WhFtE1q0ovMta2+m+UbpZ+2/HEXNWYXQgCt4hdOzA=
 github.com/clipperhouse/uax29/v2 v2.5.0 h1:x7T0T4eTHDONxFJsL94uKNKPHrclyFI0lm7+w94cO8U=
 github.com/clipperhouse/uax29/v2 v2.5.0/go.mod h1:Wn1g7MK6OoeDT0vL+Q0SQLDz/KpfsVRgg6W7ihQeh4g=
+github.com/coreos/go-oidc/v3 v3.21.0 h1:wZo4Q9Pum8dYEj0eMUPrqR+kvuGkeUplbLpNCkBqoWM=
+github.com/coreos/go-oidc/v3 v3.21.0/go.mod h1:DYCf24+ncYi+XkIH97GY1+dqoRlbaSI26KVTCI9SrY4=
 github.com/cpuguy83/go-md2man/v2 v2.0.6/go.mod h1:oOW0eioCTA6cOiMLiUPZOpcVxMig6NIQQ7OS05n1F4g=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/dustin/go-humanize v1.0.1 h1:GzkhY7T5VNhEkwH0PVJgjz+fX1rhBrR7pRT3mDkpeCY=
@@ -36,6 +50,12 @@ github.com/erikgeiser/coninput v0.0.0-20211004153227-1c3628e74d0f h1:Y/CXytFA4m6
 github.com/erikgeiser/coninput v0.0.0-20211004153227-1c3628e74d0f/go.mod h1:vw97MGsxSvLiUE2X8qFplwetxpGLQrlU1Q9AUEIzCaM=
 github.com/fsnotify/fsnotify v1.9.0 h1:2Ml+OJNzbYCTzsxtv8vKSFD9PbJjmhYF14k/jKC7S9k=
 github.com/fsnotify/fsnotify v1.9.0/go.mod h1:8jBTzvmWwFyi3Pb8djgCCO5IBqzKJ/Jwo8TRcHyHii0=
+github.com/go-asn1-ber/asn1-ber v1.5.8 h1:H9AZkK22UOmfX8J84ubyaZxKJZ3FMHVwn8swoMML7iQ=
+github.com/go-asn1-ber/asn1-ber v1.5.8/go.mod h1:hEBeB/ic+5LoWskz+yKT7vGhhPYkProFKoKdwZRWMe0=
+github.com/go-jose/go-jose/v4 v4.1.4 h1:moDMcTHmvE6Groj34emNPLs/qtYXRVcd6S7NHbHz3kA=
+github.com/go-jose/go-jose/v4 v4.1.4/go.mod h1:x4oUasVrzR7071A4TnHLGSPpNOm2a21K9Kf04k1rs08=
+github.com/go-ldap/ldap/v3 v3.4.15 h1:eRB4f4Ecn1POL1mO86+uUDlecmyWsdiJwh60bAUS4UY=
+github.com/go-ldap/ldap/v3 v3.4.15/go.mod h1:jeD0c98EdZQCKKKKe4kTWs5aCf6y+j8KuYsYLznZSQk=
 github.com/go-logr/logr v1.2.2/go.mod h1:jdQByPbusPIv2/zmleS9BjJVeZ6kBagPoEUsqbVz/1A=
 github.com/go-logr/logr v1.4.4 h1:tG4xh9yMsRCAiodLVTxyrkzSZ9+o0L1Kg/+cPVcbP/8=
 github.com/go-logr/logr v1.4.4/go.mod h1:9T104GzyrTigFIr8wt5mBrctHMim0Nb2HLGrmQ40KvY=
@@ -43,6 +63,10 @@ github.com/go-logr/stdr v1.2.2 h1:hSWxHoqTgW2S2qGc0LTAI563KZ5YKYRhT3MFKZMbjag=
 github.com/go-logr/stdr v1.2.2/go.mod h1:mMo/vtBO5dYbehREoey6XUKy/eSumjCCveDpRre4VKE=
 github.com/go-viper/mapstructure/v2 v2.5.0 h1:vM5IJoUAy3d7zRSVtIwQgBj7BiWtMPfmPEgAXnvj1Ro=
 github.com/go-viper/mapstructure/v2 v2.5.0/go.mod h1:oJDH3BJKyqBA2TXFhDsKDGDTlndYOZ6rGS0BRZIxGhM=
+github.com/go-zeromq/goczmq/v4 v4.2.2 h1:HAJN+i+3NW55ijMJJhk7oWxHKXgAuSBkoFfvr8bYj4U=
+github.com/go-zeromq/goczmq/v4 v4.2.2/go.mod h1:Sm/lxrfxP/Oxqs0tnHD6WAhwkWrx+S+1MRrKzcxoaYE=
+github.com/go-zeromq/zmq4 v0.17.0 h1:r12/XdqPeRbuaF4C3QZJeWCt7a5vpJbslDH1rTXF+Kc=
+github.com/go-zeromq/zmq4 v0.17.0/go.mod h1:EQxjJD92qKnrsVMzAnx62giD6uJIPi1dMGZ781iCDtY=
 github.com/golang/protobuf v1.5.4 h1:i7eJL8qZTpSEXOPTxNKhASYpMn+8e5Q6AdndVa1dWek=
 github.com/golang/protobuf v1.5.4/go.mod h1:lnTiLA8Wa4RWRcIUkrtSVa5nRhsEGBg48fD6rSs7xps=
 github.com/google/go-cmp v0.7.0 h1:wk8382ETsv4JYUZwIsn6YpYiWiBsYLSJiTsyBybVuN8=
@@ -53,6 +77,8 @@ github.com/google/uuid v1.6.0 h1:NIvaJDMOsjHA8n1jAhLSgzrAzy1Hgr+hNrb57e+94F0=
 github.com/google/uuid v1.6.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
 github.com/grpc-ecosystem/grpc-gateway/v2 v2.30.0 h1:/Tnpcb2E0Pz/tN9s3bfEY2Q8ePCEX9iuS+cneUwncnw=
 github.com/grpc-ecosystem/grpc-gateway/v2 v2.30.0/go.mod h1:zOBXOsUaBSjKgmH4OGzV1esUpR3oUSCPYVd2cUBjKYY=
+github.com/hashicorp/go-uuid v1.0.3 h1:2gKiV6YVmrJ1i2CKKa9obLvRieoRGviZFL26PcT/Co8=
+github.com/hashicorp/go-uuid v1.0.3/go.mod h1:6SBZvOh/SIDV7/2o3Jml5SYk/TvGqwFJ/bN7x4byOro=
 github.com/hashicorp/golang-lru/v2 v2.0.7 h1:a+bsQ5rvGLjzHuww6tVxozPZFVghXaHOwFs4luLUK2k=
 github.com/hashicorp/golang-lru/v2 v2.0.7/go.mod h1:QeFd9opnmA6QUJc5vARoKUSoFhyfM2/ZepoAG6RGpeM=
 github.com/inconshreveable/mousetrap v1.1.0 h1:wN+x4NVGpMsO7ErUn/mUI3vEoE6Jt13X2s0bqwp9tc8=
@@ -65,6 +91,18 @@ github.com/jackc/pgx/v5 v5.11.0 h1:IzBBtyK9AHqf98cctWFifYSci2hgQR/cd56wB4p+ogg=
 github.com/jackc/pgx/v5 v5.11.0/go.mod h1:mal1tBGAFfLHvZzaYh77YS/eC6IX9OWbRV1QIIM0Jn4=
 github.com/jackc/puddle/v2 v2.2.2 h1:PR8nw+E/1w0GLuRFSmiioY6UooMp6KJv0/61nB7icHo=
 github.com/jackc/puddle/v2 v2.2.2/go.mod h1:vriiEXHvEE654aYKXXjOvZM39qJ0q+azkZFrfEOc3H4=
+github.com/jcmturner/aescts/v2 v2.0.0 h1:9YKLH6ey7H4eDBXW8khjYslgyqG2xZikXP0EQFKrle8=
+github.com/jcmturner/aescts/v2 v2.0.0/go.mod h1:AiaICIRyfYg35RUkr8yESTqvSy7csK90qZ5xfvvsoNs=
+github.com/jcmturner/dnsutils/v2 v2.0.0 h1:lltnkeZGL0wILNvrNiVCR6Ro5PGU/SeBvVO/8c/iPbo=
+github.com/jcmturner/dnsutils/v2 v2.0.0/go.mod h1:b0TnjGOvI/n42bZa+hmXL+kFJZsFT7G4t3HTlQ184QM=
+github.com/jcmturner/gofork v1.7.6 h1:QH0l3hzAU1tfT3rZCnW5zXl+orbkNMMRGJfdJjHVETg=
+github.com/jcmturner/gofork v1.7.6/go.mod h1:1622LH6i/EZqLloHfE7IeZ0uEJwMSUyQ/nDd82IeqRo=
+github.com/jcmturner/goidentity/v6 v6.0.1 h1:VKnZd2oEIMorCTsFBnJWbExfNN7yZr3EhJAxwOkZg6o=
+github.com/jcmturner/goidentity/v6 v6.0.1/go.mod h1:X1YW3bgtvwAXju7V3LCIMpY0Gbxyjn/mY9zx4tFonSg=
+github.com/jcmturner/gokrb5/v8 v8.4.4 h1:x1Sv4HaTpepFkXbt2IkL29DXRf8sOfZXo8eRKh687T8=
+github.com/jcmturner/gokrb5/v8 v8.4.4/go.mod h1:1btQEpgT6k+unzCwX1KdWMEwPPkkgBtP+F6aCACiMrs=
+github.com/jcmturner/rpc/v2 v2.0.3 h1:7FXXj8Ti1IaVFpSAziCZWNzbNuZmnvw/i6CqLNdWfZY=
+github.com/jcmturner/rpc/v2 v2.0.3/go.mod h1:VUJYCIDm3PVOEHw8sgt091/20OJjskO/YJki3ELg/Hc=
 github.com/klauspost/compress v1.19.1 h1:VsB4HPswih7mmZ8WleSFQ75c/Ui1M4trX5oAsJnhSlk=
 github.com/klauspost/compress v1.19.1/go.mod h1:cwPg85FWrGar70rWktvGQj8/hthj3wpl0PGDogxkrSQ=
 github.com/knadh/koanf/maps v0.1.2 h1:RBfmAW5CnZT+PJ1CVc1QSJKf4Xu9kxfQgYVQSu8hpbo=
@@ -79,6 +117,8 @@ github.com/knadh/koanf/v2 v2.3.6 h1:JoQPSJmvS4aP0xNc8xMDr5tcrkSEInL23/Il7pITAKo=
 github.com/knadh/koanf/v2 v2.3.6/go.mod h1:gRb40VRAbd4iJMYYD5IxZ6hfuopFcXBpc9bbQpZwo28=
 github.com/kylelemons/godebug v1.1.0 h1:RPNrshWIDI6G2gRW9EHilWtl7Z6Sb1BR0xunSBf0SNc=
 github.com/kylelemons/godebug v1.1.0/go.mod h1:9/0rRGxNHcop5bhtWyNeEfOS8JIWk580+fNqagV/RAw=
+github.com/ledongthuc/pdf v0.0.0-20260907135840-6c8c28e0e8a0 h1:7Q+xNAZFmnfYOMweHN3c/PDFUKKfY1pVJ26K++QvVfU=
+github.com/ledongthuc/pdf v0.0.0-20260907135840-6c8c28e0e8a0/go.mod h1:1fEHWurg7pvf5SG6XNE5Q8UZmOwex51Mkx3SLhrW5B4=
 github.com/lucasb-eyer/go-colorful v1.3.0 h1:2/yBRLdWBZKrf7gB40FoiKfAWYQ0lqNcbuQwVHXptag=
 github.com/lucasb-eyer/go-colorful v1.3.0/go.mod h1:R4dSotOR9KMtayYi1e77YzuveK+i7ruzyGqttikkLy0=
 github.com/mattn/go-isatty v0.0.24 h1:tGZZoVgT/KiqK1c8ocVLeDS8BSWMRd47J3Lbz7vsReI=
@@ -124,6 +164,10 @@ github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UV
 github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
 github.com/stretchr/testify v1.12.1 h1:EuwCh5fleGS7H32xRwO3wRGT7DxrDhLAT6FF8MpWDWE=
 github.com/stretchr/testify v1.12.1/go.mod h1:MDEgiDPPsNp5cuIrHPPCyornHKgEVbtFUmoNlxoYthg=
+github.com/vmihailenco/msgpack/v5 v5.4.1 h1:cQriyiUvjTwOHg8QZaPihLWeRAAVoCpE00IUPn0Bjt8=
+github.com/vmihailenco/msgpack/v5 v5.4.1/go.mod h1:GaZTsDaehaPpQVyxrf5mtQlH+pc21PIudVV/E3rRQok=
+github.com/vmihailenco/tagparser/v2 v2.0.0 h1:y09buUbR+b5aycVFQs/g70pqKVZNBmxwAhO7/IwNM9g=
+github.com/vmihailenco/tagparser/v2 v2.0.0/go.mod h1:Wri+At7QHww0WTrCBeu4J6bNtoV6mEfg5OIWRZA9qds=
 github.com/xo/terminfo v0.0.0-20220910002029-abceb7e1c41e h1:JVG44RsyaB9T2KIHavMF/ppJZNG9ZpyihvCd0w101no=
 github.com/xo/terminfo v0.0.0-20220910002029-abceb7e1c41e/go.mod h1:RbqR21r5mrJuqunuUZ/Dhy/avygyECGrLceyNeo4LiM=
 github.com/yuin/goldmark v1.8.6 h1:d0VcaP1sx9GkFVkoW+KtggpGi2KZ965i14b0+bDQST4=
@@ -161,11 +205,15 @@ golang.org/x/mod v0.41.0 h1:qJmnOUb4YB+FsEuM3HcWucdZASCPGhsX6uljO6pog0c=
 golang.org/x/mod v0.41.0/go.mod h1:Ek9pY8RKWXwsWvd3rQiHYtMqkjSUV+s1Rj7j4H5Ur6o=
 golang.org/x/net v0.59.0 h1:5zfYln+w5XCxwrnMMJPufRgNoXEaGxl0wo5GqPXyues=
 golang.org/x/net v0.59.0/go.mod h1:2DA/G1UfVbCpQPeWTmMPGY7Cs2PkBkwu743bVX5PIVg=
+golang.org/x/oauth2 v0.37.0 h1:JUlcxA8oAtauLfiH8FX2/FkAWHAdi0QtGCGc+hofE98=
+golang.org/x/oauth2 v0.37.0/go.mod h1:IxwZNxUULJmpBFf9K/9NTMSIfZZuvuTy1gGxhigP/58=
 golang.org/x/sync v0.23.0 h1:KameEIfc1IkluZyXWLn39Wd4tURc6GbCiISGiZm2bQk=
 golang.org/x/sync v0.23.0/go.mod h1:sUUOizhqBxiL6pEWpqNLUiaJn1ShEbZ6BBqskPbjZm0=
 golang.org/x/sys v0.0.0-20210809222454-d867a43fc93e/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.48.0 h1:bbX/i/6MgT9BVLM9RT1thmxL04yeTAhbEz4SyadbXoo=
 golang.org/x/sys v0.48.0/go.mod h1:hNLxWAXmnKAxqDtdwIYC4bM9oQPEecfsnNMuSxOs3og=
+golang.org/x/term v0.46.0 h1:3+OXuTbaKDgwk8jTi3aSLHRlmWqHEUDUtxnbFigO4YE=
+golang.org/x/term v0.46.0/go.mod h1:+K02xbkittuwc0Am4abfA3Fc+XRGXkvBXNO88NCXPoc=
 golang.org/x/text v0.42.0 h1:JbOZXgfeCPU9gacVtYliJqOhD+zhrEqK4LfdpmlUZqI=
 golang.org/x/text v0.42.0/go.mod h1:ojzP1Z+2QtioaF8DTtO8K5q7JWVVYwZKenzujK0Zd0E=
 golang.org/x/tools v0.49.0 h1:3NI7VXzL9+1WZD52Dx2ttoPwD5DWrFGpl9mFZDlmisI=

internal/account/account_test.go

@@ -398,3 +398,90 @@ func TestGuessingTheCurrentPasswordIsBounded(t *testing.T) {
 		t.Errorf("guessing was unbounded: %v", err)
 	}
 }
+
+func TestSomebodyGuessingElsewhereCannotLockTheOwnerOut(t *testing.T) {
+	svc, st := newStoreAndUser(t)
+	ctx := context.Background()
+	must(t, st.ApproveUser(ctx, "usr-1", "proj", "ilker", time.Now()))
+	cfg := DefaultConfig()
+	cfg.MaxAttempts = 3
+	svc = New(st, cfg, slog.New(slog.DiscardHandler))
+
+	attacker, owner := WithClient(ctx, "203.0.113.9"), WithClient(ctx, "198.51.100.7")
+	for range 5 {
+		_, _, _ = svc.SignIn(attacker, "ayse@example.com", "nope")
+	}
+	if _, _, err := svc.SignIn(attacker, "ayse@example.com", "nope"); !errors.Is(err, ErrTooManyTries) {
+		t.Errorf("the guessing client was not held back: %v", err)
+	}
+	if _, _, err := svc.SignIn(owner, "ayse@example.com", goodPassword); err != nil {
+		t.Errorf("the owner, elsewhere, was locked out: %v", err)
+	}
+	// Spread over many clients, guessing is still bounded per address.
+	held := false
+	for i := range 40 {
+		c := WithClient(ctx, "192.0.2."+strings.Repeat("1", 1+i%3)+string(rune('0'+i%10)))
+		if _, _, err := svc.SignIn(c, "ayse@example.com", "nope"); errors.Is(err, ErrTooManyTries) {
+			held = true
+		}
+	}
+	if !held {
+		t.Error("guesses from many clients were not bounded")
+	}
+}
+
+func TestAHashThatCannotGetATurnSaysTheServerIsBusy(t *testing.T) {
+	was := argonWait
+	argonWait = 10 * time.Millisecond
+	t.Cleanup(func() { argonWait = was })
+	// Every turn taken.
+	n := cap(argonSlots)
+	for range n {
+		argonSlots <- struct{}{}
+	}
+	t.Cleanup(func() {
+		for range n {
+			<-argonSlots
+		}
+	})
+	if _, err := HashPassword(goodPassword); !errors.Is(err, ErrBusy) {
+		t.Errorf("a hash with no turn: %v", err)
+	}
+}
+
+func TestAForgottenPasswordIsResetOnceThroughALink(t *testing.T) {
+	svc, st := newService(t)
+	ctx := context.Background()
+	must(t, svc.SignUp(ctx, "ayse@example.com", "A", goodPassword))
+	u, _ := st.UserByEmail(ctx, "ayse@example.com")
+
+	// Waiting for approval: no link, said the same as for nobody.
+	if _, _, err := svc.RequestReset(ctx, st, "ayse@example.com"); !errors.Is(err, ErrNoReset) {
+		t.Fatalf("a pending account got a link: %v", err)
+	}
+	if _, _, err := svc.RequestReset(ctx, st, "nobody@example.com"); !errors.Is(err, ErrNoReset) {
+		t.Fatalf("an unknown address: %v", err)
+	}
+	must(t, st.ApproveUser(ctx, u.ID, "proj", "ilker", time.Now()))
+	session, _, err := svc.SignIn(ctx, "ayse@example.com", goodPassword)
+	must(t, err)
+
+	token, got, err := svc.RequestReset(ctx, st, "AYSE@example.com")
+	if err != nil || token == "" || got.ID != u.ID {
+		t.Fatalf("an active account: %q %+v %v", token, got, err)
+	}
+	if err := svc.ResetPassword(ctx, st, st, token, "short"); !errors.Is(err, ErrWeakPassword) {
+		t.Fatalf("a weak password: %v", err)
+	}
+	next := goodPassword + "-new"
+	must(t, svc.ResetPassword(ctx, st, st, token, next))
+	if _, _, err := svc.Resolve(ctx, session); err == nil {
+		t.Error("a session from before the reset still works")
+	}
+	if _, _, err := svc.SignIn(ctx, "ayse@example.com", next); err != nil {
+		t.Errorf("the new password does not sign in: %v", err)
+	}
+	if err := svc.ResetPassword(ctx, st, st, token, next+"2"); !errors.Is(err, ErrNoReset) {
+		t.Errorf("a link used twice: %v", err)
+	}
+}

internal/account/directory_test.go

@@ -0,0 +1,63 @@
+package account
+
+import (
+	"context"
+	"errors"
+	"testing"
+	"time"
+
+	"gitea.mynodes.xyz/ilker/llmgw/internal/store"
+)
+
+type fakeDirectory struct {
+	asked []string
+	u     store.User
+	err   error
+}
+
+func (f *fakeDirectory) SignIn(_ context.Context, login, _ string) (store.User, error) {
+	f.asked = append(f.asked, login)
+	return f.u, f.err
+}
+
+// With a directory, a name the store has no password for is the
+// directory's to check; an account with a password here — the
+// administrator init made — is still checked here, so a directory that is
+// down locks nobody out.
+func TestPasswordsKeptElsewhereAreTheDirectorysToCheck(t *testing.T) {
+	svc, st := newService(t)
+	ctx := t.Context()
+	hash, _ := HashPassword("local-secret")
+	admin := store.User{ID: "usr-admin", Email: "admin@example.com", Name: "a", PasswordHash: hash,
+		State: store.UserActive, CreatedAt: time.Now()}
+	ada := store.User{ID: "usr-ada", Email: "ada@corp.example", Name: "Ada", PasswordHash: "!ldap",
+		State: store.UserActive, CreatedAt: time.Now()}
+	for _, u := range []store.User{admin, ada} {
+		if err := st.CreateUser(ctx, u); err != nil {
+			t.Fatal(err)
+		}
+	}
+	dir := &fakeDirectory{u: ada}
+	svc.SetDirectory(dir)
+
+	if _, _, err := svc.SignIn(ctx, "admin@example.com", "local-secret"); err != nil || len(dir.asked) != 0 {
+		t.Fatalf("the local administrator: %v, directory asked %v", err, dir.asked)
+	}
+	// A name, not an address, and an account kept by the directory.
+	for _, login := range []string{`CORP\ada`, "ada@corp.example"} {
+		if tok, _, err := svc.SignIn(ctx, login, "ad-secret"); err != nil || tok == "" {
+			t.Errorf("%s: %v", login, err)
+		}
+	}
+	if len(dir.asked) != 2 || dir.asked[0] != `CORP\ada` {
+		t.Errorf("the directory was asked %v", dir.asked)
+	}
+	dir.err = ErrBadCredentials
+	if _, _, err := svc.SignIn(ctx, "ada", "wrong"); !errors.Is(err, ErrBadCredentials) {
+		t.Errorf("a password the directory refused: %v", err)
+	}
+	// A reset link would give a directory's account a password here.
+	if _, _, err := svc.RequestReset(ctx, st, "ada@corp.example"); !errors.Is(err, ErrNoReset) {
+		t.Errorf("a directory's account was sent a reset link: %v", err)
+	}
+}

internal/account/password.go

@@ -17,6 +17,7 @@ import (
 	"fmt"
 	"runtime"
 	"strings"
+	"time"
 
 	"golang.org/x/crypto/argon2"
 )
@@ -57,7 +58,10 @@ func HashPassword(password string) (string, error) {
 	if _, err := rand.Read(salt); err != nil {
 		return "", err
 	}
-	sum := idKey([]byte(password), salt, argonTime, argonMemory, argonThreads, argonKeyLen)
+	sum, err := idKey([]byte(password), salt, argonTime, argonMemory, argonThreads, argonKeyLen)
+	if err != nil {
+		return "", err
+	}
 
 	b64 := base64.RawStdEncoding.EncodeToString
 	return fmt.Sprintf("$argon2id$v=%d$m=%d,t=%d,p=%d$%s$%s",
@@ -94,7 +98,10 @@ func VerifyPassword(password, encoded string) (bool, error) {
 		return false, ErrBadHash
 	}
 
-	got := idKey([]byte(password), salt, time, memory, threads, uint32(len(want)))
+	got, err := idKey([]byte(password), salt, time, memory, threads, uint32(len(want)))
+	if err != nil {
+		return false, err
+	}
 	return subtle.ConstantTimeCompare(got, want) == 1, nil
 }
 
@@ -119,8 +126,19 @@ func init() {
 // Beyond the bound, attempts wait their turn instead.
 var argonSlots = make(chan struct{}, max(2, runtime.NumCPU()/2))
 
-func idKey(password, salt []byte, time, memory uint32, threads uint8, keyLen uint32) []byte {
-	argonSlots <- struct{}{}
+// ErrBusy is a hash that waited its turn too long: the server is answering
+// more sign-ins than it can hash, and says so rather than hold the request.
+var ErrBusy = errors.New("too many sign-ins at once; try again in a moment")
+
+// argonWait bounds the wait for a turn; a variable so a test can shorten it.
+var argonWait = 10 * time.Second
+
+func idKey(password, salt []byte, t, memory uint32, threads uint8, keyLen uint32) ([]byte, error) {
+	select {
+	case argonSlots <- struct{}{}:
+	case <-time.After(argonWait):
+		return nil, ErrBusy
+	}
 	defer func() { <-argonSlots }()
-	return argon2.IDKey(password, salt, time, memory, threads, keyLen)
+	return argon2.IDKey(password, salt, t, memory, threads, keyLen), nil
 }

internal/account/service.go

@@ -80,8 +80,26 @@ type Service struct {
 
 	mu       sync.Mutex
 	attempts map[string]*attemptWindow
+
+	// dir checks the passwords of accounts this store keeps none for.
+	dir Directory
 }
 
+// Directory checks a password against an outside directory — Active
+// Directory over LDAP — and answers the account to sign in: made or kept in
+// step with the directory. Its errors are this package's ErrBadCredentials
+// and ErrSuspended for the person's own, and anything else for the
+// directory's.
+type Directory interface {
+	SignIn(ctx context.Context, login, password string) (store.User, error)
+}
+
+// SetDirectory has passwords for accounts with none here, and names that are
+// not addresses, checked by the directory. An account with a password here
+// — the administrator init made — is still checked here, so a directory that
+// is down locks nobody out.
+func (s *Service) SetDirectory(d Directory) { s.dir = d }
+
 type attemptWindow struct {
 	count int
 	since time.Time
@@ -137,12 +155,30 @@ func (s *Service) SignUp(ctx context.Context, email, name, password string) erro
 // SignIn checks a password and opens a session, returning the session token and
 // the CSRF token that must accompany the forms in it.
 func (s *Service) SignIn(ctx context.Context, email, password string) (token, csrf string, err error) {
+	login := strings.TrimSpace(email)
 	email = store.NormalizeEmail(email)
-	if !s.allowAttempt(email) {
+	// Counted per address and the client trying it, so somebody guessing
+	// from elsewhere cannot lock the owner out of their own account; and per
+	// address alone, more loosely, so guesses spread over many clients are
+	// still bounded.
+	byClient := email
+	if c := clientFrom(ctx); c != "" {
+		byClient = email + "|" + c
+	}
+	if !s.allowAttempt(byClient, s.cfg.MaxAttempts) || !s.allowAttempt("all|"+email, 10*s.cfg.MaxAttempts) {
 		return "", "", ErrTooManyTries
 	}
 
 	u, err := s.store.UserByEmail(ctx, email)
+	// No password kept here — the directory's, or nobody's — and a
+	// directory to ask: it decides.
+	if s.dir != nil && (errors.Is(err, store.ErrNotFound) || (err == nil && strings.HasPrefix(u.PasswordHash, "!"))) {
+		if u, err = s.dir.SignIn(ctx, login, password); err != nil {
+			return "", "", err
+		}
+		s.clearAttempts(byClient)
+		return s.open(ctx, u)
+	}
 	if errors.Is(err, store.ErrNotFound) {
 		// Verify anyway, against a hash that cannot match. Returning early here
 		// would let a stopwatch enumerate every account on the system.
@@ -154,11 +190,15 @@ func (s *Service) SignIn(ctx context.Context, email, password string) (token, cs
 	}
 
 	ok, err := VerifyPassword(password, u.PasswordHash)
+	if errors.Is(err, ErrBusy) {
+		// Not an answer about the password: said as what it is.
+		return "", "", err
+	}
 	if err != nil || !ok {
 		return "", "", ErrBadCredentials
 	}
 	// The password was right, so this was not an attack.
-	s.clearAttempts(email)
+	s.clearAttempts(byClient)
 
 	// State is checked after the password, on purpose. Checking first would
 	// tell anyone who guesses an address whether it has a pending account.
@@ -168,7 +208,11 @@ func (s *Service) SignIn(ctx context.Context, email, password string) (token, cs
 	case store.UserSuspended:
 		return "", "", ErrSuspended
 	}
+	return s.open(ctx, u)
+}
 
+// open makes a session for a person whose password was right.
+func (s *Service) open(ctx context.Context, u store.User) (token, csrf string, err error) {
 	if token, err = store.NewSessionToken(); err != nil {
 		return "", "", err
 	}
@@ -224,7 +268,7 @@ func (s *Service) CheckCSRF(sess store.Session, submitted string) bool {
 // Per address rather than per IP: an attacker has many addresses to come from
 // and only one to guess against, and limiting by IP would lock out everyone
 // behind one office NAT the moment somebody fat-fingers their password.
-func (s *Service) allowAttempt(email string) bool {
+func (s *Service) allowAttempt(email string, limit int) bool {
 	now := s.now()
 	s.mu.Lock()
 	defer s.mu.Unlock()
@@ -251,7 +295,20 @@ func (s *Service) allowAttempt(email string) bool {
 		return true
 	}
 	w.count++
-	return w.count <= s.cfg.MaxAttempts
+	return w.count <= limit
+}
+
+type clientKey struct{}
+
+// WithClient says which client a request comes from — its address — for the
+// sign-in throttle.
+func WithClient(ctx context.Context, client string) context.Context {
+	return context.WithValue(ctx, clientKey{}, client)
+}
+
+func clientFrom(ctx context.Context) string {
+	c, _ := ctx.Value(clientKey{}).(string)
+	return c
 }
 
 // maxTrackedAddresses bounds the throttle's memory. Unbounded, it grew by one
@@ -307,7 +364,7 @@ type PasswordChanger interface {
 func (s *Service) ChangePassword(ctx context.Context, pw PasswordChanger,
 	u store.User, current, next string,
 ) error {
-	if !s.allowAttempt("pw:" + u.ID) {
+	if !s.allowAttempt("pw:"+u.ID, s.cfg.MaxAttempts) {
 		return ErrTooManyTries
 	}
 	ok, err := VerifyPassword(current, u.PasswordHash)
@@ -348,3 +405,66 @@ func (s *Service) OpenSession(ctx context.Context, userID string) (token, csrf s
 	}
 	return token, csrf, nil
 }
+
+// ResetLinkTTL is how long a password reset link works.
+const ResetLinkTTL = time.Hour
+
+// ResetStore keeps password reset links.
+type ResetStore interface {
+	UserByEmail(ctx context.Context, email string) (store.User, error)
+	CreatePasswordReset(ctx context.Context, userID string, ttl time.Duration) (string, error)
+	PasswordResetUser(ctx context.Context, token string) (string, error)
+	UsePasswordReset(ctx context.Context, token string) (string, error)
+}
+
+// ErrNoReset is an address that gets no reset link: none has an account, the
+// account signs in through single sign-on, or it is not active. Never told to
+// whoever asked, who learns the same either way.
+var ErrNoReset = errors.New("no reset link for that address")
+
+// RequestReset mints a reset link token for the person an address belongs
+// to, when they sign in with a password and are active. A few a quarter of
+// an hour per address: each sends a mail.
+func (s *Service) RequestReset(ctx context.Context, rs ResetStore, email string) (string, store.User, error) {
+	email = store.NormalizeEmail(email)
+	if !validEmail(email) {
+		return "", store.User{}, ErrNoReset
+	}
+	if !s.allowAttempt("reset:"+email, 3) {
+		return "", store.User{}, ErrTooManyTries
+	}
+	u, err := rs.UserByEmail(ctx, email)
+	// An account whose password is kept elsewhere — "!oidc", "!scim",
+	// "!ldap" — gets no link: setting one here would give it a second way
+	// in that its directory knows nothing of, and outlives its leaving.
+	if err != nil || u.PasswordHash == "" || strings.HasPrefix(u.PasswordHash, "!") || u.State != store.UserActive {
+		return "", store.User{}, ErrNoReset
+	}
+	token, err := rs.CreatePasswordReset(ctx, u.ID, ResetLinkTTL)
+	if err != nil {
+		return "", store.User{}, err
+	}
+	s.log.Info("a password reset link was made", "user", u.ID)
+	return token, u, nil
+}
+
+// ResetPassword sets a password from a reset link, which is spent, and signs
+// the person out everywhere: if they lost it, someone else may have it.
+func (s *Service) ResetPassword(ctx context.Context, rs ResetStore, pw PasswordChanger, token, next string) error {
+	hash, err := HashPassword(next)
+	if err != nil {
+		return err
+	}
+	userID, err := rs.UsePasswordReset(ctx, token)
+	if err != nil {
+		return ErrNoReset
+	}
+	if err := pw.SetPassword(ctx, userID, hash); err != nil {
+		return err
+	}
+	if err := pw.DeleteUserSessions(ctx, userID); err != nil {
+		return err
+	}
+	s.log.Info("a password was set from a reset link", "user", userID)
+	return nil
+}

internal/account/throttle_bound_test.go

@@ -12,22 +12,22 @@ func TestSprayingAddressesCannotGrowTheThrottleOrEscapeIt(t *testing.T) {
 
 	// The target is being guessed at.
 	for i := 0; i < s.cfg.MaxAttempts; i++ {
-		s.allowAttempt("victim@example.com")
+		s.allowAttempt("victim@example.com", s.cfg.MaxAttempts)
 	}
 	// Then the table is flooded with made-up addresses.
 	for i := 0; i < maxTrackedAddresses+100; i++ {
-		s.allowAttempt(fmt.Sprintf("x%d@example.com", i))
+		s.allowAttempt(fmt.Sprintf("x%d@example.com", i), s.cfg.MaxAttempts)
 	}
 	if n := len(s.attempts); n > maxTrackedAddresses {
 		t.Errorf("the table grew to %d", n)
 	}
-	if s.allowAttempt("victim@example.com") {
+	if s.allowAttempt("victim@example.com", s.cfg.MaxAttempts) {
 		t.Error("flooding the table reset the target's throttle")
 	}
 
 	// Once the window passes, everything expires and sign-ins work again.
 	now = now.Add(s.cfg.AttemptWindow + time.Second)
-	if !s.allowAttempt("new@example.com") {
+	if !s.allowAttempt("new@example.com", s.cfg.MaxAttempts) {
 		t.Error("a new address was refused after the flood expired")
 	}
 }

internal/accounting/accounting.go

@@ -6,9 +6,11 @@ import (
 	"fmt"
 	"log/slog"
 	"strings"
+	"sync/atomic"
 	"time"
 
 	"gitea.mynodes.xyz/ilker/llmgw/internal/auth"
+	"gitea.mynodes.xyz/ilker/llmgw/internal/notify"
 	"gitea.mynodes.xyz/ilker/llmgw/internal/store"
 )
 
@@ -45,8 +47,13 @@ type Accountant struct {
 	tokens   *Limiter
 	recorder *Recorder
 	log      *slog.Logger
+	// notify is told when a budget runs out; nil tells no one.
+	notify atomic.Pointer[notify.Notifier]
 }
 
+// SetNotifier gives the accountant somewhere to say a budget is spent.
+func (a *Accountant) SetNotifier(n *notify.Notifier) { a.notify.Store(n) }
+
 // New builds an accountant.
 func New(pricing *Pricing, recorder *Recorder, log *slog.Logger) *Accountant {
 	if log == nil {
@@ -182,6 +189,10 @@ func (a *Accountant) Check(p auth.Principal, model string, estimatedTokens int64
 	if !price.Zero() {
 		for _, l := range chain {
 			if l.Budget != nil && a.budgets.Exhausted(l.Counter, l.Period, *l.Budget) {
+				a.notify.Load().Notify(notify.BudgetSpent, l.Counter,
+					fmt.Sprintf("the %s budget of %s is spent: requests to priced models are refused until it renews",
+						or(string(l.Period), "total"), l.Counter),
+					map[string]any{"counter": l.Counter, "period": string(l.Period), "budget": *l.Budget})
 				return res, &LimitError{Err: ErrBudgetSpent}
 			}
 		}
@@ -306,7 +317,13 @@ func (a *Accountant) Record(res Reservation, u store.Usage) {
 		a.tokens.Charge(c, actual-res.EstimatedTokens)
 	}
 
-	u.CostMicros = res.Price.Cost(u.PromptTokens, u.CompletionTokens)
+	// Priced by the model that answered: a fallback served by another model
+	// costs what that one costs, not what the one asked for would have.
+	price := res.Price
+	if u.ServedModel != "" && u.ServedModel != u.Model && a.pricing != nil {
+		price = a.pricing.For(u.ServedModel)
+	}
+	u.CostMicros = price.Cost(u.PromptTokens, u.CachedTokens, u.CompletionTokens, u.Images, u.Meshes)
 	for _, b := range res.Budgets {
 		a.budgets.Add(b.Counter, b.Period, u.CostMicros)
 	}
@@ -316,6 +333,17 @@ func (a *Accountant) Record(res Reservation, u store.Usage) {
 	}
 }
 
+// RecordRefused queues the row of a request a limit refused: nothing is
+// charged — it used nothing — but it is counted, so a team running into its
+// limits shows as one rather than as a team that went quiet.
+func (a *Accountant) RecordRefused(u store.Usage) {
+	if u.KeyID == "" || a.recorder == nil {
+		return
+	}
+	u.PromptTokens, u.CompletionTokens, u.CostMicros = 0, 0, 0
+	a.recorder.Record(u)
+}
+
 // Status returns what a key has used, for headers and `ctl`.
 func (a *Accountant) Status(p auth.Principal) (spent int64, rpm, tpm float64) {
 	if p.KeyID == "" {

internal/accounting/accounting_test.go

@@ -5,11 +5,14 @@ import (
 	"errors"
 	"log/slog"
 	"path/filepath"
+	"strings"
 	"sync"
 	"testing"
 	"time"
 
 	"gitea.mynodes.xyz/ilker/llmgw/internal/auth"
+	"gitea.mynodes.xyz/ilker/llmgw/internal/notify"
+	"gitea.mynodes.xyz/ilker/llmgw/internal/notify/notifytest"
 	"gitea.mynodes.xyz/ilker/llmgw/internal/store"
 )
 
@@ -36,17 +39,44 @@ func TestCostRoundsUpSoSmallRequestsAreNotFree(t *testing.T) {
 	// Rounding down would make a stream of tiny requests cost nothing, which is
 	// exactly the traffic shape a quota exists to bound.
 	p := Price{PromptPer1k: 1000, CompletionPer1k: 3000}
-	if got := p.Cost(1, 0); got != 1 {
+	if got := p.Cost(1, 0, 0, 0, 0); got != 1 {
 		t.Errorf("one prompt token cost %d", got)
 	}
-	if got := p.Cost(1000, 1000); got != 4000 {
+	if got := p.Cost(1000, 0, 1000, 0, 0); got != 4000 {
 		t.Errorf("a thousand of each cost %d, want 4000", got)
 	}
-	if got := p.Cost(0, 0); got != 0 {
+	if got := p.Cost(0, 0, 0, 0, 0); got != 0 {
 		t.Errorf("an empty request cost %d", got)
 	}
 }
 
+func TestACachedPromptCostsTheCachedRate(t *testing.T) {
+	p := Price{PromptPer1k: 1000, CachedPer1k: 100, CompletionPer1k: 3000}
+	// 10,000 prompt tokens of which 9,000 were read from the cache: 1,000 at
+	// the prompt rate and 9,000 at the cached one.
+	if got, want := p.Cost(10000, 9000, 0, 0, 0), int64(1000+900); got != want {
+		t.Errorf("a 90%% cached prompt cost %d, want %d", got, want)
+	}
+	// More cached than prompt is an engine's miscount, not a refund.
+	if got := p.Cost(100, 500, 0, 0, 0); got != 10 {
+		t.Errorf("cached beyond the prompt cost %d, want 10", got)
+	}
+	// No cached rate: cached tokens cost what any prompt token does.
+	if got := (Price{PromptPer1k: 1000}).Cost(10000, 9000, 0, 0, 0); got != 10000 {
+		t.Errorf("without a cached rate a cached prompt cost %d, want 10000", got)
+	}
+}
+
+func TestAPictureCostsItsPriceOnTopOfItsPrompt(t *testing.T) {
+	p := Price{PromptPer1k: 1000, PerImage: 50000}
+	if got := p.Cost(20, 0, 0, 3, 0); got != 20+150000 {
+		t.Errorf("three pictures from a 20-token prompt cost %d", got)
+	}
+	if (Price{PerImage: 1}).Zero() {
+		t.Error("a model priced per picture reads as free, and would pass a spent budget")
+	}
+}
+
 func TestZeroPricedModelsStayAvailableWhenTheBudgetIsSpent(t *testing.T) {
 	// This is what makes budget fallback work: a key with nothing left can
 	// still be served something that costs nothing.
@@ -658,3 +688,46 @@ func TestHeadroomIsTheTightestLimitAfterThisRequest(t *testing.T) {
 		t.Errorf("a key with no limits advertised some: %+v", none)
 	}
 }
+
+func TestAFallbackIsChargedWhatTheModelThatAnsweredCosts(t *testing.T) {
+	a := New(pricing(t), nil, slog.New(slog.DiscardHandler))
+	p := inTree("fb-k", teamBudget("fb", 1_000_000))
+	res, err := a.Check(p, "paid", 400)
+	if err != nil {
+		t.Fatal(err)
+	}
+	// Asked for "paid", answered by "free": nothing is owed.
+	a.Record(res, store.Usage{KeyID: "fb-k", Model: "paid", ServedModel: "free", PromptTokens: 200, CompletionTokens: 200})
+	if spent, _, _ := a.Status(p); spent != 0 {
+		t.Errorf("charged %d for a request the free model answered", spent)
+	}
+	res, _ = a.Check(p, "paid", 400)
+	a.Record(res, store.Usage{KeyID: "fb-k", Model: "paid", ServedModel: "paid", PromptTokens: 200, CompletionTokens: 200})
+	if spent, _, _ := a.Status(p); spent == 0 {
+		t.Error("the paid model answering cost nothing")
+	}
+}
+
+func TestASpentBudgetTellsSomeoneOnce(t *testing.T) {
+	a := New(pricing(t), nil, slog.New(slog.DiscardHandler))
+	n, sent := notifytest.Catch(t)
+	a.SetNotifier(n)
+	p := principal("k1", func(e *store.Effective) {
+		e.Budget = i64p(100)
+		e.BudgetPeriod = store.PeriodMonth
+	})
+	res, err := a.Check(p, "paid", 10)
+	if err != nil {
+		t.Fatal(err)
+	}
+	a.Record(res, store.Usage{KeyID: "k1", PromptTokens: 1000})
+	for range 3 {
+		if _, err := a.Check(p, "paid", 10); !errors.Is(err, ErrBudgetSpent) {
+			t.Fatalf("not refused: %v", err)
+		}
+	}
+	got := sent()
+	if len(got) != 1 || got[0].Kind != notify.BudgetSpent || !strings.Contains(got[0].Message, "month") {
+		t.Fatalf("sent %+v, want one budget_spent", got)
+	}
+}

internal/accounting/cost.go

@@ -18,6 +18,18 @@ import (
 type Price struct {
 	PromptPer1k     int64 `koanf:"prompt_per_1k"`
 	CompletionPer1k int64 `koanf:"completion_per_1k"`
+	// CachedPer1k is what a prompt token costs that the engine or provider
+	// read from its cache instead of computing: the part of prompt_tokens
+	// the answer counts as cached_tokens. Zero charges those at
+	// PromptPer1k, as before there was a rate for them.
+	CachedPer1k int64 `koanf:"cached_per_1k"`
+	// PerImage is what one picture costs, for a model that makes them: a
+	// picture's cost is the card's time, which its prompt's few tokens do
+	// not measure.
+	PerImage int64 `koanf:"per_image"`
+	// PerMesh is what one 3D model costs: minutes of a card, which no
+	// token count measures.
+	PerMesh int64 `koanf:"per_mesh"`
 }
 
 // Zero reports whether this model spends nothing.
@@ -25,14 +37,26 @@ type Price struct {
 // It matters beyond arithmetic: a zero-cost model stays available to a key
 // whose budget is spent, which is what makes the plan's budget fallback work
 // (§7.7).
-func (p Price) Zero() bool { return p.PromptPer1k == 0 && p.CompletionPer1k == 0 }
+func (p Price) Zero() bool {
+	return p.PromptPer1k == 0 && p.CompletionPer1k == 0 && p.CachedPer1k == 0 && p.PerImage == 0 && p.PerMesh == 0
+}
 
 // Cost computes what a request spent, rounding up.
 //
 // Up rather than to nearest: rounding down would make a stream of tiny requests
 // free, which is exactly the shape of traffic a quota exists to bound.
-func (p Price) Cost(promptTokens, completionTokens int64) int64 {
-	return divUp(promptTokens*p.PromptPer1k, 1000) + divUp(completionTokens*p.CompletionPer1k, 1000)
+//
+// cachedTokens are counted within promptTokens, as OpenAI's usage counts
+// them, and are charged at the cached rate instead of the prompt rate.
+func (p Price) Cost(promptTokens, cachedTokens, completionTokens, images, meshes int64) int64 {
+	cachedTokens = min(max(cachedTokens, 0), max(promptTokens, 0))
+	cachedRate := p.CachedPer1k
+	if cachedRate == 0 {
+		cachedRate = p.PromptPer1k
+	}
+	return divUp((promptTokens-cachedTokens)*p.PromptPer1k+cachedTokens*cachedRate, 1000) +
+		divUp(completionTokens*p.CompletionPer1k, 1000) +
+		max(images, 0)*p.PerImage + max(meshes, 0)*p.PerMesh
 }
 
 func divUp(n, d int64) int64 {

internal/agent/agent.go

@@ -6,21 +6,28 @@ import (
 	"crypto/sha256"
 	"crypto/tls"
 	"encoding/hex"
+	"encoding/json"
 	"errors"
 	"fmt"
 	"io"
 	"log/slog"
 	"maps"
+	"math"
 	"math/rand/v2"
 	"net"
 	"net/http"
+	"net/netip"
 	"os"
 	"path/filepath"
 	"runtime"
 	"slices"
+	"strconv"
 	"sync"
+	"sync/atomic"
 	"time"
 
+	"go.opentelemetry.io/otel/attribute"
+	"go.opentelemetry.io/otel/trace"
 	"golang.org/x/net/http2"
 
 	llmgwv1 "gitea.mynodes.xyz/ilker/llmgw/api/gen/llmgw/v1"
@@ -29,18 +36,25 @@ import (
 	"gitea.mynodes.xyz/ilker/llmgw/internal/agent/engines"
 	"gitea.mynodes.xyz/ilker/llmgw/internal/agent/provision"
 	"gitea.mynodes.xyz/ilker/llmgw/internal/agent/supervisor"
+	"gitea.mynodes.xyz/ilker/llmgw/internal/agent/train"
 	"gitea.mynodes.xyz/ilker/llmgw/internal/agent/weights"
 	"gitea.mynodes.xyz/ilker/llmgw/internal/control/agentsvc"
+	"gitea.mynodes.xyz/ilker/llmgw/internal/firewall"
+	"gitea.mynodes.xyz/ilker/llmgw/internal/kvevents"
+	"gitea.mynodes.xyz/ilker/llmgw/internal/obs"
 	"gitea.mynodes.xyz/ilker/llmgw/internal/tlsconf"
 )
 
 // Agent runs on a GPU node.
 type Agent struct {
-	cfg  Config
-	log  *slog.Logger
-	sup  *supervisor.Supervisor
-	reg  *engines.Registry
-	http connectHTTPClient
+	cfg Config
+	// answered says the current session heard from its control plane, which
+	// starts the reconnect backoff again when it ends.
+	answered atomic.Bool
+	log      *slog.Logger
+	sup      *supervisor.Supervisor
+	reg      *engines.Registry
+	http     connectHTTPClient
 
 	// engineOnce probes the configured engines once before registering.
 	//
@@ -73,8 +87,15 @@ type Agent struct {
 	lastEngineProbe time.Time
 	probingEngines  bool
 
-	mu  sync.Mutex
-	inv discovery.Inventory
+	mu sync.Mutex
+	// serverList is every control plane to dial: the configured ones, and
+	// any the leader has named since. Read through servers().
+	serverList []string
+	// fwMu keeps one firewall change at a time; fwRunner runs its scripts
+	// (nil: this machine's shell).
+	fwMu     sync.Mutex
+	fwRunner firewall.Runner
+	inv      discovery.Inventory
 	// shardReplica remembers which replica a shard belongs to, so a status
 	// report can name both. The control plane keys on the replica.
 	shardReplica map[string]string
@@ -104,12 +125,27 @@ type Agent struct {
 	// sensors reads heat and power: CPU and board from hwmon and RAPL, GPUs
 	// from nvidia-smi.
 	sensors *discovery.SensorSampler
+	// wear reads what wears a GPU out: remapped rows, PCIe retries, XIDs.
+	wear *discovery.HealthSampler
 
 	// fetchWatchers are the shards waiting on each source, so progress on one
 	// download reaches every shard that asked for it. A fetch is single-flight
 	// — eight shards starting together produce one download — and all eight
 	// are waiting, so all eight should say so.
 	fetchWatchers map[string][]func(weights.Progress)
+
+	// kv mirrors the KV caches of the engines that publish events, for the
+	// router's precise index; kvSubs are their listeners by shard, guarded
+	// by mu.
+	kv     *kvevents.Mirror
+	kvSubs map[string]*kvevents.Subscriber
+
+	// settingsCheck says whether the cluster's settings for this agent
+	// would load beside its agent.yaml; see SetSettingsCheck.
+	settingsCheck func([]byte) error
+
+	// trainer runs LoRA training jobs, one at a time (BACKLOG F4).
+	trainer *train.Runner
 }
 
 // connectHTTPClient is the HTTP client connect uses; an interface so tests can
@@ -150,8 +186,24 @@ func New(cfg Config, httpClient connectHTTPClient, log *slog.Logger) (*Agent, er
 		provKick:     make(chan struct{}, 1),
 		load:         discovery.NewLoadSampler(),
 		sensors:      discovery.NewSensorSampler(),
+		wear:         discovery.NewHealthSampler(),
+		serverList:   loadControlPlanes(cfg.Servers, cfg.TLS.Enabled()),
+		kv:           kvevents.NewMirror(),
+		kvSubs:       map[string]*kvevents.Subscriber{},
 	}
 	a.prov = &provision.Installer{Root: cfg.EnginesDir, Log: log, OnStatus: a.provisionStatus}
+	runAs := cfg.Superv.RunAs
+	if runAs == "" {
+		runAs = supervisor.DefaultRunAs
+	}
+	// Where the engines are, as the installer has it when the file says
+	// nothing.
+	enginesDir := cfg.EnginesDir
+	if enginesDir == "" {
+		enginesDir = provision.DefaultRoot
+	}
+	a.trainer = train.New(train.Env{EnginesDir: enginesDir, WorkDir: filepath.Join(cfg.Superv.WorkDir, "trainer"),
+		RunAs: runAs, Log: log})
 	return a, nil
 }
 
@@ -182,7 +234,9 @@ func (a *Agent) Run(ctx context.Context) error {
 	attempt := 0
 	next := 0
 	for ctx.Err() == nil {
-		server := a.cfg.Servers[next%len(a.cfg.Servers)]
+		// Read each time round: the leader may have named another since.
+		servers := a.servers()
+		server := servers[next%len(servers)]
 		err := a.session(ctx, server)
 		if ctx.Err() != nil {
 			break
@@ -192,17 +246,25 @@ func (a *Agent) Run(ctx context.Context) error {
 		// never answers — from here they are the same thing, and trying
 		// somewhere else is the answer to all three.
 		next++
+		// A session that was answered was a connection that worked, however
+		// it ended: the backoff starts again rather than carrying on from
+		// the last outage. Without this every failover the agent lived
+		// through made the next one slower — the third waited half a minute
+		// on a control plane that had been ready for twenty seconds.
+		if a.answered.Swap(false) {
+			attempt = 0
+		}
 		attempt++
 		delay := a.reconnectDelay(attempt)
 		// No wait when there is somewhere else to try: the delay exists to
 		// stop hammering one control plane, and the next address has not been
 		// hammered. With a single address this is the old behaviour exactly.
-		if len(a.cfg.Servers) > 1 && next%len(a.cfg.Servers) != 0 {
+		if len(servers) > 1 && next%len(servers) != 0 {
 			delay = 0
 		}
 		a.log.Warn("disconnected from the control plane, retrying",
 			"err", err, "server", server,
-			"next", a.cfg.Servers[next%len(a.cfg.Servers)],
+			"next", servers[next%len(servers)],
 			"in", delay.Round(time.Millisecond), "attempt", attempt)
 
 		select {
@@ -266,6 +328,12 @@ func (a *Agent) recoverOrphans() {
 			a.mu.Lock()
 			a.shardReplica[o.ShardID] = o.ReplicaID
 			a.mu.Unlock()
+			// The engine is still publishing to the port the last agent
+			// listened on; listen there again.
+			if o.Spec.KVEventsPort > 0 {
+				spec := o.Spec
+				a.listenKV(&spec, o.Spec.KVEventsPort)
+			}
 			a.log.Info("adopted a running engine",
 				"shard", o.ShardID, "replica", o.ReplicaID, "pid", o.PID)
 			go a.settleAdopted(sh, o)
@@ -301,7 +369,7 @@ func (a *Agent) settleAdopted(sh *supervisor.Shard, o supervisor.Orphan) {
 	// The same two paths a freshly started shard takes: a rank that serves HTTP
 	// is health-checked, a worker is judged by staying alive.
 	if eng.ServesHTTP(o.Spec) {
-		base := fmt.Sprintf("http://127.0.0.1:%d", o.Spec.HTTPPort)
+		base := a.engineBase(o.Spec)
 		err = a.sup.WaitReady(ctx, sh, base, o.Spec.Profile.ServedModelName, a.cfg.AdoptReadyTimeout)
 	} else {
 		err = a.sup.WaitAlive(ctx, sh)
@@ -314,6 +382,26 @@ func (a *Agent) settleAdopted(sh *supervisor.Shard, o supervisor.Orphan) {
 			"shard", o.ShardID, "replica", o.ReplicaID, "err", err)
 		return
 	}
+	// An engine started by an agent older than the GPU check may be one
+	// serving a GPU placement on the CPU. Stopped, so its replacement starts
+	// through the check and fails there in words, if the build still sees
+	// no GPU — rather than going on unnoticed after the upgrade that could
+	// have caught it.
+	if err := a.onItsGPUs(ctx, eng, o.Spec, sh.Status().PID); err != nil {
+		a.log.Error("stopping an adopted engine that computes on the CPU though placed on GPUs",
+			"shard", o.ShardID, "replica", o.ReplicaID, "err", err)
+		_ = a.sup.Stop(ctx, o.ShardID)
+		return
+	}
+	// What it computes on, for one started before the agent kept that — or
+	// kept as the CPU for a GPU placement by an agent that did not follow
+	// an engine into a process group of its own, which the check above has
+	// just found on its GPUs.
+	if c := a.sup.ComputeOf(o.ShardID); c == nil || (len(o.Spec.GPUIndices) > 0 && c.Backend == "CPU") {
+		if c, ok := a.gpuCompute(ctx, o.Spec.GPUIndices, sh.Status().PID); ok {
+			a.sup.SetCompute(o.ShardID, c)
+		}
+	}
 	a.log.Info("adopted engine is serving",
 		"shard", o.ShardID, "replica", o.ReplicaID)
 }
@@ -354,6 +442,17 @@ func (a *Agent) weights() *weights.Fetcher {
 }
 
 // runningShards describes what this agent is supervising, for registration.
+// unready are the shards a registration reported as not yet ready.
+func unready(running []*llmgwv1.RunningShard) map[string]bool {
+	out := map[string]bool{}
+	for _, r := range running {
+		if r.GetState() != agentsvc.StateToWire(supervisor.Ready) {
+			out[r.GetShardId()] = true
+		}
+	}
+	return out
+}
+
 func (a *Agent) runningShards() []*llmgwv1.RunningShard {
 	var out []*llmgwv1.RunningShard
 	for _, st := range a.sup.Statuses() {
@@ -379,6 +478,7 @@ func (a *Agent) runningShards() []*llmgwv1.RunningShard {
 			Pool:       spec.Pool,
 			Fabric:     spec.Fabric,
 			ProfileFp:  spec.ProfileFP,
+			Compute:    computeToWire(a.sup.ComputeOf(st.ID)),
 			LeaderAddr: a.cfg.MgmtAddr,
 			LeaderPort: int32(spec.LeaderPort),
 		})
@@ -397,6 +497,17 @@ func int32Slice(v []int) []int32 {
 	return out
 }
 
+func int32Ints(v []int32) []int {
+	out := make([]int, len(v))
+	for i, x := range v {
+		out[i] = int(x)
+	}
+	return out
+}
+
+// tracerName names the spans the agent opens.
+const tracerName = "gitea.mynodes.xyz/ilker/llmgw/internal/agent"
+
 // scan refreshes the node's hardware inventory.
 func (a *Agent) scan(ctx context.Context) error {
 	// Carried from the agent's own configuration rather than duplicated into
@@ -406,6 +517,7 @@ func (a *Agent) scan(ctx context.Context) error {
 	inv, err := discovery.Discover(ctx, opts, a.log)
 	host := discovery.DiscoverHost()
 	host.MinComputeCapability = discovery.MinComputeCapability(inv.GPUs)
+	host.MemBandwidthGBs = a.memBandwidth()
 	a.mu.Lock()
 	a.inv = inv
 	a.prov.Host = host
@@ -450,7 +562,7 @@ func (a *Agent) session(ctx context.Context, server string) error {
 	// vLLM accepted a vLLM shard and failed it minutes later.
 	reg.EngineVersions = a.engines(parent)
 	reg.EnginesProbed = true
-	reg.InstallableEngines = provision.Installable()
+	reg.InstallableEngines = slices.DeleteFunc(provision.Installable(), a.disabled)
 	reg.Features = []string{FeatureFabricTest}
 	reg.RunningShards = a.runningShards()
 	a.mu.Lock()
@@ -462,6 +574,9 @@ func (a *Agent) session(ctx context.Context, server string) error {
 	reg.Host = &llmgwv1.Host{
 		OsId: h.OSID, OsVersion: h.OSVersion, OsCodename: h.OSCodename,
 		Arch: h.Arch, CpuFlags: h.CPUFlags, NvidiaDriver: h.NVIDIADriver,
+		// What is measured by now, not what the startup scan found before
+		// the measurement ended: a reconnect would otherwise say 0.
+		MemBandwidthGbs: a.memBandwidth(),
 	}
 
 	if err := stream.Send(&llmgwv1.AgentMessage{
@@ -496,6 +611,9 @@ func (a *Agent) session(ctx context.Context, server string) error {
 		a.sendLoop(ctx, stream, out)
 	}()
 	defer wg.Wait()
+	go a.watchExits(ctx, out, unready(reg.RunningShards))
+	go a.forwardKV(ctx, out)
+	go a.reportCompute(ctx, out)
 
 	for {
 		msg, err := stream.Receive()
@@ -515,6 +633,7 @@ func (a *Agent) session(ctx context.Context, server string) error {
 			// why it is not registering is one an operator cannot fix.
 			return err
 		}
+		a.answered.Store(true)
 		a.handle(ctx, msg, out)
 	}
 }
@@ -555,6 +674,7 @@ func (a *Agent) heartbeat() *llmgwv1.AgentMessage {
 	// without anybody restarting anything.
 	hb.MemoryTotalMb = int64(discovery.MemoryTotalMB())
 	hb.CpuCount = int32(runtime.NumCPU())
+	hb.MemBandwidthGbs = a.memBandwidth()
 
 	a.reprobeEngines()
 	a.mu.Lock()
@@ -577,8 +697,24 @@ func (a *Agent) heartbeat() *llmgwv1.AgentMessage {
 	}
 	a.mu.Unlock()
 
-	for _, g := range inv.GPUs {
-		hb.GpuMemoryUsedMb = append(hb.GpuMemoryUsedMb, int32(g.MemoryUsedMB))
+	// Measured now, not carried from registration: a card is shared with
+	// whatever else runs on the machine, and that comes and goes while the
+	// agent runs. The registration figure stays only for a node where
+	// nvidia-smi cannot be asked.
+	if len(inv.GPUs) > 0 {
+		var shards []int
+		for _, st := range a.sup.Statuses() {
+			if st.PID > 0 {
+				shards = append(shards, st.PID)
+			}
+		}
+		hb.GpuForeignMemoryMb, hb.GpuMemoryUsedMb = a.foreignGPUMemory(context.Background(), shards)
+	}
+	if len(hb.GpuMemoryUsedMb) != len(inv.GPUs) {
+		hb.GpuForeignMemoryMb, hb.GpuMemoryUsedMb = nil, nil
+		for _, g := range inv.GPUs {
+			hb.GpuMemoryUsedMb = append(hb.GpuMemoryUsedMb, int32(g.MemoryUsedMB))
+		}
 	}
 
 	// Rescanned here rather than reused from registration. Disk is not a fact
@@ -645,11 +781,34 @@ func (a *Agent) sampleLoad() *llmgwv1.NodeLoad {
 	if a.sensors != nil {
 		se := a.sensors.Sample(context.Background())
 		out.CpuTempC, out.CpuPowerW, out.InletTempC = se.CPUTempC, se.CPUPowerW, se.InletTempC
+		var wear map[int]discovery.GPUWear
+		if a.wear != nil && len(se.GPUs) > 0 {
+			wear = map[int]discovery.GPUWear{}
+			for _, w := range a.wear.Sample(context.Background()) {
+				wear[w.Index] = w
+			}
+		}
 		for _, g := range se.GPUs {
-			out.Gpus = append(out.Gpus, &llmgwv1.GPUSensor{
+			gs := &llmgwv1.GPUSensor{
 				Index: int32(g.Index), TempC: g.TempC, MemoryTempC: g.MemoryTempC,
 				PowerW: g.PowerW, PowerLimitW: g.PowerLimitW, Throttle: g.Throttle,
-			})
+				UtilizationPercent: g.UtilPercent, MemoryUtilizationPercent: g.MemUtilPercent,
+				MemoryUsedMb: g.MemoryUsedMB, MemoryTotalMb: g.MemoryTotalMB,
+				SmClockMhz: g.SMClockMHz, EccUncorrected: g.ECCUncorrected,
+			}
+			if w, ok := wear[g.Index]; ok {
+				gs.HasWear = true
+				gs.PcieReplays, gs.RetiredPagesSbe, gs.RetiredPagesDbe, gs.RetirementPending =
+					w.PCIeReplays, w.RetiredSBE, w.RetiredDBE, w.RetirePending
+				gs.RemappedRowsCorrectable, gs.RemappedRowsUncorrectable, gs.RemapPending, gs.RemapFailure =
+					w.RemappedCorrectable, w.RemappedUncorrectable, w.RemapPending, w.RemapFailure
+				gs.NvlinkCrcErrors, gs.NvlinkReplayErrors, gs.NvlinkRecoveryErrors = w.NVLinkCRC, w.NVLinkReplay, w.NVLinkRecovery
+				gs.XidErrors, gs.LastXid, gs.LastXidText = w.XIDs, int32(w.LastXID), w.LastXIDText
+				if !w.LastXIDAt.IsZero() {
+					gs.LastXidUnix = w.LastXIDAt.Unix()
+				}
+			}
+			out.Gpus = append(out.Gpus, gs)
 		}
 	}
 	return out
@@ -724,21 +883,47 @@ func (a *Agent) removeWeights(paths []string) {
 }
 
 func (a *Agent) handle(ctx context.Context, msg *llmgwv1.ControlMessage, out chan<- *llmgwv1.AgentMessage) {
+	// The control plane's span that sent this, when it is tracing: what is
+	// done here for a start or a stop goes into the same trace.
+	tctx := obs.Extract(ctx, msg.GetTrace())
 	switch m := msg.Msg.(type) {
 	case *llmgwv1.ControlMessage_Start:
-		go a.startShard(ctx, m.Start, out)
+		go a.startShard(tctx, m.Start, out)
 	case *llmgwv1.ControlMessage_Stop:
-		go a.stopShard(ctx, m.Stop.GetShardId(), out)
+		go a.stopShard(tctx, m.Stop.GetShardId(), out)
 	case *llmgwv1.ControlMessage_Drain:
-		if err := a.sup.Drain(m.Drain.GetShardId()); err != nil {
+		_, span := obs.Tracer(tracerName).Start(tctx, "drain shard",
+			trace.WithSpanKind(trace.SpanKindConsumer),
+			trace.WithAttributes(attribute.String("llmgw.shard", m.Drain.GetShardId())))
+		err := a.sup.Drain(m.Drain.GetShardId())
+		if err != nil {
 			a.log.Warn("draining failed", "shard", m.Drain.GetShardId(), "err", err)
 		}
+		obs.End(span, err)
 	case *llmgwv1.ControlMessage_RemoveWeights:
 		a.removeWeights(m.RemoveWeights.GetPaths())
 	case *llmgwv1.ControlMessage_Provision:
 		a.setProvision(m.Provision)
 	case *llmgwv1.ControlMessage_Upgrade:
 		go a.upgrade(ctx, m.Upgrade, out)
+	case *llmgwv1.ControlMessage_ControlPlanes:
+		a.setControlPlanes(m.ControlPlanes)
+	case *llmgwv1.ControlMessage_Firewall:
+		go a.applyFirewall(m.Firewall)
+	case *llmgwv1.ControlMessage_AgentSettings:
+		go a.applySettings(m.AgentSettings)
+	case *llmgwv1.ControlMessage_TrainStart:
+		go a.trainJob(ctx, m.TrainStart, out)
+	case *llmgwv1.ControlMessage_TrainCancel:
+		a.trainer.Cancel(m.TrainCancel.GetJobId())
+	case *llmgwv1.ControlMessage_RestartAgent:
+		go func() {
+			a.log.Info("restarting, as the control plane asks; the engines keep serving",
+				"reason", m.RestartAgent.GetReason())
+			// A moment for the log line to leave before the process does.
+			time.Sleep(300 * time.Millisecond)
+			exitForUpgrade()
+		}()
 	case *llmgwv1.ControlMessage_Logs:
 		reply := a.logsReply(m.Logs)
 		// Off the receive loop: a full send queue must not stop commands being
@@ -824,9 +1009,64 @@ func (a *Agent) watchFetch(source string, fn func(weights.Progress)) (stop func(
 	}
 }
 
+// bindAddr is where engines listen: the management address the control
+// plane reaches them on, not every address the node has — a public one
+// included. Empty, on every address, when that is a name rather than an
+// address this machine holds.
+func (a *Agent) bindAddr() string {
+	ip, err := netip.ParseAddr(a.cfg.MgmtAddr)
+	if err != nil || ip.IsUnspecified() || !localAddr(ip) {
+		return ""
+	}
+	return ip.String()
+}
+
+// engineBase is where the agent asks an engine whether it is ready: where it
+// listens, loopback when that is every address.
+func (a *Agent) engineBase(s engines.ShardSpec) string {
+	host := s.BindAddr
+	if host == "" {
+		host = "127.0.0.1"
+	}
+	return "http://" + net.JoinHostPort(host, strconv.Itoa(s.HTTPPort))
+}
+
+// localAddr reports whether an address is one of this machine's.
+func localAddr(ip netip.Addr) bool {
+	addrs, err := net.InterfaceAddrs()
+	if err != nil {
+		return false
+	}
+	for _, a := range addrs {
+		if p, err := netip.ParsePrefix(a.String()); err == nil && p.Addr().Unmap() == ip.Unmap() {
+			return true
+		}
+	}
+	return false
+}
+
 func (a *Agent) startShard(ctx context.Context, m *llmgwv1.StartShard, out chan<- *llmgwv1.AgentMessage) {
 	shardID, replicaID := m.GetShardId(), m.GetReplicaId()
 
+	// This node's whole part of the start, from the command arriving to the
+	// engine answering, beneath the control plane's span that sent it. The
+	// steps — weights, launch, readiness — are its children.
+	ctx, span := obs.Tracer(tracerName).Start(ctx, "start shard",
+		trace.WithSpanKind(trace.SpanKindConsumer),
+		trace.WithAttributes(
+			attribute.String("llmgw.node", a.cfg.NodeID),
+			attribute.String("llmgw.replica", replicaID),
+			attribute.String("llmgw.shard", shardID),
+			attribute.Int("llmgw.rank", int(m.GetRank())),
+			attribute.String("llmgw.model", m.GetProfile().GetServedModelName()),
+			attribute.String("llmgw.profile", m.GetProfile().GetName()),
+			attribute.String("llmgw.engine", m.GetProfile().GetEngine()),
+			attribute.String("llmgw.gpu_class", m.GetProfile().GetGpuClass()),
+			attribute.IntSlice("llmgw.gpus", int32Ints(m.GetGpuIndices())),
+		))
+	var failed error
+	defer func() { obs.End(span, failed) }()
+
 	a.mu.Lock()
 	a.shardReplica[shardID] = replicaID
 	a.mu.Unlock()
@@ -839,6 +1079,9 @@ func (a *Agent) startShard(ctx context.Context, m *llmgwv1.StartShard, out chan<
 		}
 	}
 	report := func(st supervisor.State, errMsg string, tail []string) {
+		if st == supervisor.Failed {
+			failed = errors.New(errMsg)
+		}
 		send(&llmgwv1.ShardStatus{
 			State: agentsvc.StateToWire(st), Error: errMsg, LastOutput: tail,
 		})
@@ -846,6 +1089,7 @@ func (a *Agent) startShard(ctx context.Context, m *llmgwv1.StartShard, out chan<
 
 	spec, timeout := agentsvc.ShardSpecFromStart(m)
 	a.localizeSpec(&spec)
+	spec.BindAddr = a.bindAddr()
 
 	eng, err := a.reg.Get(spec.Profile.Engine)
 	if err != nil {
@@ -859,6 +1103,12 @@ func (a *Agent) startShard(ctx context.Context, m *llmgwv1.StartShard, out chan<
 
 	// Validate before launching. An engine that refuses a profile does so after
 	// minutes of loading; catching it here costs nothing.
+	// Checked again here, whatever sent the profile: this is the process
+	// about to run as root.
+	if err := engines.UnsafeArgs(spec.Profile.Engine, spec.Profile.Args); err != nil {
+		report(supervisor.Failed, err.Error(), nil)
+		return
+	}
 	if err := eng.Validate(spec.Profile, gpuInfo(inv, spec.GPUIndices)); err != nil {
 		report(supervisor.Failed, err.Error(), nil)
 		return
@@ -883,7 +1133,7 @@ func (a *Agent) startShard(ctx context.Context, m *llmgwv1.StartShard, out chan<
 			},
 		})
 	})
-	if path, err := a.weights().Ensure(ctx, spec.Profile.ModelPath); err != nil {
+	if path, err := a.weights().Ensure(ctx, spec.Profile.ModelPath, spec.Profile.AllowPickle); err != nil {
 		stop()
 		report(supervisor.Failed, err.Error(), nil)
 		return
@@ -891,9 +1141,56 @@ func (a *Agent) startShard(ctx context.Context, m *llmgwv1.StartShard, out chan<
 		stop()
 		spec.Profile.ModelPath = path
 	}
+	// A shared ComfyUI replica's members' weights, each fetched like the
+	// model's, and handed to the gate where they landed.
+	if raw := spec.Profile.Env[engines.SharedModelsEnv]; raw != "" {
+		var ms []map[string]string
+		if err := json.Unmarshal([]byte(raw), &ms); err != nil {
+			report(supervisor.Failed, "the shared replica's models are not readable: "+err.Error(), nil)
+			return
+		}
+		for i, m := range ms {
+			stop := a.watchFetch(m["source"], func(p weights.Progress) {
+				send(&llmgwv1.ShardStatus{State: agentsvc.StateToWire(supervisor.Starting),
+					Fetch: &llmgwv1.FetchProgress{Source: p.Source, BytesDone: p.BytesDone, BytesTotal: p.BytesTotal}})
+			})
+			path, err := a.weights().Ensure(ctx, m["source"], m["allow_pickle"] == "true")
+			stop()
+			if err != nil {
+				report(supervisor.Failed, fmt.Sprintf("model %s: %v", m["name"], err), nil)
+				return
+			}
+			ms[i]["path"] = path
+		}
+		b, _ := json.Marshal(ms)
+		spec.Profile.Env = maps.Clone(spec.Profile.Env)
+		spec.Profile.Env[engines.SharedModelsEnv] = string(b)
+	}
+	// Adapters are fetched like the model, and before the engine starts: it
+	// loads them at start, and one missing is a replica that answers for the
+	// base model under the adapter's name.
+	for i, ad := range spec.Profile.Adapters {
+		path, err := a.weights().Ensure(ctx, ad.Path, spec.Profile.AllowPickle)
+		if err != nil {
+			report(supervisor.Failed, fmt.Sprintf("adapter %s: %v", ad.Name, err), nil)
+			return
+		}
+		spec.Profile.Adapters[i].Path = path
+	}
+	// Adapters that load on demand are loaded by the router, by a path that
+	// has to mean the same file on every node: a link of the adapter's name
+	// in the directory engines run in.
+	if spec.Profile.RuntimeLoRA() {
+		if err := engines.LinkRuntimeAdapters(a.sup.EngineDir(), spec.Profile.Adapters); err != nil {
+			report(supervisor.Failed, err.Error(), nil)
+			return
+		}
+	}
 
+	a.listenKV(&spec, 0)
 	cmds, err := eng.Commands(spec)
 	if err != nil {
+		a.stopKV(shardID, replicaID)
 		report(supervisor.Failed, err.Error(), nil)
 		return
 	}
@@ -906,6 +1203,7 @@ func (a *Agent) startShard(ctx context.Context, m *llmgwv1.StartShard, out chan<
 			report(sh.Status().State, "", nil)
 			return
 		}
+		a.stopKV(shardID, replicaID)
 		report(supervisor.Failed, err.Error(), sh.Logs(10))
 		return
 	}
@@ -915,46 +1213,117 @@ func (a *Agent) startShard(ctx context.Context, m *llmgwv1.StartShard, out chan<
 	// staying alive, and the replica's real readiness is the leader answering,
 	// which only happens once every worker has joined (plan §11, phase 4).
 	if eng.ServesHTTP(spec) {
-		base := fmt.Sprintf("http://127.0.0.1:%d", spec.HTTPPort)
+		base := a.engineBase(spec)
 		err = a.sup.WaitReady(ctx, sh, base, spec.Profile.ServedModelName, timeout)
 	} else {
 		err = a.sup.WaitAlive(ctx, sh)
 	}
+	// Where it put the model, by its own account: said with the readiness,
+	// and a GPU placement it computes on the CPU refused even where
+	// nvidia-smi cannot be asked.
+	compute, said, cerr := engineCompute(eng, spec.GPUIndices, sh.Logs(512))
+	if err == nil && cerr != nil {
+		err = cerr
+		_ = a.sup.Stop(ctx, shardID)
+	}
+	if err == nil {
+		err = a.onItsGPUs(ctx, eng, spec, sh.Status().PID)
+		if err != nil {
+			// Serving, but not where it was placed: stopped, so the GPU it
+			// holds in the inventory is not taken by a CPU process.
+			_ = a.sup.Stop(ctx, shardID)
+		}
+	}
 	if err != nil {
 		report(supervisor.Failed, err.Error(), sh.Logs(20))
 		return
 	}
-	report(supervisor.Ready, "", nil)
-
-	// Watch for the engine dying later. Nothing else would notice: the router
-	// would simply see failing requests.
-	go a.watch(ctx, sh, replicaID, shardID, out)
+	// The engine's own account when it gave one, with its layers; else what
+	// nvidia-smi sees the shard holding.
+	if !said {
+		compute, said = a.gpuCompute(ctx, spec.GPUIndices, sh.Status().PID)
+	}
+	if said {
+		// Kept with the shard, so an agent restarted, or a control plane
+		// taking over, still learns it.
+		a.sup.SetCompute(shardID, compute)
+		send(&llmgwv1.ShardStatus{State: agentsvc.StateToWire(supervisor.Ready), Compute: computeToWire(&compute)})
+	} else {
+		report(supervisor.Ready, "", nil)
+	}
+	// Its dying later is reported by the session's watchExits.
 }
 
-// watch reports a shard that exits after it was ready.
-func (a *Agent) watch(ctx context.Context, sh *supervisor.Shard, replicaID, shardID string, out chan<- *llmgwv1.AgentMessage) {
+// watchExits reports, for as long as this session lasts, every shard that
+// was ready and has failed: the ones this agent started, and the ones it
+// adopted from the agent before it.
+//
+// Per session rather than per shard. A watcher tied to the stream a shard
+// was started on stopped with that stream, so after a reconnect nothing
+// reported the engine dying; and an adopted engine had no watcher at all —
+// on node06 one was killed and its replica stayed "ready" for the control
+// plane, routed to and failing, indefinitely.
+//
+// It also reports the shards the registration said were not ready yet once
+// they are. An adopted engine is health-checked after the agent registers,
+// and a shard started on the stream before is reported on that stream; so
+// when the registration came first nothing ever told the control plane, and
+// the replica stayed "starting" while it served — on node05, after a
+// control plane restart, the only replica of a model.
+func (a *Agent) watchExits(ctx context.Context, out chan<- *llmgwv1.AgentMessage, pending map[string]bool) {
 	t := time.NewTicker(time.Second)
 	defer t.Stop()
-
+	ready := map[string]bool{}
 	for {
+		for _, st := range a.sup.Statuses() {
+			switch st.State {
+			case supervisor.Ready:
+				ready[st.ID] = true
+				if !pending[st.ID] {
+					continue
+				}
+				delete(pending, st.ID)
+				sh, err := a.sup.Get(st.ID)
+				if err != nil {
+					continue
+				}
+				msg := &llmgwv1.AgentMessage{Msg: &llmgwv1.AgentMessage_Shard{Shard: &llmgwv1.ShardStatus{
+					NodeId: a.cfg.NodeID, ReplicaId: sh.Spec.ReplicaID, ShardId: st.ID,
+					State:   agentsvc.StateToWire(st.State),
+					Compute: computeToWire(a.sup.ComputeOf(st.ID)),
+				}}}
+				select {
+				case out <- msg:
+				case <-ctx.Done():
+					return
+				}
+			case supervisor.Failed:
+				if !ready[st.ID] {
+					continue // never ready here: its start reported it
+				}
+				delete(ready, st.ID)
+				sh, err := a.sup.Get(st.ID)
+				if err != nil {
+					continue
+				}
+				msg := &llmgwv1.AgentMessage{Msg: &llmgwv1.AgentMessage_Shard{Shard: &llmgwv1.ShardStatus{
+					NodeId: a.cfg.NodeID, ReplicaId: sh.Spec.ReplicaID, ShardId: st.ID,
+					State: agentsvc.StateToWire(st.State), Error: st.Err,
+					ExitCode: int32(st.ExitCode), LastOutput: sh.Logs(20),
+				}}}
+				select {
+				case out <- msg:
+				case <-ctx.Done():
+					return
+				}
+			default:
+				delete(ready, st.ID)
+			}
+		}
 		select {
 		case <-ctx.Done():
 			return
 		case <-t.C:
-			st := sh.Status()
-			if !st.State.Terminal() {
-				continue
-			}
-			msg := &llmgwv1.AgentMessage{Msg: &llmgwv1.AgentMessage_Shard{Shard: &llmgwv1.ShardStatus{
-				NodeId: a.cfg.NodeID, ReplicaId: replicaID, ShardId: shardID,
-				State: agentsvc.StateToWire(st.State), Error: st.Err,
-				ExitCode: int32(st.ExitCode), LastOutput: sh.Logs(20),
-			}}}
-			select {
-			case out <- msg:
-			case <-ctx.Done():
-			}
-			return
 		}
 	}
 }
@@ -965,9 +1334,19 @@ func (a *Agent) stopShard(ctx context.Context, shardID string, out chan<- *llmgw
 	delete(a.shardReplica, shardID)
 	a.mu.Unlock()
 
-	if err := a.sup.Stop(ctx, shardID); err != nil {
+	ctx, span := obs.Tracer(tracerName).Start(ctx, "stop shard",
+		trace.WithSpanKind(trace.SpanKindConsumer),
+		trace.WithAttributes(
+			attribute.String("llmgw.node", a.cfg.NodeID),
+			attribute.String("llmgw.replica", replicaID),
+			attribute.String("llmgw.shard", shardID),
+		))
+	err := a.sup.Stop(ctx, shardID)
+	if err != nil {
 		a.log.Warn("stopping a shard failed", "shard", shardID, "err", err)
 	}
+	a.stopKV(shardID, replicaID)
+	obs.End(span, err)
 	a.sup.Remove(shardID)
 
 	msg := &llmgwv1.AgentMessage{Msg: &llmgwv1.AgentMessage_Shard{Shard: &llmgwv1.ShardStatus{
@@ -1012,7 +1391,9 @@ func Client(cfg tlsconf.Config, timeout time.Duration) (*http.Client, error) {
 	if !cfg.Enabled() {
 		return &http.Client{
 			Transport: &http2.Transport{
-				AllowHTTP: true,
+				AllowHTTP:       true,
+				ReadIdleTimeout: streamIdle,
+				PingTimeout:     streamPing,
 				DialTLSContext: func(ctx context.Context, network, addr string, _ *tls.Config) (net.Conn, error) {
 					return (&net.Dialer{Timeout: timeout}).DialContext(ctx, network, addr)
 				},
@@ -1027,25 +1408,52 @@ func Client(cfg tlsconf.Config, timeout time.Duration) (*http.Client, error) {
 	if err != nil {
 		return nil, err
 	}
-	return &http.Client{Transport: &http2.Transport{TLSClientConfig: tc}}, nil
+	return &http.Client{Transport: &http2.Transport{
+		TLSClientConfig: tc,
+		ReadIdleTimeout: streamIdle,
+		PingTimeout:     streamPing,
+		// Bounded, as the plaintext branch's is: dialling a control plane
+		// whose machine is off waits out the kernel's connect retries,
+		// about two minutes, before the next address is tried.
+		DialTLSContext: func(ctx context.Context, network, addr string, c *tls.Config) (net.Conn, error) {
+			d := tls.Dialer{NetDialer: &net.Dialer{Timeout: timeout}, Config: c}
+			return d.DialContext(ctx, network, addr)
+		},
+	}}, nil
 }
 
+// A stream to a control plane whose machine stopped dead — powered off, cut
+// off — is never closed: nothing sends the FIN, and the agent's heartbeats sit
+// in the socket's buffer until the kernel gives up retransmitting, fifteen
+// minutes later. Found by switching off a leader: the standby took over in 14
+// seconds and the node stayed with the dead one. An HTTP/2 ping after five
+// quiet seconds, given three to answer, finds it in eight: by the time the
+// standby leads, as it does within the lease's ten seconds, the node is on
+// its way to it. At fifteen, with the lease at fifteen too, the new leader
+// went without its nodes, and so its judges, for half a minute.
+const (
+	streamIdle = 5 * time.Second
+	streamPing = 3 * time.Second
+)
+
 // localizeSpec fills in what only this node knows.
 //
 // The interface NCCL bootstraps over is this node's, not the cluster's: the
 // control plane sends one name for every node, and a node whose management
-// network is on ens3 rather than eth0 would have NCCL bind nothing. And on
-// RoCE, which GID entry routes is a property of these adapters.
+// network is on ens3 rather than eth0 would have NCCL bind nothing. On RoCE,
+// which GID entry routes is a property of these adapters. And a MIG instance
+// is opened by its UUID, which only this node knows.
 func (a *Agent) localizeSpec(spec *engines.ShardSpec) {
 	if a.cfg.MgmtInterface != "" {
 		spec.MgmtInterface = a.cfg.MgmtInterface
 	}
+	a.mu.Lock()
+	hcas, gpus := a.inv.HCAs, a.inv.GPUs
+	a.mu.Unlock()
+	spec.GPUUUIDs = migUUIDs(gpus, spec.GPUIndices)
 	if len(spec.HCAs) == 0 {
 		return
 	}
-	a.mu.Lock()
-	hcas := a.inv.HCAs
-	a.mu.Unlock()
 	want := map[string]bool{}
 	for _, h := range spec.HCAs {
 		want[h] = true
@@ -1064,6 +1472,27 @@ func (a *Agent) localizeSpec(spec *engines.ShardSpec) {
 	}
 }
 
+// migUUIDs names a shard's devices by UUID when one of them is a MIG
+// instance, and is nil otherwise: whole cards keep being given by index, as
+// they always were. A device this node does not have is left to fail where
+// it always has, in the engine, rather than guessed at here.
+func migUUIDs(gpus []discovery.GPU, indices []int) []string {
+	var out []string
+	mig := false
+	for _, i := range indices {
+		k := slices.IndexFunc(gpus, func(g discovery.GPU) bool { return g.Index == i })
+		if k < 0 || gpus[k].UUID == "" {
+			return nil
+		}
+		mig = mig || gpus[k].IsMIG()
+		out = append(out, gpus[k].UUID)
+	}
+	if !mig {
+		return nil
+	}
+	return out
+}
+
 // ResolveManagement is the address and interface this node's agent would use,
 // found the way normalize finds them, for a tool that reports them.
 func ResolveManagement(c Config) (addr, iface string) {
@@ -1080,3 +1509,84 @@ func ResolveManagement(c Config) (addr, iface string) {
 	}
 	return addr, iface
 }
+
+// reportCompute tells the control plane, once a session, what each running
+// shard computes on as soon as that is known: an adopted engine's is found
+// after registration, which carried what was known then.
+func (a *Agent) reportCompute(ctx context.Context, out chan<- *llmgwv1.AgentMessage) {
+	// What was sent for each shard, so a compute that changes is sent again:
+	// an adopted shard's kept one is sent at once, and adopting it may then
+	// find it was kept wrong.
+	sent := map[string]string{}
+	t := time.NewTicker(5 * time.Second)
+	defer t.Stop()
+	for range 60 {
+		for _, st := range a.sup.Statuses() {
+			if st.State.Terminal() {
+				continue
+			}
+			c := a.sup.ComputeOf(st.ID)
+			if c == nil {
+				continue
+			}
+			said := fmt.Sprint(*c)
+			if sent[st.ID] == said {
+				continue
+			}
+			sh, err := a.sup.Get(st.ID)
+			if err != nil {
+				continue
+			}
+			// No state: a report of compute alone, not a transition.
+			msg := &llmgwv1.AgentMessage{Msg: &llmgwv1.AgentMessage_Shard{Shard: &llmgwv1.ShardStatus{
+				NodeId: a.cfg.NodeID, ReplicaId: sh.Spec.ReplicaID, ShardId: st.ID, Compute: computeToWire(c),
+			}}}
+			select {
+			case out <- msg:
+				sent[st.ID] = said
+			case <-ctx.Done():
+				return
+			}
+		}
+		select {
+		case <-ctx.Done():
+			return
+		case <-t.C:
+		}
+	}
+}
+
+// memBandwidth is the node's memory read rate in GB/s, 0 until measured.
+// Measured in the background, the first time it is asked for: it reads half
+// a gigabyte, which must not hold up an agent reaching its control plane,
+// and the heartbeat carries it when it is known. Not at once but after a
+// minute or so, chosen at random, and again every hour, keeping the best:
+// VMs on one host that all restart together measure each other, and read a
+// third less than any of them gets alone. Once a process rather than an
+// agent, so tests running many agents in one read it once.
+func (a *Agent) memBandwidth() float64 {
+	bwOnce.Do(func() {
+		go func() {
+			time.Sleep(bandwidthDelay())
+			for {
+				if bw := measureBandwidth(); bw > math.Float64frombits(bwBits.Load()) {
+					bwBits.Store(math.Float64bits(bw))
+					a.log.Info("this node's memory", "read_gbs", math.Round(bw*10)/10)
+				}
+				time.Sleep(time.Hour)
+			}
+		}()
+	})
+	return math.Float64frombits(bwBits.Load())
+}
+
+// bandwidthDelay is how long an agent waits before measuring, so agents
+// started together measure apart.
+var bandwidthDelay = func() time.Duration { return 10*time.Second + rand.N(110*time.Second) }
+
+var (
+	bwOnce sync.Once
+	bwBits atomic.Uint64
+	// measureBandwidth is replaced in tests, which have no use for it.
+	measureBandwidth = discovery.MeasureMemoryBandwidth
+)

internal/agent/agent_test.go

@@ -37,11 +37,12 @@ import (
 type statusRecorder struct {
 	ch chan status
 
-	mu      sync.Mutex
-	calls   []adoptCall
-	adopted []reconciler.AdoptedShard
-	unclaim []string // shard ids to report back as unclaimed
-	fetches []fetchReport
+	mu       sync.Mutex
+	calls    []adoptCall
+	adopted  []reconciler.AdoptedShard
+	unclaim  []string // shard ids to report back as unclaimed
+	fetches  []fetchReport
+	computes []reconciler.Compute
 }
 
 type status struct {
@@ -61,6 +62,12 @@ func (r *statusRecorder) OnShardStatus(replicaID, shardID string, st supervisor.
 
 // fetches records download progress, so a test can assert that a fetch is
 // visible from the control plane rather than only in the node's log.
+func (r *statusRecorder) OnShardCompute(replicaID, shardID string, c reconciler.Compute) {
+	r.mu.Lock()
+	defer r.mu.Unlock()
+	r.computes = append(r.computes, c)
+}
+
 func (r *statusRecorder) OnFetchProgress(replicaID, shardID, source string, done, total int64) {
 	r.mu.Lock()
 	defer r.mu.Unlock()
@@ -664,7 +671,7 @@ func TestAShardWithMissingWeightsFailsBeforeLaunching(t *testing.T) {
 	// nobody is watching — so it is caught here, where the message can say
 	// what is actually wrong.
 	a := &Agent{cfg: Config{WeightsCache: t.TempDir()}, log: slog.New(slog.DiscardHandler)}
-	_, err := a.weights().Ensure(t.Context(), filepath.Join(t.TempDir(), "not-there.gguf"))
+	_, err := a.weights().Ensure(t.Context(), filepath.Join(t.TempDir(), "not-there.gguf"), false)
 	if err == nil {
 		t.Fatal("a missing weights file was accepted")
 	}

internal/agent/bindaddr_test.go

@@ -0,0 +1,30 @@
+package agent
+
+import (
+	"testing"
+
+	"gitea.mynodes.xyz/ilker/llmgw/internal/agent/engines"
+)
+
+func TestEnginesListenOnTheManagementAddressWhenItIsThisMachines(t *testing.T) {
+	cases := map[string]string{
+		"127.0.0.1":   "127.0.0.1", // one of this machine's
+		"203.0.113.9": "",          // not: every address rather than none
+		"gpu07.lan":   "",          // a name
+		"0.0.0.0":     "",
+		"":            "",
+	}
+	for mgmt, want := range cases {
+		a := &Agent{cfg: Config{MgmtAddr: mgmt}}
+		if got := a.bindAddr(); got != want {
+			t.Errorf("management address %q: listens on %q, expected %q", mgmt, got, want)
+		}
+	}
+	a := &Agent{}
+	if got := a.engineBase(engines.ShardSpec{HTTPPort: 8000}); got != "http://127.0.0.1:8000" {
+		t.Errorf("on every address, asked at %s", got)
+	}
+	if got := a.engineBase(engines.ShardSpec{HTTPPort: 8000, BindAddr: "10.0.0.147"}); got != "http://10.0.0.147:8000" {
+		t.Errorf("on one address, asked at %s", got)
+	}
+}

internal/agent/config.go

@@ -14,6 +14,7 @@ import (
 	"gitea.mynodes.xyz/ilker/llmgw/internal/agent/engines"
 	"gitea.mynodes.xyz/ilker/llmgw/internal/agent/supervisor"
 	"gitea.mynodes.xyz/ilker/llmgw/internal/control/inventory"
+	"gitea.mynodes.xyz/ilker/llmgw/internal/obs"
 	"gitea.mynodes.xyz/ilker/llmgw/internal/tlsconf"
 )
 
@@ -94,7 +95,19 @@ type Config struct {
 	Engines   engines.Config    `koanf:"engines"`
 	Superv    supervisor.Config `koanf:"supervisor"`
 
+	// Tracing sends this node's part of each replica start — the weights
+	// fetched, the engine launched, the wait for it to answer — to an
+	// OpenTelemetry collector, inside the control plane's trace of that
+	// start. Give it the collector server.yaml's tracing names. Off unless
+	// an endpoint is set here or in OTEL_EXPORTER_OTLP_ENDPOINT.
+	Tracing obs.Tracing `koanf:"tracing"`
+
 	Version string
+
+	// Settings is the cluster's settings for this agent it was started on,
+	// as the control plane sent them: what a newly sent version is
+	// compared with.
+	Settings string `koanf:"-"`
 }
 
 // DefaultConfig returns sensible defaults.

internal/agent/controlplanes.go

@@ -0,0 +1,77 @@
+package agent
+
+import (
+	"encoding/json"
+	"os"
+	"path/filepath"
+	"slices"
+
+	llmgwv1 "gitea.mynodes.xyz/ilker/llmgw/api/gen/llmgw/v1"
+)
+
+// controlPlanesFile keeps the control planes the leader last named, beside
+// the agent's configuration rather than in it: the configuration is the
+// operator's, and a list rewritten in it would be a file nobody wrote.
+var controlPlanesFile = "/var/lib/llmgw-agent/control-planes.json"
+
+// servers is every address to dial, in the order to try them: the
+// configuration's, then any the leader named that it lacks.
+func (a *Agent) servers() []string {
+	a.mu.Lock()
+	defer a.mu.Unlock()
+	if len(a.serverList) == 0 {
+		return a.cfg.Servers
+	}
+	return a.serverList
+}
+
+// mergeServers puts the leader's list after the configured one, without
+// repeats, and says whether that changed anything.
+func mergeServers(configured, told []string, secure bool) []string {
+	out := slices.Clone(configured)
+	for _, s := range told {
+		fixed, err := normalizeOne(s, secure)
+		if err != nil {
+			continue
+		}
+		if !slices.Contains(out, fixed) {
+			out = append(out, fixed)
+		}
+	}
+	return out
+}
+
+// setControlPlanes takes the leader's list: used from the next reconnect,
+// and kept for the next start.
+func (a *Agent) setControlPlanes(m *llmgwv1.ControlPlanes) {
+	told := m.GetServers()
+	merged := mergeServers(a.cfg.Servers, told, a.cfg.TLS.Enabled())
+	a.mu.Lock()
+	changed := !slices.Equal(merged, a.serverList)
+	a.serverList = merged
+	a.mu.Unlock()
+	if !changed {
+		return
+	}
+	a.log.Info("the control planes to dial", "servers", merged)
+	b, _ := json.Marshal(told)
+	if err := os.MkdirAll(filepath.Dir(controlPlanesFile), 0o755); err == nil {
+		tmp := controlPlanesFile + ".new"
+		if err := os.WriteFile(tmp, b, 0o644); err == nil {
+			_ = os.Rename(tmp, controlPlanesFile)
+		}
+	}
+}
+
+// loadControlPlanes is the list kept from the last time the leader named it.
+func loadControlPlanes(configured []string, secure bool) []string {
+	b, err := os.ReadFile(controlPlanesFile)
+	if err != nil {
+		return configured
+	}
+	var told []string
+	if json.Unmarshal(b, &told) != nil {
+		return configured
+	}
+	return mergeServers(configured, told, secure)
+}

internal/agent/controlplanes_test.go

@@ -0,0 +1,41 @@
+package agent
+
+import (
+	"log/slog"
+	"path/filepath"
+	"slices"
+	"testing"
+
+	llmgwv1 "gitea.mynodes.xyz/ilker/llmgw/api/gen/llmgw/v1"
+	"gitea.mynodes.xyz/ilker/llmgw/internal/tlsconf"
+)
+
+func TestAControlPlaneTheLeaderNamesIsDialledAndRemembered(t *testing.T) {
+	old := controlPlanesFile
+	controlPlanesFile = filepath.Join(t.TempDir(), "control-planes.json")
+	t.Cleanup(func() { controlPlanesFile = old })
+
+	configured := []string{"https://10.0.0.140:7443"}
+	// TLS on, as every onboarded node has it: an agent without it refuses
+	// https:// addresses, and the leader's are https://.
+	a := &Agent{cfg: Config{Servers: configured, TLS: tlsconf.Config{CA: "/etc/llmgw/ca.pem"}}, log: slog.New(slog.DiscardHandler)}
+	if got := a.servers(); !slices.Equal(got, configured) {
+		t.Fatalf("before anything is named: %v", got)
+	}
+	// The configured one stays first; the new one is added after it, once.
+	a.setControlPlanes(&llmgwv1.ControlPlanes{Servers: []string{"https://10.0.0.140:7443", "https://10.0.0.150:7443"}})
+	want := []string{"https://10.0.0.140:7443", "https://10.0.0.150:7443"}
+	if got := a.servers(); !slices.Equal(got, want) {
+		t.Errorf("after the leader named two: %v", got)
+	}
+	// And after a restart, before the leader says anything.
+	if got := loadControlPlanes(configured, true); !slices.Equal(got, want) {
+		t.Errorf("after a restart: %v", got)
+	}
+	// A list that drops the configured one does not drop it: the
+	// configuration is the operator's.
+	a.setControlPlanes(&llmgwv1.ControlPlanes{Servers: []string{"https://10.0.0.150:7443"}})
+	if got := a.servers(); got[0] != "https://10.0.0.140:7443" {
+		t.Errorf("the configured server was dropped: %v", got)
+	}
+}

internal/agent/disabled_test.go

@@ -0,0 +1,32 @@
+package agent
+
+import (
+	"testing"
+
+	llmgwv1 "gitea.mynodes.xyz/ilker/llmgw/api/gen/llmgw/v1"
+	"gitea.mynodes.xyz/ilker/llmgw/internal/agent/engines"
+)
+
+func TestAnEngineDisabledOnTheNodeIsNeitherInstalledNorAdvertised(t *testing.T) {
+	a := &Agent{}
+	a.cfg.Engines.Disabled = []string{"vllm"}
+	a.setProvision(&llmgwv1.Provision{Engines: []*llmgwv1.EngineWant{
+		{Engine: "llamacpp", Version: "b1"}, {Engine: "vllm", Version: "0.30.0"},
+	}})
+	if len(a.provWants) != 1 || a.provWants[0].Engine != "llamacpp" {
+		t.Errorf("wants %+v: vLLM is disabled here and must not be installed", a.provWants)
+	}
+	a.configuredVers = map[string]string{"vllm": "0.25.0"}
+	a.installedVers = map[string]string{"llamacpp": "b1"}
+	if got := a.engineReportLocked(); got["vllm"] != "" || got["llamacpp"] != "b1" {
+		t.Errorf("advertised %v: a disabled engine found on disk is still not offered", got)
+	}
+}
+
+func TestAnEngineNamedByHandIsNotInstalledOverIt(t *testing.T) {
+	a := &Agent{reg: engines.NewRegistry(engines.Config{LlamaCpp: engines.LlamaCppConfig{Bin: "/opt/own/llama-server"}})}
+	a.setProvision(&llmgwv1.Provision{Engines: []*llmgwv1.EngineWant{{Engine: "llamacpp", Version: "b1"}}})
+	if len(a.provWants) != 0 {
+		t.Errorf("wants %+v: an installed build would be used over the operator's own", a.provWants)
+	}
+}

internal/agent/discovery/gpu.go

@@ -47,6 +47,13 @@ type GPU struct {
 	Fabric *GPUFabric `json:"fabric,omitempty"`
 	// Health carries anything that should keep the GPU out of placement.
 	Health GPUHealth `json:"health"`
+	// MIG is set when this is a MIG instance rather than a whole card: its
+	// Index is then MIGIndex's, its UUID the instance's (MIG-…), and its
+	// memory the instance's share. Utilisation stays unreported, because no
+	// driver measures it per instance.
+	MIG *MIGDevice `json:"mig,omitempty"`
+	// PCIe is how the card is linked to its host, zero when not read.
+	PCIe PCIeLink `json:"pcie,omitempty"`
 }
 
 // GPUHealth records conditions that make a GPU unsafe to schedule onto.
@@ -94,8 +101,30 @@ func (g GPU) Class() string {
 	}
 
 	// Round to the nearest GiB: vendors report 81559 MiB for an "80GB" card.
-	gb := int(math.Round(float64(g.MemoryTotalMB) / 1024))
-	return fmt.Sprintf("%s-%dg", model, gb)
+	// A MIG instance is named from its card's memory and then its profile,
+	// so two instances are one class only when both the card and the slice
+	// are the same.
+	mem := g.MemoryTotalMB
+	if g.MIG != nil {
+		mem = g.MIG.ParentMemoryTotalMB
+	}
+	gb := int(math.Round(float64(mem) / 1024))
+	class := fmt.Sprintf("%s-%dg", model, gb)
+	if g.MIG != nil {
+		return migClass(class, g.MIG.Profile)
+	}
+	return class
+}
+
+// normalizeBusID makes bus ids comparable: NVML reports them uppercase from one
+// call and lowercase from another, and sometimes with a shortened domain.
+func normalizeBusID(s string) string {
+	s = strings.ToLower(strings.TrimSpace(s))
+	// "0000:1b:00.0" and "00000000:1B:00.0" are the same device.
+	if i := strings.Index(s, ":"); i > 0 {
+		s = strings.TrimLeft(s[:i], "0") + s[i:]
+	}
+	return strings.TrimPrefix(s, ":")
 }
 
 // MarshalJSON adds the derived class, so a consumer of the JSON does not have

internal/agent/discovery/gpu_nvml.go

@@ -14,7 +14,6 @@ package discovery
 import (
 	"context"
 	"fmt"
-	"strings"
 
 	"github.com/NVIDIA/go-nvml/pkg/nvml"
 )
@@ -68,10 +67,23 @@ func DiscoverGPUsNVML(_ context.Context) ([]GPU, error) {
 		if major, minor, ret := dev.GetCudaComputeCapability(); ret == nvml.SUCCESS {
 			g.ComputeCapability = fmt.Sprintf("%d.%d", major, minor)
 		}
+		if v, ret := dev.GetMaxPcieLinkGeneration(); ret == nvml.SUCCESS {
+			g.PCIe.Gen = v
+		}
+		if v, ret := dev.GetGpuMaxPcieLinkGeneration(); ret == nvml.SUCCESS {
+			g.PCIe.GPUGen = v
+		}
+		if v, ret := dev.GetCurrPcieLinkWidth(); ret == nvml.SUCCESS {
+			g.PCIe.Width = v
+		}
+		if v, ret := dev.GetMaxPcieLinkWidth(); ret == nvml.SUCCESS {
+			g.PCIe.WidthMax = v
+		}
 		if pci, ret := dev.GetPciInfo(); ret == nvml.SUCCESS {
 			g.PCIBusID = busIDString(pci.BusId[:])
 			byBusID[normalizeBusID(g.PCIBusID)] = i
 		}
+		g.PCIe = withSysfs(g.PCIe, "/sys/bus/pci/devices", g.PCIBusID)
 		if t, ret := dev.GetTemperature(nvml.TEMPERATURE_GPU); ret == nvml.SUCCESS {
 			g.Health.TemperatureC = int(t)
 		}
@@ -83,11 +95,18 @@ func DiscoverGPUsNVML(_ context.Context) ([]GPU, error) {
 		}
 
 		assessHealth(&g)
-		gpus = append(gpus, g)
+		// A card in MIG mode is its instances, not itself: CUDA will not
+		// open the whole card while MIG is on.
+		devs, _ := migFromNVML(g, nvmlCard{dev})
+		gpus = append(gpus, devs...)
 	}
 
-	// A second pass, because a link's remote end may be a GPU enumerated later.
+	// A second pass, because a link's remote end may be a GPU enumerated
+	// later. MIG instances have no NVLink of their own to use.
 	for i := range gpus {
+		if gpus[i].IsMIG() {
+			continue
+		}
 		dev, ret := nvml.DeviceGetHandleByIndex(gpus[i].Index)
 		if ret != nvml.SUCCESS {
 			continue
@@ -136,13 +155,73 @@ func busIDString(b []int8) string {
 	return string(buf)
 }
 
-// normalizeBusID makes bus ids comparable: NVML reports them uppercase from one
-// call and lowercase from another, and sometimes with a shortened domain.
-func normalizeBusID(s string) string {
-	s = strings.ToLower(strings.TrimSpace(s))
-	// "0000:1b:00.0" and "00000000:1B:00.0" are the same device.
-	if i := strings.Index(s, ":"); i > 0 {
-		s = strings.TrimLeft(s[:i], "0") + s[i:]
+// nvmlCard adapts an NVML device to what MIG discovery reads of it.
+type nvmlCard struct{ dev nvml.Device }
+
+func (c nvmlCard) MIGMode() (current, pending, ok bool) {
+	cur, pend, ret := c.dev.GetMigMode()
+	if ret != nvml.SUCCESS {
+		// NOT_SUPPORTED on a card without MIG, which is most of them.
+		return false, false, false
 	}
-	return strings.TrimPrefix(s, ":")
+	return cur == nvml.DEVICE_MIG_ENABLE, pend == nvml.DEVICE_MIG_ENABLE, true
+}
+
+func (c nvmlCard) MaxMIGDevices() int {
+	n, ret := c.dev.GetMaxMigDeviceCount()
+	if ret != nvml.SUCCESS {
+		return 0
+	}
+	return n
+}
+
+func (c nvmlCard) MIGDevice(i int) (nvmlMIGInstance, bool) {
+	h, ret := c.dev.GetMigDeviceHandleByIndex(i)
+	if ret != nvml.SUCCESS {
+		// NOT_FOUND for an index with no instance: the count is the most a
+		// card can hold, not how many it has.
+		return nil, false
+	}
+	return nvmlMIG{h}, true
+}
+
+// nvmlMIG adapts a MIG device handle.
+type nvmlMIG struct{ dev nvml.Device }
+
+func (m nvmlMIG) UUID() string {
+	u, _ := m.dev.GetUUID()
+	return u
+}
+
+func (m nvmlMIG) Name() string {
+	n, _ := m.dev.GetName()
+	return n
+}
+
+func (m nvmlMIG) Memory() (totalMB, usedMB int, ok bool) {
+	mem, ret := m.dev.GetMemoryInfo()
+	if ret != nvml.SUCCESS {
+		return 0, 0, false
+	}
+	return int(mem.Total / (1 << 20)), int(mem.Used / (1 << 20)), true
+}
+
+func (m nvmlMIG) Instances() (gpuInstance, computeInstance int) {
+	gi, ret := m.dev.GetGpuInstanceId()
+	if ret != nvml.SUCCESS {
+		gi = -1
+	}
+	ci, ret := m.dev.GetComputeInstanceId()
+	if ret != nvml.SUCCESS {
+		ci = -1
+	}
+	return gi, ci
+}
+
+func (m nvmlMIG) Attributes() (slices, memoryMB int, ok bool) {
+	a, ret := m.dev.GetAttributes()
+	if ret != nvml.SUCCESS {
+		return 0, 0, false
+	}
+	return int(a.GpuInstanceSliceCount), int(a.MemorySizeMB), true
 }

internal/agent/discovery/gpu_smi.go

@@ -60,7 +60,34 @@ func DiscoverGPUsSMI(ctx context.Context, binary string) ([]GPU, error) {
 	if err != nil {
 		return nil, fmt.Errorf("running %s: %w", binary, err)
 	}
-	return parseSMI(string(out))
+	cards, err := parseSMI(string(out))
+	if err != nil || len(cards) == 0 {
+		return cards, err
+	}
+	readPCIe(ctx, binary, cards)
+	// The query lists whole cards, MIG mode or not. A card in MIG mode is
+	// replaced by its instances, which only -L names and only the full
+	// report sizes; asked only when some card could be in MIG mode, since
+	// the report is the slowest thing nvidia-smi does.
+	if !anyMIGCapable(cards) {
+		return cards, nil
+	}
+	listed, report := readMIG(ctx, binary)
+	return expandMIG(cards, listed, report), nil
+}
+
+// anyMIGCapable reports whether any card could be in MIG mode: MIG began
+// with compute capability 8.0 (the A100). The consumer cards of the same
+// generations have none, but telling them apart by name is guesswork, and
+// asking one costs only two more nvidia-smi runs at registration.
+func anyMIGCapable(cards []GPU) bool {
+	for _, c := range cards {
+		major, _, _ := strings.Cut(c.ComputeCapability, ".")
+		if n, err := strconv.Atoi(major); err == nil && n >= 8 {
+			return true
+		}
+	}
+	return false
 }
 
 func parseSMI(out string) ([]GPU, error) {
@@ -106,9 +133,27 @@ func parseSMI(out string) ([]GPU, error) {
 	return gpus, nil
 }
 
-// residentMemoryToleranceMB is how much allocated memory is written off as
+// ForeignMemoryToleranceMB is how much allocated memory is written off as
 // driver overhead rather than a foreign process.
-const residentMemoryToleranceMB = 512
+const ForeignMemoryToleranceMB = 512
+
+// foreignMemorySuffix ends the problem a card with another tenant on it is
+// kept out of placement for. One phrase, so that the control plane can find
+// it again and drop it when the tenant leaves.
+const foreignMemorySuffix = " MiB already allocated by another process"
+
+// ForeignMemoryProblem is the problem for mb of memory held by something
+// that is not one of this agent's engines, or "" when that is too little to
+// count.
+func ForeignMemoryProblem(mb int) string {
+	if mb <= ForeignMemoryToleranceMB {
+		return ""
+	}
+	return fmt.Sprintf("%d%s", mb, foreignMemorySuffix)
+}
+
+// IsForeignMemoryProblem reports whether a problem is ForeignMemoryProblem's.
+func IsForeignMemoryProblem(p string) bool { return strings.HasSuffix(p, foreignMemorySuffix) }
 
 // assessHealth flags conditions that should keep a GPU out of placement.
 func assessHealth(g *GPU) {
@@ -119,8 +164,12 @@ func assessHealth(g *GPU) {
 	// Memory already in use means something else is on the card. Starting an
 	// engine there would either fail to allocate or quietly evict the other
 	// process's throughput.
-	if g.MemoryUsedMB > residentMemoryToleranceMB {
-		g.Health.Problems = append(g.Health.Problems,
-			fmt.Sprintf("%d MiB already allocated by another process", g.MemoryUsedMB))
+	//
+	// Only a first reading: this runs before the agent knows which processes
+	// are its own, so an engine still running from before a restart reads as
+	// foreign here. Every heartbeat measures it again, without the agent's
+	// own engines, and the control plane replaces this with that.
+	if p := ForeignMemoryProblem(g.MemoryUsedMB); p != "" {
+		g.Health.Problems = append(g.Health.Problems, p)
 	}
 }

internal/agent/discovery/gpuhealth.go

@@ -0,0 +1,280 @@
+package discovery
+
+import (
+	"context"
+	"encoding/xml"
+	"os/exec"
+	"regexp"
+	"strconv"
+	"strings"
+	"sync"
+	"time"
+)
+
+// GPUWear is what wears a card out or takes it down, beyond temperature:
+// read every minute, from nvidia-smi and the kernel's log. The early signs of
+// a card failing are here — a growing count of rows its memory had to remap,
+// PCIe link retries, XID errors — long before a replica on it fails.
+//
+// A count of -1 is not reported: a card without row remapping (before
+// Ampere) has no such count, which is not the same as none.
+type GPUWear struct {
+	Index int
+	// PCIeReplays are link-level retries on the card's PCIe link: a few are
+	// noise, a count that keeps climbing is a riser, slot or cable.
+	PCIeReplays int64
+	// RetiredSBE and RetiredDBE are memory pages retired for single and
+	// double bit errors (cards before Ampere); RetirePending is a page
+	// waiting for a reset to be retired.
+	RetiredSBE, RetiredDBE int64
+	RetirePending          bool
+	// RemappedCorrectable and RemappedUncorrectable are memory rows remapped
+	// (Ampere and later). RemapPending waits for a reset; RemapFailure is a
+	// card out of spare rows — it needs replacing.
+	RemappedCorrectable, RemappedUncorrectable int64
+	RemapPending, RemapFailure                 bool
+	// NVLink errors summed over the card's links, by kind.
+	NVLinkCRC, NVLinkReplay, NVLinkRecovery int64
+	// XIDs are the driver's error events for this card since the agent
+	// started, and the last of them.
+	XIDs        int64
+	LastXID     int
+	LastXIDText string
+	LastXIDAt   time.Time
+}
+
+// healthEvery is how often health is read: it changes over hours, and the
+// kernel log and nvidia-smi's full report are the heavier reads.
+const healthEvery = time.Minute
+
+// HealthSampler reads GPUWear, keeping the XID counts between reads.
+type HealthSampler struct {
+	run func(ctx context.Context, name string, args ...string) ([]byte, error)
+	now func() time.Time
+
+	mu      sync.Mutex
+	at      time.Time
+	last    []GPUWear
+	since   time.Time
+	xids    map[int]*GPUWear
+	started bool
+}
+
+// NewHealthSampler reads the machine's own nvidia-smi and kernel log.
+func NewHealthSampler() *HealthSampler {
+	return &HealthSampler{now: time.Now, xids: map[int]*GPUWear{},
+		run: func(ctx context.Context, name string, args ...string) ([]byte, error) {
+			return exec.CommandContext(ctx, name, args...).Output() //nolint:gosec // fixed tools
+		}}
+}
+
+// Sample is the cards' health, read again once healthEvery has passed. Nil
+// on a machine without nvidia-smi.
+func (h *HealthSampler) Sample(ctx context.Context) []GPUWear {
+	h.mu.Lock()
+	defer h.mu.Unlock()
+	now := h.now()
+	if !h.at.IsZero() && now.Sub(h.at) < healthEvery {
+		return h.last
+	}
+	h.at = now
+	ctx, cancel := context.WithTimeout(ctx, 15*time.Second)
+	defer cancel()
+	report, err := h.run(ctx, "nvidia-smi", "-q", "-x")
+	if err != nil {
+		h.last = nil
+		return nil
+	}
+	cards, bus := parseHealthReport(report)
+	if out, err := h.run(ctx, "nvidia-smi", "nvlink", "-e"); err == nil {
+		for i, e := range parseNVLinkErrors(string(out)) {
+			if i < len(cards) {
+				cards[i].NVLinkCRC, cards[i].NVLinkReplay, cards[i].NVLinkRecovery = e[0], e[1], e[2]
+			}
+		}
+	}
+	h.readXIDs(ctx, now, bus)
+	for i := range cards {
+		if x := h.xids[i]; x != nil {
+			cards[i].XIDs, cards[i].LastXID, cards[i].LastXIDText, cards[i].LastXIDAt = x.XIDs, x.LastXID, x.LastXIDText, x.LastXIDAt
+		}
+	}
+	h.last = cards
+	return cards
+}
+
+// readXIDs adds the XID events logged since the last read. The first read
+// starts from now: what happened before the agent started was before, and
+// counting the whole log would raise every alert on every restart.
+func (h *HealthSampler) readXIDs(ctx context.Context, now time.Time, bus map[string]int) {
+	if !h.started {
+		h.started, h.since = true, now
+		return
+	}
+	since := h.since
+	h.since = now
+	out, err := h.run(ctx, "journalctl", "-k", "--no-pager", "-o", "short-unix",
+		"--since", "@"+strconv.FormatInt(since.Unix(), 10), "-g", "NVRM: Xid")
+	if err != nil {
+		// No journal, or nothing matched (journalctl exits 1 for that).
+		return
+	}
+	for _, e := range parseXIDs(string(out)) {
+		i, ok := bus[e.bus]
+		if !ok {
+			continue
+		}
+		x := h.xids[i]
+		if x == nil {
+			x = &GPUWear{Index: i}
+			h.xids[i] = x
+		}
+		x.XIDs++
+		x.LastXID, x.LastXIDText = e.code, e.text
+		x.LastXIDAt = now
+		if e.at > 0 {
+			x.LastXIDAt = time.Unix(int64(e.at), 0)
+		}
+	}
+}
+
+// healthLog is the part of nvidia-smi's XML report health is read from.
+type healthLog struct {
+	GPUs []struct {
+		ID  string `xml:"id,attr"`
+		PCI struct {
+			Replay string `xml:"replay_counter"`
+		} `xml:"pci"`
+		Retired struct {
+			SBE     string `xml:"multiple_single_bit_retirement>retired_count"`
+			DBE     string `xml:"double_bit_retirement>retired_count"`
+			Pending string `xml:"pending_retirement"`
+			// Older drivers name it pending_blacklist.
+			Blacklist string `xml:"pending_blacklist"`
+		} `xml:"retired_pages"`
+		Remapped struct {
+			Corr    string `xml:"remapped_row_corr"`
+			Unc     string `xml:"remapped_row_unc"`
+			Pending string `xml:"remapped_row_pending"`
+			Failure string `xml:"remapped_row_failure"`
+		} `xml:"remapped_rows"`
+	} `xml:"gpu"`
+}
+
+// parseHealthReport reads each card's health, in index order, and maps each
+// card's PCI bus ("3b:00", as the kernel names it) to its index.
+func parseHealthReport(report []byte) ([]GPUWear, map[string]int) {
+	var log healthLog
+	if err := xml.Unmarshal(report, &log); err != nil {
+		return nil, nil
+	}
+	bus := map[string]int{}
+	out := make([]GPUWear, 0, len(log.GPUs))
+	for i, g := range log.GPUs {
+		bus[busOf(g.ID)] = i
+		out = append(out, GPUWear{
+			Index:                 i,
+			PCIeReplays:           count(g.PCI.Replay),
+			RetiredSBE:            count(g.Retired.SBE),
+			RetiredDBE:            count(g.Retired.DBE),
+			RetirePending:         yes(g.Retired.Pending) || yes(g.Retired.Blacklist),
+			RemappedCorrectable:   count(g.Remapped.Corr),
+			RemappedUncorrectable: count(g.Remapped.Unc),
+			RemapPending:          yes(g.Remapped.Pending),
+			RemapFailure:          yes(g.Remapped.Failure),
+		})
+	}
+	return out, bus
+}
+
+// busOf is a PCI address as the kernel's XID lines carry it: nvidia-smi
+// says "00000000:3B:00.0", the kernel "0000:3b:00".
+func busOf(id string) string {
+	id = strings.ToLower(strings.TrimSpace(id))
+	if i := strings.LastIndex(id, "."); i >= 0 {
+		id = id[:i]
+	}
+	parts := strings.Split(id, ":")
+	if len(parts) >= 2 {
+		return parts[len(parts)-2] + ":" + parts[len(parts)-1]
+	}
+	return id
+}
+
+func count(s string) int64 {
+	n, err := strconv.ParseInt(strings.TrimSpace(s), 10, 64)
+	if err != nil {
+		return -1
+	}
+	return n
+}
+
+func yes(s string) bool { return strings.EqualFold(strings.TrimSpace(s), "yes") }
+
+// nvlinkError matches a line of `nvidia-smi nvlink -e`, whose wording varies
+// by driver: "Link 0: Replay Errors: 0", "Link 0: CRC Errors: 0",
+// "Link 3: Data CRC Errors: 2".
+var (
+	nvlinkGPU   = regexp.MustCompile(`^GPU (\d+):`)
+	nvlinkError = regexp.MustCompile(`Link \d+:\s*(.*?)\s*Errors?\s*:\s*(\d+)`)
+)
+
+// parseNVLinkErrors sums each card's link errors by kind: CRC, replay,
+// recovery.
+func parseNVLinkErrors(out string) map[int][3]int64 {
+	res := map[int][3]int64{}
+	gpu := -1
+	for _, line := range strings.Split(out, "\n") {
+		if m := nvlinkGPU.FindStringSubmatch(strings.TrimSpace(line)); m != nil {
+			gpu, _ = strconv.Atoi(m[1])
+			continue
+		}
+		m := nvlinkError.FindStringSubmatch(line)
+		if m == nil || gpu < 0 {
+			continue
+		}
+		n, _ := strconv.ParseInt(m[2], 10, 64)
+		e := res[gpu]
+		kind := strings.ToLower(m[1])
+		switch {
+		case strings.Contains(kind, "crc"):
+			e[0] += n
+		case strings.Contains(kind, "replay"):
+			e[1] += n
+		case strings.Contains(kind, "recovery"):
+			e[2] += n
+		}
+		res[gpu] = e
+	}
+	return res
+}
+
+type xidEvent struct {
+	bus  string
+	code int
+	text string
+	at   float64
+}
+
+// xidLine matches the driver's report of an XID:
+// "NVRM: Xid (PCI:0000:3b:00): 79, pid=..., GPU has fallen off the bus."
+var xidLine = regexp.MustCompile(`NVRM: Xid \(PCI:([0-9a-fA-F:.]+)\): (\d+),\s*(.*)$`)
+
+// parseXIDs reads journalctl's short-unix lines: a timestamp, then the
+// message.
+func parseXIDs(out string) []xidEvent {
+	var evs []xidEvent
+	for _, line := range strings.Split(out, "\n") {
+		m := xidLine.FindStringSubmatch(line)
+		if m == nil {
+			continue
+		}
+		code, _ := strconv.Atoi(m[2])
+		e := xidEvent{bus: busOf(m[1]), code: code, text: strings.TrimSpace(m[3])}
+		if f := strings.Fields(line); len(f) > 0 {
+			e.at, _ = strconv.ParseFloat(f[0], 64)
+		}
+		evs = append(evs, e)
+	}
+	return evs
+}

internal/agent/discovery/gpuhealth_test.go

@@ -0,0 +1,101 @@
+package discovery
+
+import (
+	"context"
+	"errors"
+	"strings"
+	"testing"
+	"time"
+)
+
+const healthXML = `<?xml version="1.0" ?>
+<nvidia_smi_log>
+  <gpu id="00000000:3B:00.0">
+    <pci><replay_counter>0</replay_counter></pci>
+    <retired_pages>
+      <multiple_single_bit_retirement><retired_count>N/A</retired_count></multiple_single_bit_retirement>
+      <double_bit_retirement><retired_count>N/A</retired_count></double_bit_retirement>
+      <pending_retirement>N/A</pending_retirement>
+    </retired_pages>
+    <remapped_rows>
+      <remapped_row_corr>2</remapped_row_corr>
+      <remapped_row_unc>1</remapped_row_unc>
+      <remapped_row_pending>Yes</remapped_row_pending>
+      <remapped_row_failure>No</remapped_row_failure>
+    </remapped_rows>
+  </gpu>
+  <gpu id="00000000:5E:00.0">
+    <pci><replay_counter>4021</replay_counter></pci>
+    <retired_pages>
+      <multiple_single_bit_retirement><retired_count>3</retired_count></multiple_single_bit_retirement>
+      <double_bit_retirement><retired_count>1</retired_count></double_bit_retirement>
+      <pending_blacklist>Yes</pending_blacklist>
+    </retired_pages>
+    <remapped_rows>N/A</remapped_rows>
+  </gpu>
+</nvidia_smi_log>`
+
+const nvlinkOut = `GPU 0: NVIDIA H100 80GB HBM3 (UUID: GPU-aaa)
+	 Link 0: Replay Errors: 1
+	 Link 0: Recovery Errors: 0
+	 Link 0: CRC Errors: 5
+	 Link 1: Data CRC Errors: 2
+GPU 1: NVIDIA H100 80GB HBM3 (UUID: GPU-bbb)
+	 Link 0: Replay Errors: 0
+`
+
+func TestAGPUsWearAndFailuresAreReadAndCountedFromWhenTheAgentStarted(t *testing.T) {
+	now := time.Unix(1_800_000_000, 0)
+	journal := ""
+	h := &HealthSampler{now: func() time.Time { return now }, xids: map[int]*GPUWear{},
+		run: func(_ context.Context, name string, args ...string) ([]byte, error) {
+			switch {
+			case name == "nvidia-smi" && args[0] == "-q":
+				return []byte(healthXML), nil
+			case name == "nvidia-smi" && args[0] == "nvlink":
+				return []byte(nvlinkOut), nil
+			case name == "journalctl":
+				if journal == "" {
+					return nil, errors.New("exit status 1")
+				}
+				return []byte(journal), nil
+			}
+			return nil, errors.New("unexpected " + name)
+		}}
+	got := h.Sample(t.Context())
+	if len(got) != 2 {
+		t.Fatalf("%+v", got)
+	}
+	a, b := got[0], got[1]
+	if a.RemappedCorrectable != 2 || a.RemappedUncorrectable != 1 || !a.RemapPending || a.RemapFailure ||
+		a.RetiredSBE != -1 || a.PCIeReplays != 0 || a.NVLinkCRC != 7 || a.NVLinkReplay != 1 {
+		t.Errorf("card 0 %+v", a)
+	}
+	if b.PCIeReplays != 4021 || b.RetiredSBE != 3 || b.RetiredDBE != 1 || !b.RetirePending || b.RemappedCorrectable != -1 {
+		t.Errorf("card 1 %+v", b)
+	}
+
+	// An XID on card 1, logged after the agent started; read on the next
+	// sample a minute on.
+	journal = "1800000030.123456 gpu07 kernel: NVRM: Xid (PCI:0000:5e:00): 79, pid=1234, name=llama-server, GPU has fallen off the bus.\n"
+	now = now.Add(61 * time.Second)
+	got = h.Sample(t.Context())
+	if got[1].XIDs != 1 || got[1].LastXID != 79 || !strings.Contains(got[1].LastXIDText, "fallen off the bus") ||
+		got[1].LastXIDAt.Unix() != 1_800_000_030 || got[0].XIDs != 0 {
+		t.Errorf("after an XID: %+v / %+v", got[0], got[1])
+	}
+	// Within the minute, the last reading.
+	journal = ""
+	now = now.Add(10 * time.Second)
+	if again := h.Sample(t.Context()); again[1].XIDs != 1 {
+		t.Errorf("%+v", again[1])
+	}
+}
+
+func TestBusIDsAreReadAsTheKernelWritesThem(t *testing.T) {
+	for in, want := range map[string]string{"00000000:3B:00.0": "3b:00", "0000:3b:00": "3b:00", "0000:5e:00.0": "5e:00"} {
+		if got := busOf(in); got != want {
+			t.Errorf("%s: %s, want %s", in, got, want)
+		}
+	}
+}

internal/agent/discovery/gpuprocs.go

@@ -0,0 +1,142 @@
+package discovery
+
+import (
+	"context"
+	"encoding/xml"
+	"fmt"
+	"os/exec"
+	"slices"
+	"strconv"
+	"strings"
+)
+
+// GPUProcesses reports which processes hold memory on each GPU, by the GPU's
+// nvidia-smi index: what a process actually computes on, as opposed to what it
+// was told to use. A llama.cpp started with --n-gpu-layers on a GPU whose
+// backend did not load runs on the CPU without a word, and this is where that
+// shows — the process is on no GPU's list.
+//
+// From the full query rather than --query-compute-apps, which lists compute
+// processes only: llama.cpp's Vulkan build is listed as a graphics one, and
+// would have read as not on its GPU at all.
+//
+// A node with no nvidia-smi returns nil and no error, as discovery does.
+func GPUProcesses(ctx context.Context, binary string) (map[int][]int, error) {
+	if binary == "" {
+		if _, err := exec.LookPath("nvidia-smi"); err != nil {
+			return nil, nil
+		}
+		binary = "nvidia-smi"
+	}
+	out, err := exec.CommandContext(ctx, binary, "-q", "-x").Output()
+	if err != nil {
+		return nil, fmt.Errorf("running %s: %w", binary, err)
+	}
+	return parseGPUProcesses(out)
+}
+
+// GPUMemory is one device's memory as nvidia-smi reports it at a moment: what
+// is allocated on it, and which processes hold how much of that.
+//
+// A device is what discovery reports: a whole card, or each MIG instance of a
+// card in MIG mode, in the same order, so the readings line up with the
+// inventory one for one.
+type GPUMemory struct {
+	// Index is the device's number as placement knows it: the card's
+	// nvidia-smi index, or MIGIndex's for an instance.
+	Index  int
+	UsedMB int
+	Procs  []GPUProcess
+}
+
+// GPUProcess is one process holding memory on a card.
+type GPUProcess struct {
+	PID    int
+	UsedMB int
+}
+
+// GPUMemoryByProcess reports each GPU's memory, by index, with the processes
+// holding it — from the same report as GPUProcesses, so the two never
+// disagree about who is on a card.
+//
+// A node with no nvidia-smi returns nil and no error, as discovery does.
+func GPUMemoryByProcess(ctx context.Context, binary string) ([]GPUMemory, error) {
+	if binary == "" {
+		if _, err := exec.LookPath("nvidia-smi"); err != nil {
+			return nil, nil
+		}
+		binary = "nvidia-smi"
+	}
+	out, err := exec.CommandContext(ctx, binary, "-q", "-x").Output()
+	if err != nil {
+		return nil, fmt.Errorf("running %s: %w", binary, err)
+	}
+	return parseGPUMemory(out)
+}
+
+// parseGPUProcesses reads the report, by device as placement numbers them:
+// nvidia-smi's index for a whole card, MIGIndex's for a MIG instance.
+func parseGPUProcesses(report []byte) (map[int][]int, error) {
+	mem, err := parseGPUMemory(report)
+	if err != nil {
+		return nil, err
+	}
+	out := map[int][]int{}
+	for _, g := range mem {
+		for _, p := range g.Procs {
+			out[g.Index] = append(out[g.Index], p.PID)
+		}
+	}
+	return out, nil
+}
+
+// parseGPUMemory reads the report into each device's memory and its holders.
+//
+// Cards are listed in index order, which is nvidia-smi's own numbering. A
+// card in MIG mode is read as its instances, each with its own memory and
+// the processes nvidia-smi attributes to its GPU and compute instance: a
+// process on one instance is not on its neighbours, and the card's total
+// would have charged every instance with all of them.
+func parseGPUMemory(report []byte) ([]GPUMemory, error) {
+	var log migLog
+	if err := xml.Unmarshal(report, &log); err != nil {
+		return nil, fmt.Errorf("reading nvidia-smi's report: %w", err)
+	}
+	out := make([]GPUMemory, 0, len(log.GPUs))
+	for i, g := range log.GPUs {
+		procs := func(gi, ci int) []GPUProcess {
+			var ps []GPUProcess
+			for _, p := range g.Processes {
+				pid, err := strconv.Atoi(strings.TrimSpace(p.PID))
+				if err != nil {
+					continue
+				}
+				if gi >= 0 && (atoiOr(p.GPUInstance, -1) != gi || atoiOr(p.ComputeInstance, -1) != ci) {
+					continue
+				}
+				ps = append(ps, GPUProcess{PID: pid, UsedMB: mib(p.UsedMB)})
+			}
+			return ps
+		}
+		if !enabled(g.Current) || len(g.Devices) == 0 {
+			out = append(out, GPUMemory{Index: i, UsedMB: mib(g.Used), Procs: procs(-1, -1)})
+			continue
+		}
+		devs := slices.Clone(g.Devices)
+		slices.SortFunc(devs, func(a, b migLogDevice) int { return atoiOr(a.Index, -1) - atoiOr(b.Index, -1) })
+		for _, d := range devs {
+			out = append(out, GPUMemory{
+				Index:  MIGIndex(i, atoiOr(d.Index, 0)),
+				UsedMB: mib(d.Used),
+				Procs:  procs(atoiOr(d.GPUInstance, -1), atoiOr(d.ComputeInstance, -1)),
+			})
+		}
+	}
+	return out, nil
+}
+
+// mib reads "4932 MiB"; anything else, "N/A" included, is zero.
+func mib(s string) int {
+	n, _ := strconv.Atoi(strings.TrimSpace(strings.TrimSuffix(strings.TrimSpace(s), "MiB")))
+	return n
+}

internal/agent/discovery/gpuprocs_test.go

@@ -0,0 +1,78 @@
+package discovery
+
+import (
+	"reflect"
+	"testing"
+)
+
+func TestGPUProcessesOfEveryKindAreListedByIndex(t *testing.T) {
+	report := `<?xml version="1.0" ?>
+<nvidia_smi_log>
+  <driver_version>580.65.06</driver_version>
+  <gpu id="00000000:17:00.0"><product_name>Tesla V100-SXM2-32GB</product_name>
+    <processes></processes>
+  </gpu>
+  <gpu id="00000000:65:00.0"><product_name>Tesla V100-SXM2-32GB</product_name>
+    <processes>
+      <process_info><pid>4100</pid><type>C</type><process_name>llama-server</process_name></process_info>
+      <process_info><pid>4300</pid><type>G</type><process_name>llama-server</process_name></process_info>
+    </processes>
+  </gpu>
+  <gpu id="00000000:B3:00.0"><processes>
+      <process_info><pid>4200</pid><type>C+G</type></process_info>
+  </processes></gpu>
+</nvidia_smi_log>`
+	got, err := parseGPUProcesses([]byte(report))
+	if err != nil {
+		t.Fatal(err)
+	}
+	// A Vulkan engine is a graphics process ("G") and is on its GPU all the
+	// same; a compute-only query would have missed it.
+	want := map[int][]int{1: {4100, 4300}, 2: {4200}}
+	if !reflect.DeepEqual(got, want) {
+		t.Errorf("got %v, want %v", got, want)
+	}
+	if _, err := parseGPUProcesses([]byte("not xml")); err == nil {
+		t.Error("a report that does not parse was read as no processes")
+	}
+}
+
+func TestGPUMemoryIsReadPerProcess(t *testing.T) {
+	report := `<?xml version="1.0" ?>
+<nvidia_smi_log>
+  <gpu id="00000000:01:00.0"><product_name>Quadro RTX 6000</product_name>
+    <fb_memory_usage><total>24576 MiB</total><used>14514 MiB</used><free>10062 MiB</free></fb_memory_usage>
+    <processes>
+      <process_info><pid>71315</pid><type>C</type><used_memory>4932 MiB</used_memory></process_info>
+      <process_info><pid>4100</pid><type>C</type><used_memory>9500 MiB</used_memory></process_info>
+    </processes>
+  </gpu>
+  <gpu id="00000000:02:00.0">
+    <fb_memory_usage><used>N/A</used></fb_memory_usage>
+    <processes></processes>
+  </gpu>
+</nvidia_smi_log>`
+	got, err := parseGPUMemory([]byte(report))
+	if err != nil {
+		t.Fatal(err)
+	}
+	want := []GPUMemory{
+		{Index: 0, UsedMB: 14514, Procs: []GPUProcess{{PID: 71315, UsedMB: 4932}, {PID: 4100, UsedMB: 9500}}},
+		{Index: 1},
+	}
+	if !reflect.DeepEqual(got, want) {
+		t.Errorf("got %+v, want %+v", got, want)
+	}
+}
+
+func TestForeignMemoryBelowTheToleranceIsNoProblem(t *testing.T) {
+	// A CUDA context that has let go of its model still holds a few hundred
+	// MiB: ComfyUI after /free held 324.
+	if p := ForeignMemoryProblem(330); p != "" {
+		t.Errorf("330 MiB is a problem: %q", p)
+	}
+	p := ForeignMemoryProblem(5014)
+	if !IsForeignMemoryProblem(p) || IsForeignMemoryProblem("2 uncorrected ECC errors") {
+		t.Errorf("%q is not recognised as the foreign memory problem, or ECC is", p)
+	}
+}

internal/agent/discovery/host.go

@@ -3,6 +3,7 @@ package discovery
 import (
 	"bufio"
 	"os"
+	"regexp"
 	"runtime"
 	"strconv"
 	"strings"
@@ -30,6 +31,10 @@ type Host struct {
 	// MinComputeCapability is the oldest GPU's, 0 when there are none or it
 	// is not known. Not read here but from the GPU inventory, by the agent.
 	MinComputeCapability float64 `json:"min_compute_capability,omitempty"`
+	// MemBandwidthGBs is how fast the memory reads, in GB/s, 0 when not
+	// measured: what decides a model's speed on the CPU. Not read here but
+	// measured by the agent when it starts (MeasureMemoryBandwidth).
+	MemBandwidthGBs float64 `json:"mem_bandwidth_gbs,omitempty"`
 }
 
 // Family is the packaging family: "deb", "rpm", or "" when neither is known.
@@ -142,17 +147,29 @@ func cpuFlagsFrom(path string) []string {
 // nvidiaDriverFrom reads the loaded kernel module's version, which exists
 // exactly when a driver is loaded — unlike nvidia-smi, which can be installed
 // on a machine whose module failed to load.
+var driverVersion = regexp.MustCompile(`^[0-9]+\.[0-9]+(\.[0-9]+)?$`)
+
 func nvidiaDriverFrom(path string) string {
 	b, err := os.ReadFile(path) //nolint:gosec // a fixed system path
 	if err != nil {
 		return ""
 	}
-	// "NVRM version: NVIDIA UNIX x86_64 Kernel Module  570.86.15  Thu ..."
+	// "NVRM version: NVIDIA UNIX x86_64 Kernel Module  570.86.15  Thu ...", or
+	// for the open module, the default since 560, "NVIDIA UNIX Open Kernel
+	// Module for x86_64  580.82.07  Release Build ...": the first version
+	// after "Module", not the word after it. Read as "for", the driver was
+	// unknown, and every build was tried whatever driver it needs.
 	fields := strings.Fields(string(b))
 	for i, f := range fields {
-		if f == "Module" && i+1 < len(fields) {
-			return fields[i+1]
+		if f != "Module" {
+			continue
 		}
+		for _, v := range fields[i+1:] {
+			if driverVersion.MatchString(v) {
+				return v
+			}
+		}
+		return ""
 	}
 	return ""
 }

internal/agent/discovery/host_driver_test.go

@@ -0,0 +1,25 @@
+package discovery
+
+import (
+	"os"
+	"path/filepath"
+	"testing"
+)
+
+func TestNVIDIADriverFrom(t *testing.T) {
+	for _, tc := range []struct{ text, want string }{
+		{"NVRM version: NVIDIA UNIX x86_64 Kernel Module  570.86.15  Thu Jan 23 21:30:38 UTC 2025\nGCC version:  gcc version 12.2.0\n", "570.86.15"},
+		{"NVRM version: NVIDIA UNIX Open Kernel Module for x86_64  580.82.07  Release Build  (dvs-builder@U16-I3-B03-4-3)  Wed Aug 27 00:51:12 UTC 2025\n", "580.82.07"},
+		{"NVRM version: NVIDIA UNIX Open Kernel Module for aarch64  580.95.05  Release Build\n", "580.95.05"},
+		{"NVRM version: NVIDIA UNIX x86_64 Kernel Module  535.54  Mon\n", "535.54"},
+		{"something else\n", ""},
+	} {
+		p := filepath.Join(t.TempDir(), "version")
+		if err := os.WriteFile(p, []byte(tc.text), 0o600); err != nil {
+			t.Fatal(err)
+		}
+		if got := nvidiaDriverFrom(p); got != tc.want {
+			t.Errorf("%q: got %q, want %q", tc.text, got, tc.want)
+		}
+	}
+}

internal/agent/discovery/membw.go

@@ -0,0 +1,146 @@
+package discovery
+
+import (
+	"bufio"
+	"os"
+	"path/filepath"
+	"runtime"
+	"strconv"
+	"strings"
+	"sync"
+	"time"
+)
+
+// How fast this machine reads its memory, which on a CPU is what decides how
+// fast a model answers: every token of a reply reads all the weights it uses
+// once, so a node that reads 40 GB/s writes a 4 GB model's tokens about ten
+// times a second, whatever its core count. Measured once when the agent
+// starts, in a fraction of a second, by every CPU summing a share of a buffer
+// too large for any cache — a VM sharing its host's memory with others gets
+// its share, which is the number that matters for it.
+
+// bandwidthBuffer is what is read at most; the least is eight times the
+// processor's last cache, and never under minBuffer. Smaller, it would be
+// the cache that was measured — some hold a gigabyte — and the figure kept
+// would be too high.
+const (
+	bandwidthBuffer = 2 << 30
+	minBuffer       = 256 << 20
+)
+
+// MeasureMemoryBandwidth is the memory's read rate in GB/s, the best of a
+// few passes; 0 when the machine has too little free memory to measure.
+func MeasureMemoryBandwidth() float64 {
+	size := int64(bandwidthBuffer)
+	// Never more than a quarter of what is free: a node already holding
+	// models must not be pushed into swap by a measurement. Without room
+	// for a buffer past the cache, none is measured: the hourly retry
+	// measures it when there is.
+	if avail := memAvailable("/proc/meminfo"); avail > 0 {
+		size = min(size, avail/4)
+	}
+	if size < max(minBuffer, 8*lastCacheBytes("/sys/devices/system/cpu")) {
+		return 0
+	}
+	buf := make([]uint64, size/8)
+	for i := range buf {
+		buf[i] = uint64(i)
+	}
+	workers := runtime.NumCPU()
+	chunk := (len(buf) + workers - 1) / workers
+	best := 0.0
+	for pass := 0; pass < 4; pass++ {
+		var wg sync.WaitGroup
+		start := time.Now()
+		for w := 0; w < workers; w++ {
+			lo, hi := w*chunk, min((w+1)*chunk, len(buf))
+			if lo >= hi {
+				continue
+			}
+			wg.Add(1)
+			go func(part []uint64) {
+				defer wg.Done()
+				sink(sum(part))
+			}(buf[lo:hi])
+		}
+		wg.Wait()
+		if s := time.Since(start).Seconds(); s > 0 {
+			best = max(best, float64(size)/s/1e9)
+		}
+	}
+	return best
+}
+
+// sum reads every word, eight at a time so the loop is not what limits it.
+func sum(p []uint64) uint64 {
+	var a, b, c, d, e, f, g, h uint64
+	i := 0
+	for ; i+8 <= len(p); i += 8 {
+		a += p[i]
+		b += p[i+1]
+		c += p[i+2]
+		d += p[i+3]
+		e += p[i+4]
+		f += p[i+5]
+		g += p[i+6]
+		h += p[i+7]
+	}
+	for ; i < len(p); i++ {
+		a += p[i]
+	}
+	return a + b + c + d + e + f + g + h
+}
+
+// sinkValue keeps the sums alive, so the reads are not optimised away.
+var sinkValue struct {
+	sync.Mutex
+	v uint64
+}
+
+func sink(v uint64) {
+	sinkValue.Lock()
+	sinkValue.v += v
+	sinkValue.Unlock()
+}
+
+// memAvailable is MemAvailable in bytes, 0 when unknown.
+func memAvailable(path string) int64 {
+	f, err := os.Open(path) //nolint:gosec // a fixed system path
+	if err != nil {
+		return 0
+	}
+	defer f.Close()
+	sc := bufio.NewScanner(f)
+	for sc.Scan() {
+		fields := strings.Fields(sc.Text())
+		if len(fields) >= 2 && fields[0] == "MemAvailable:" {
+			kb, _ := strconv.ParseInt(fields[1], 10, 64)
+			return kb << 10
+		}
+	}
+	return 0
+}
+
+// lastCacheBytes is the largest cache any CPU reports, 0 when unknown.
+func lastCacheBytes(root string) int64 {
+	paths, _ := filepath.Glob(filepath.Join(root, "cpu*", "cache", "index*", "size"))
+	var most int64
+	for _, p := range paths {
+		b, err := os.ReadFile(p) //nolint:gosec // under /sys
+		if err != nil {
+			continue
+		}
+		v := strings.TrimSpace(string(b))
+		mult := int64(1)
+		switch {
+		case strings.HasSuffix(v, "K"):
+			mult, v = 1<<10, strings.TrimSuffix(v, "K")
+		case strings.HasSuffix(v, "M"):
+			mult, v = 1<<20, strings.TrimSuffix(v, "M")
+		}
+		if n, err := strconv.ParseInt(v, 10, 64); err == nil {
+			most = max(most, n*mult)
+		}
+	}
+	return most
+}

internal/agent/discovery/membw_test.go

@@ -0,0 +1,32 @@
+package discovery
+
+import (
+	"os"
+	"path/filepath"
+	"testing"
+)
+
+func TestMemoryBandwidthIsMeasured(t *testing.T) {
+	if testing.Short() {
+		t.Skip("reads half a gigabyte")
+	}
+	bw := MeasureMemoryBandwidth()
+	// Any machine running this reads more than a gigabyte a second and less
+	// than a few terabytes.
+	if bw < 1 || bw > 5000 {
+		t.Errorf("measured %.1f GB/s", bw)
+	}
+	t.Logf("%.1f GB/s", bw)
+}
+
+func TestTheLastCacheIsReadFromSys(t *testing.T) {
+	root := t.TempDir()
+	for path, size := range map[string]string{"cpu0/cache/index0/size": "48K", "cpu0/cache/index3/size": "96M"} {
+		p := filepath.Join(root, path)
+		_ = os.MkdirAll(filepath.Dir(p), 0o755)
+		_ = os.WriteFile(p, []byte(size+"\n"), 0o644)
+	}
+	if got := lastCacheBytes(root); got != 96<<20 {
+		t.Errorf("%d", got)
+	}
+}

internal/agent/discovery/mig.go

@@ -0,0 +1,560 @@
+package discovery
+
+// MIG — Multi-Instance GPU — carves one A100, H100 or later card into up to
+// seven instances, each with its own memory, its own share of the
+// multiprocessors and its own UUID. To CUDA an instance is a device of its
+// own, and to placement it is one too: a card in MIG mode is reported as its
+// instances instead of as the whole card, each a GPU of a class named from
+// the card's and the instance's profile ("a100-80g-mig-3g.40gb").
+//
+// llmgw does not create instances. Which split a card gets is an operator's
+// decision, made with nvidia-smi mig; discovery reads what is there.
+//
+// Two facts about MIG shape everything below. A process is given one MIG
+// device: CUDA enumerates a single instance however many are made visible.
+// And instances have no NVLink or peer-to-peer access between them. A replica
+// on MIG therefore runs on exactly one instance, never a tensor-parallel group
+// of them, and the catalog refuses a profile that asks for more.
+
+import (
+	"context"
+	"encoding/xml"
+	"fmt"
+	"math"
+	"os/exec"
+	"regexp"
+	"slices"
+	"strconv"
+	"strings"
+)
+
+// MIGDevice is what a MIG instance carries beyond any GPU's fields: which
+// card it is carved from, and how.
+type MIGDevice struct {
+	// ParentIndex is the card's nvidia-smi index, which is what its sensors,
+	// topology and wear are reported by.
+	ParentIndex int    `json:"parent_index"`
+	ParentUUID  string `json:"parent_uuid,omitempty"`
+	// ParentMemoryTotalMB is the whole card's memory: the class is named from
+	// the card, so an instance of an 80 GB card is not mistaken for one of a
+	// 40 GB card that happens to have the same profile name.
+	ParentMemoryTotalMB int `json:"parent_memory_total_mb"`
+	// Device is the instance's number on its card, as nvidia-smi -L lists it.
+	Device int `json:"device"`
+	// Profile is NVIDIA's name for the slice, like "3g.40gb": three of the
+	// card's seven compute slices and forty gigabytes of its memory.
+	Profile string `json:"profile"`
+	// GPUInstance and ComputeInstance are the instance's ids in nvidia-smi
+	// mig -lgi and -lci, which is how nvidia-smi attributes processes to it.
+	GPUInstance     int `json:"gpu_instance"`
+	ComputeInstance int `json:"compute_instance"`
+}
+
+// migIndexBase starts the numbers MIG instances are given.
+//
+// Placement, the agent protocol and every running shard name a node's devices
+// by an integer, which for a whole card is its nvidia-smi index. An instance
+// has none of its own, so it is given 1000 + 100 × card + device: card 0's
+// instance 2 is 1002, card 3's instance 0 is 1300. Readable, stable while the
+// instances are, and never one a whole card could have.
+const migIndexBase = 1000
+
+// MIGIndex is the device number placement knows a MIG instance by.
+func MIGIndex(card, device int) int { return migIndexBase + 100*card + device }
+
+// IsMIGIndex reports whether a device number names a MIG instance.
+func IsMIGIndex(i int) bool { return i >= migIndexBase }
+
+// DeviceLabel is how a device number is shown to people: "3" for a whole
+// card, "0/mig2" for card 0's MIG instance 2.
+func DeviceLabel(i int) string {
+	if !IsMIGIndex(i) {
+		return strconv.Itoa(i)
+	}
+	i -= migIndexBase
+	return fmt.Sprintf("%d/mig%d", i/100, i%100)
+}
+
+// DeviceLabels is DeviceLabel for each of a list.
+func DeviceLabels(is []int) []string {
+	out := make([]string, len(is))
+	for k, i := range is {
+		out[k] = DeviceLabel(i)
+	}
+	return out
+}
+
+// IsMIG reports whether this GPU is a MIG instance rather than a whole card.
+func (g GPU) IsMIG() bool { return g.MIG != nil }
+
+// CardIndex is the nvidia-smi index of the physical card this GPU is on: its
+// own index for a whole card, its parent's for a MIG instance.
+func (g GPU) CardIndex() int {
+	if g.MIG != nil {
+		return g.MIG.ParentIndex
+	}
+	return g.Index
+}
+
+// migClassMarker joins a card's class to an instance's profile in a MIG
+// class: "a100-80g" + "-mig-" + "3g.40gb".
+const migClassMarker = "-mig-"
+
+// IsMIGClass reports whether a GPU class names MIG instances.
+func IsMIGClass(class string) bool { return strings.Contains(class, migClassMarker) }
+
+// migProfileClean keeps a profile name to what a class may hold: "1g.10gb+me"
+// becomes "1g.10gb-me".
+var migProfileClean = regexp.MustCompile(`[^a-z0-9.]+`)
+
+// migClass is the class of a MIG instance: the card's class and the profile.
+func migClass(parentClass, profile string) string {
+	p := migProfileClean.ReplaceAllString(strings.ToLower(strings.TrimSpace(profile)), "-")
+	return parentClass + migClassMarker + strings.Trim(p, "-")
+}
+
+// MIGProfileMemoryGB reads the memory out of a MIG class or profile:
+// 40 from "a100-80g-mig-3g.40gb" or "3g.40gb". Zero when there is none.
+func MIGProfileMemoryGB(s string) int {
+	if i := strings.LastIndex(s, migClassMarker); i >= 0 {
+		s = s[i+len(migClassMarker):]
+	}
+	m := migProfileMemory.FindStringSubmatch(strings.ToLower(s))
+	if m == nil {
+		return 0
+	}
+	gb, _ := strconv.Atoi(m[1])
+	return gb
+}
+
+var migProfileMemory = regexp.MustCompile(`^\d+g\.(\d+)gb`)
+
+// --- nvidia-smi -L ---
+
+// listedMIG is one MIG instance as nvidia-smi -L lists it.
+type listedMIG struct {
+	Device  int
+	Profile string
+	UUID    string
+}
+
+var (
+	// "GPU 0: NVIDIA A100-SXM4-80GB (UUID: GPU-5d5ba0d6-...)"
+	smiListGPU = regexp.MustCompile(`^GPU (\d+):`)
+	// "  MIG 3g.40gb     Device  0: (UUID: MIG-c6d4f1ef-...)". Drivers before
+	// R470 name the instance MIG-GPU-<card uuid>/<gi>/<ci>, which CUDA of that
+	// era takes in the same place, so the UUID is read as whatever it is.
+	smiListMIG = regexp.MustCompile(`^\s+MIG\s+(\S+)\s+Device\s+(\d+):\s*\(UUID:\s*([^)\s]+)\)`)
+)
+
+// parseSMIList reads nvidia-smi -L into each card's MIG instances, by the
+// card's index, in device order. A card with none is absent.
+func parseSMIList(out string) map[int][]listedMIG {
+	res := map[int][]listedMIG{}
+	card := -1
+	for _, line := range strings.Split(out, "\n") {
+		if m := smiListGPU.FindStringSubmatch(line); m != nil {
+			card, _ = strconv.Atoi(m[1])
+			continue
+		}
+		m := smiListMIG.FindStringSubmatch(line)
+		if m == nil || card < 0 {
+			continue
+		}
+		dev, _ := strconv.Atoi(m[2])
+		res[card] = append(res[card], listedMIG{Device: dev, Profile: m[1], UUID: m[3]})
+	}
+	for c := range res {
+		slices.SortFunc(res[c], func(a, b listedMIG) int { return a.Device - b.Device })
+	}
+	return res
+}
+
+// --- nvidia-smi -q -x ---
+
+// migLog is the part of nvidia-smi's XML report MIG is read from: each card's
+// mode, and each instance's ids and memory.
+type migLog struct {
+	GPUs []migLogGPU `xml:"gpu"`
+}
+
+type migLogGPU struct {
+	ID      string         `xml:"id,attr"`
+	Current string         `xml:"mig_mode>current_mig"`
+	Pending string         `xml:"mig_mode>pending_mig"`
+	Devices []migLogDevice `xml:"mig_devices>mig_device"`
+	// Processes carry the GPU and compute instance they run in on a card
+	// in MIG mode, and "N/A" for both otherwise.
+	Processes []struct {
+		GPUInstance     string `xml:"gpu_instance_id"`
+		ComputeInstance string `xml:"compute_instance_id"`
+		PID             string `xml:"pid"`
+		UsedMB          string `xml:"used_memory"`
+	} `xml:"processes>process_info"`
+	Used string `xml:"fb_memory_usage>used"`
+}
+
+type migLogDevice struct {
+	Index           string `xml:"index"`
+	GPUInstance     string `xml:"gpu_instance_id"`
+	ComputeInstance string `xml:"compute_instance_id"`
+	Total           string `xml:"fb_memory_usage>total"`
+	Used            string `xml:"fb_memory_usage>used"`
+}
+
+// migState is one card's MIG mode and instances from the report.
+type migState struct {
+	BusID          string
+	Enabled        bool
+	PendingEnabled bool
+	Devices        []migReported
+}
+
+// migReported is one instance as the report describes it.
+type migReported struct {
+	Device, GPUInstance, ComputeInstance int
+	TotalMB, UsedMB                      int
+}
+
+// enabled reads nvidia-smi's mode words: "Enabled", "Disabled", "N/A".
+func enabled(s string) bool { return strings.EqualFold(strings.TrimSpace(s), "Enabled") }
+
+func atoiOr(s string, def int) int {
+	n, err := strconv.Atoi(strings.TrimSpace(s))
+	if err != nil {
+		return def
+	}
+	return n
+}
+
+// parseMIGReport reads each card's MIG state from the XML report, in the
+// report's order, which is nvidia-smi's index order.
+func parseMIGReport(report []byte) ([]migState, error) {
+	var log migLog
+	if err := xml.Unmarshal(report, &log); err != nil {
+		return nil, fmt.Errorf("reading nvidia-smi's report: %w", err)
+	}
+	out := make([]migState, len(log.GPUs))
+	for i, g := range log.GPUs {
+		out[i] = migState{BusID: g.ID, Enabled: enabled(g.Current), PendingEnabled: enabled(g.Pending)}
+		for _, d := range g.Devices {
+			out[i].Devices = append(out[i].Devices, migReported{
+				Device: atoiOr(d.Index, -1), GPUInstance: atoiOr(d.GPUInstance, -1),
+				ComputeInstance: atoiOr(d.ComputeInstance, -1),
+				TotalMB:         mib(d.Total), UsedMB: mib(d.Used),
+			})
+		}
+		slices.SortFunc(out[i].Devices, func(a, b migReported) int { return a.Device - b.Device })
+	}
+	return out, nil
+}
+
+// --- putting it together ---
+
+// migProblemNoInstances keeps a card in MIG mode with nothing carved from it
+// out of placement: CUDA cannot use the whole card while MIG is on, and
+// there is no instance to use instead.
+const migProblemNoInstances = "MIG is enabled with no instances created: nothing can run on it " +
+	"until instances are created (nvidia-smi mig -cgi … -C) or MIG is turned off"
+
+// migProblemUnnamed is a card whose instances exist but could not be named:
+// an engine is given an instance by its UUID, and without one it cannot be.
+const migProblemUnnamed = "MIG is enabled and has instances, but nvidia-smi -L did not name them, " +
+	"so none can be given to an engine"
+
+// expandMIG replaces each card in MIG mode with its instances.
+//
+// listed is nvidia-smi -L's instances by card, which names them; report is
+// the XML report's state per card, which gives their memory and ids. Either
+// may be missing: -L alone still says which instances exist, and the report
+// alone still says a card is in MIG mode, so a card it says has instances
+// that -L did not name is kept as the whole card with the reason, rather
+// than placed as a card CUDA will not open.
+func expandMIG(cards []GPU, listed map[int][]listedMIG, report []migState) []GPU {
+	if len(listed) == 0 && !slices.ContainsFunc(report, func(s migState) bool { return s.Enabled }) {
+		return cards
+	}
+	byBus := map[string]migState{}
+	for _, s := range report {
+		byBus[normalizeBusID(s.BusID)] = s
+	}
+	out := make([]GPU, 0, len(cards))
+	for pos, c := range cards {
+		st, ok := byBus[normalizeBusID(c.PCIBusID)]
+		if !ok && pos < len(report) {
+			st = report[pos]
+		}
+		devs := listed[c.Index]
+		if !st.Enabled && len(devs) == 0 {
+			out = append(out, c)
+			continue
+		}
+		if len(devs) == 0 {
+			p := migProblemNoInstances
+			if len(st.Devices) > 0 {
+				p = migProblemUnnamed
+			}
+			c.Health.Problems = append(c.Health.Problems, p)
+			out = append(out, c)
+			continue
+		}
+		for _, d := range devs {
+			var rep migReported
+			found := false
+			for _, r := range st.Devices {
+				if r.Device == d.Device {
+					rep, found = r, true
+				}
+			}
+			mig := migInstance(c, d.Device, d.Profile, d.UUID)
+			if found {
+				mig.MIG.GPUInstance, mig.MIG.ComputeInstance = rep.GPUInstance, rep.ComputeInstance
+				mig.MemoryTotalMB, mig.MemoryUsedMB = rep.TotalMB, rep.UsedMB
+			}
+			if mig.MemoryTotalMB == 0 {
+				// The profile says it to the gigabyte, which is close enough
+				// to place by when the report could not be read.
+				mig.MemoryTotalMB = MIGProfileMemoryGB(d.Profile) * 1024
+			}
+			assessHealth(&mig)
+			out = append(out, mig)
+		}
+	}
+	return out
+}
+
+// migInstance builds a MIG instance of card: everything about the card that
+// is shared — driver, compute capability, NUMA node, bus, temperature and
+// ECC errors — and nothing that is not. Not NVLink, which an instance cannot
+// use; not utilisation, which no driver reports per instance; and not the
+// card's memory or problems, which the instance's own replace.
+func migInstance(card GPU, device int, profile, uuid string) GPU {
+	g := GPU{
+		Index: MIGIndex(card.Index, device), UUID: uuid,
+		Name:              strings.TrimSpace(card.Name + " MIG " + profile),
+		ComputeCapability: card.ComputeCapability, NUMANode: card.NUMANode,
+		PCIBusID: card.PCIBusID, DriverVersion: card.DriverVersion, CUDAVersion: card.CUDAVersion,
+		NICPaths: card.NICPaths, Fabric: card.Fabric,
+		Health: GPUHealth{ECCErrors: card.Health.ECCErrors, TemperatureC: card.Health.TemperatureC},
+		MIG: &MIGDevice{
+			ParentIndex: card.Index, ParentUUID: card.UUID, ParentMemoryTotalMB: card.MemoryTotalMB,
+			Device: device, Profile: profile, GPUInstance: -1, ComputeInstance: -1,
+		},
+	}
+	return g
+}
+
+// readMIG asks nvidia-smi for what expandMIG needs. A failure of either
+// command leaves its half empty, which expandMIG is written to take.
+func readMIG(ctx context.Context, binary string) (map[int][]listedMIG, []migState) {
+	var listed map[int][]listedMIG
+	if out, err := exec.CommandContext(ctx, binary, "-L").Output(); err == nil {
+		listed = parseSMIList(string(out))
+	}
+	var report []migState
+	if out, err := exec.CommandContext(ctx, binary, "-q", "-x").Output(); err == nil {
+		report, _ = parseMIGReport(out)
+	}
+	return listed, report
+}
+
+// --- NVML ---
+
+// nvmlMIGCard is the part of an NVML device MIG discovery reads, behind an
+// interface so the logic is tested without a driver: gpu_nvml.go adapts
+// nvml.Device to it.
+type nvmlMIGCard interface {
+	// MIGMode is nvmlDeviceGetMigMode; ok is false on a card without MIG.
+	MIGMode() (current, pending, ok bool)
+	// MaxMIGDevices is nvmlDeviceGetMaxMigDeviceCount.
+	MaxMIGDevices() int
+	// MIGDevice is nvmlDeviceGetMigDeviceHandleByIndex; ok is false for an
+	// index with no instance behind it, which is how NVML says so.
+	MIGDevice(i int) (nvmlMIGInstance, bool)
+}
+
+// nvmlMIGInstance is one MIG device handle.
+type nvmlMIGInstance interface {
+	UUID() string
+	// Name is "NVIDIA A100-SXM4-80GB MIG 3g.40gb" on the drivers that name
+	// MIG devices, which is where the profile is read from.
+	Name() string
+	Memory() (totalMB, usedMB int, ok bool)
+	Instances() (gpuInstance, computeInstance int)
+	// Slices and MemoryMB are the instance's attributes, which name the
+	// profile on a driver whose device name does not.
+	Attributes() (slices, memoryMB int, ok bool)
+}
+
+var nvmlMIGName = regexp.MustCompile(`MIG\s+(\S+)\s*$`)
+
+// migFromNVML is what one card is to placement under NVML: its instances if
+// it is in MIG mode, itself if it is not. isMIG says which.
+func migFromNVML(card GPU, dev nvmlMIGCard) (out []GPU, isMIG bool) {
+	current, _, ok := dev.MIGMode()
+	if !ok || !current {
+		return []GPU{card}, false
+	}
+	n := dev.MaxMIGDevices()
+	for i := range n {
+		h, ok := dev.MIGDevice(i)
+		if !ok {
+			continue
+		}
+		profile := ""
+		if m := nvmlMIGName.FindStringSubmatch(h.Name()); m != nil {
+			profile = m[1]
+		} else if n, mem, ok := h.Attributes(); ok {
+			// The convention NVIDIA's names follow: compute slices, then the
+			// memory in whole gigabytes.
+			profile = fmt.Sprintf("%dg.%dgb", n, int(math.Round(float64(mem)/1024)))
+		}
+		g := migInstance(card, i, profile, h.UUID())
+		g.MIG.GPUInstance, g.MIG.ComputeInstance = h.Instances()
+		if total, used, ok := h.Memory(); ok {
+			g.MemoryTotalMB, g.MemoryUsedMB = total, used
+		} else {
+			g.MemoryTotalMB = MIGProfileMemoryGB(profile) * 1024
+		}
+		assessHealth(&g)
+		out = append(out, g)
+	}
+	if len(out) == 0 {
+		card.Health.Problems = append(card.Health.Problems, migProblemNoInstances)
+		return []GPU{card}, true
+	}
+	return out, true
+}
+
+// --- what the doctor reports ---
+
+// MIGCard is one card's MIG state, as `llmgw doctor` reports it.
+type MIGCard struct {
+	Index int    `json:"index"`
+	Name  string `json:"name,omitempty"`
+	// Enabled is the mode in force; PendingEnabled the mode after the next
+	// reset of the card, which differs from it until the card is reset.
+	Enabled        bool `json:"enabled"`
+	PendingEnabled bool `json:"pending_enabled"`
+	// Instances are the MIG devices an engine can be given, as nvidia-smi -L
+	// lists them.
+	Instances []MIGListed `json:"instances,omitempty"`
+	// GPUInstances and ComputeInstances are nvidia-smi mig -lgi and -lci: a
+	// GPU instance with no compute instance in it is not a device yet.
+	GPUInstances     []MIGInstance `json:"gpu_instances,omitempty"`
+	ComputeInstances []MIGInstance `json:"compute_instances,omitempty"`
+}
+
+// MIGListed is one instance an engine can be given.
+type MIGListed struct {
+	Device  int    `json:"device"`
+	Profile string `json:"profile"`
+	UUID    string `json:"uuid"`
+}
+
+// MIGInstance is one row of nvidia-smi mig -lgi or -lci.
+type MIGInstance struct {
+	GPU     int    `json:"gpu"`
+	Profile string `json:"profile"`
+	// ProfileID is NVIDIA's number for the profile.
+	ProfileID int `json:"profile_id"`
+	// GPUInstance is the GPU instance's id; ComputeInstance the compute
+	// instance's within it, -1 in a -lgi row.
+	GPUInstance     int    `json:"gpu_instance"`
+	ComputeInstance int    `json:"compute_instance"`
+	Placement       string `json:"placement,omitempty"`
+}
+
+var (
+	// -lgi: "|   0  MIG 3g.40gb          9        2          4:4     |"
+	migLGIRow = regexp.MustCompile(`^\|\s*(\d+)\s+MIG\s+(\S+)\s+(\d+)\s+(\d+)\s+(\d+:\d+)\s*\|`)
+	// -lci: "|   0      1       MIG 3g.40gb          2         0          0:3     |"
+	migLCIRow = regexp.MustCompile(`^\|\s*(\d+)\s+(\d+)\s+MIG\s+(\S+)\s+(\d+)\s+(\d+)\s+(\d+:\d+)\s*\|`)
+)
+
+// ParseMIGInstances reads nvidia-smi mig -lgi or -lci, whichever it is
+// given: the two tables differ by the GPU instance column -lci adds. "No GPU
+// instances found" and the like are no rows, not an error.
+func ParseMIGInstances(out string) []MIGInstance {
+	var res []MIGInstance
+	for _, line := range strings.Split(out, "\n") {
+		line = strings.TrimSpace(line)
+		if m := migLCIRow.FindStringSubmatch(line); m != nil {
+			res = append(res, MIGInstance{
+				GPU: atoiOr(m[1], -1), GPUInstance: atoiOr(m[2], -1), Profile: m[3],
+				ProfileID: atoiOr(m[4], -1), ComputeInstance: atoiOr(m[5], -1), Placement: m[6],
+			})
+			continue
+		}
+		if m := migLGIRow.FindStringSubmatch(line); m != nil {
+			res = append(res, MIGInstance{
+				GPU: atoiOr(m[1], -1), Profile: m[2], ProfileID: atoiOr(m[3], -1),
+				GPUInstance: atoiOr(m[4], -1), ComputeInstance: -1, Placement: m[5],
+			})
+		}
+	}
+	return res
+}
+
+// DiscoverMIG reads every card's MIG state for the doctor: the mode from the
+// XML report, the devices from -L, the instances from nvidia-smi mig. Only
+// cards that support MIG are listed, and an error is returned only when the
+// report itself cannot be read.
+func DiscoverMIG(ctx context.Context, binary string) ([]MIGCard, error) {
+	out, err := exec.CommandContext(ctx, binary, "-q", "-x").Output()
+	if err != nil {
+		return nil, fmt.Errorf("running %s -q -x: %w", binary, err)
+	}
+	var list, lgi, lci string
+	if b, err := exec.CommandContext(ctx, binary, "-L").Output(); err == nil {
+		list = string(b)
+	}
+	// nvidia-smi mig exits non-zero when there is nothing to list, with the
+	// table or the reason on its output either way.
+	b, _ := exec.CommandContext(ctx, binary, "mig", "-lgi").CombinedOutput()
+	lgi = string(b)
+	b, _ = exec.CommandContext(ctx, binary, "mig", "-lci").CombinedOutput()
+	lci = string(b)
+	return buildMIGCards(out, list, lgi, lci)
+}
+
+// buildMIGCards is DiscoverMIG from the commands' output.
+func buildMIGCards(report []byte, list, lgi, lci string) ([]MIGCard, error) {
+	var log struct {
+		GPUs []struct {
+			Name    string `xml:"product_name"`
+			Current string `xml:"mig_mode>current_mig"`
+			Pending string `xml:"mig_mode>pending_mig"`
+		} `xml:"gpu"`
+	}
+	if err := xml.Unmarshal(report, &log); err != nil {
+		return nil, fmt.Errorf("reading nvidia-smi's report: %w", err)
+	}
+	listed := parseSMIList(list)
+	gis, cis := ParseMIGInstances(lgi), ParseMIGInstances(lci)
+	var out []MIGCard
+	for i, g := range log.GPUs {
+		cur, pend := strings.TrimSpace(g.Current), strings.TrimSpace(g.Pending)
+		// A card without MIG says N/A, or nothing on a driver that predates
+		// it; neither is worth a line.
+		if !enabled(cur) && !enabled(pend) && !strings.EqualFold(cur, "Disabled") {
+			continue
+		}
+		c := MIGCard{Index: i, Name: strings.TrimSpace(g.Name), Enabled: enabled(cur), PendingEnabled: enabled(pend)}
+		for _, l := range listed[i] {
+			c.Instances = append(c.Instances, MIGListed(l))
+		}
+		for _, gi := range gis {
+			if gi.GPU == i && gi.ComputeInstance < 0 {
+				c.GPUInstances = append(c.GPUInstances, gi)
+			}
+		}
+		for _, ci := range cis {
+			if ci.GPU == i && ci.ComputeInstance >= 0 {
+				c.ComputeInstances = append(c.ComputeInstances, ci)
+			}
+		}
+		out = append(out, c)
+	}
+	return out, nil
+}

internal/agent/discovery/mig_test.go

@@ -0,0 +1,418 @@
+package discovery
+
+import (
+	"encoding/json"
+	"os"
+	"path/filepath"
+	"reflect"
+	"slices"
+	"strings"
+	"testing"
+)
+
+// Two A100 80GB cards: card 0 in MIG mode, cut into two 3g.40gb instances,
+// card 1 whole. What nvidia-smi prints for that machine, by command. None of
+// it is from real MIG hardware, which this was written without; the shapes
+// follow NVIDIA's documentation and the output of drivers R470 to R550.
+const (
+	migQuery = `0, GPU-5d5ba0d6-d33d-2b2c-524d-9e3d8d2b8a77, NVIDIA A100-SXM4-80GB, 81920, 0, 8.0, 00000000:07:00.0, 550.54.15, 31, 0, [N/A]
+1, GPU-1f2e3d4c-5b6a-7980-a1b2-c3d4e5f60718, NVIDIA A100-SXM4-80GB, 81920, 0, 8.0, 00000000:0F:00.0, 550.54.15, 33, 0, 0
+`
+	migList = `GPU 0: NVIDIA A100-SXM4-80GB (UUID: GPU-5d5ba0d6-d33d-2b2c-524d-9e3d8d2b8a77)
+  MIG 3g.40gb     Device  0: (UUID: MIG-c6d4f1ef-42e4-5de3-91c7-45d71c87eb3f)
+  MIG 3g.40gb     Device  1: (UUID: MIG-0f7c3a2e-9d1b-5a8e-b3c4-1e2f3a4b5c6d)
+GPU 1: NVIDIA A100-SXM4-80GB (UUID: GPU-1f2e3d4c-5b6a-7980-a1b2-c3d4e5f60718)
+`
+	migReport = `<?xml version="1.0" ?>
+<nvidia_smi_log>
+  <driver_version>550.54.15</driver_version>
+  <gpu id="00000000:07:00.0">
+    <product_name>NVIDIA A100-SXM4-80GB</product_name>
+    <mig_mode><current_mig>Enabled</current_mig><pending_mig>Enabled</pending_mig></mig_mode>
+    <mig_devices>
+      <mig_device>
+        <index>1</index>
+        <gpu_instance_id>1</gpu_instance_id>
+        <compute_instance_id>0</compute_instance_id>
+        <device_attributes><shared><multiprocessor_count>42</multiprocessor_count></shared></device_attributes>
+        <fb_memory_usage><total>40192 MiB</total><reserved>0 MiB</reserved><used>21000 MiB</used><free>19192 MiB</free></fb_memory_usage>
+      </mig_device>
+      <mig_device>
+        <index>0</index>
+        <gpu_instance_id>2</gpu_instance_id>
+        <compute_instance_id>0</compute_instance_id>
+        <fb_memory_usage><total>40192 MiB</total><reserved>0 MiB</reserved><used>37 MiB</used><free>40155 MiB</free></fb_memory_usage>
+      </mig_device>
+    </mig_devices>
+    <fb_memory_usage><total>81920 MiB</total><used>21037 MiB</used></fb_memory_usage>
+    <processes>
+      <process_info>
+        <gpu_instance_id>1</gpu_instance_id>
+        <compute_instance_id>0</compute_instance_id>
+        <pid>4100</pid><type>C</type><process_name>vllm</process_name>
+        <used_memory>20900 MiB</used_memory>
+      </process_info>
+    </processes>
+  </gpu>
+  <gpu id="00000000:0F:00.0">
+    <product_name>NVIDIA A100-SXM4-80GB</product_name>
+    <mig_mode><current_mig>Disabled</current_mig><pending_mig>Disabled</pending_mig></mig_mode>
+    <mig_devices>None</mig_devices>
+    <fb_memory_usage><total>81920 MiB</total><used>300 MiB</used></fb_memory_usage>
+    <processes>
+      <process_info>
+        <gpu_instance_id>N/A</gpu_instance_id>
+        <compute_instance_id>N/A</compute_instance_id>
+        <pid>5200</pid><type>C</type><used_memory>250 MiB</used_memory>
+      </process_info>
+    </processes>
+  </gpu>
+</nvidia_smi_log>`
+	migLGI = `+-------------------------------------------------------+
+| GPU instances:                                        |
+| GPU   Name             Profile  Instance   Placement  |
+|                          ID       ID       Start:Size |
+|=======================================================|
+|   0  MIG 3g.40gb          9        1          4:4     |
++-------------------------------------------------------+
+|   0  MIG 3g.40gb          9        2          0:4     |
++-------------------------------------------------------+
+`
+	migLCI = `+--------------------------------------------------------------------+
+| Compute instances:                                                 |
+| GPU     GPU       Name             Profile   Instance   Placement  |
+|       Instance                       ID        ID       Start:Size |
+|         ID                                                         |
+|====================================================================|
+|   0      1       MIG 3g.40gb          2         0          0:3     |
++--------------------------------------------------------------------+
+|   0      2       MIG 3g.40gb          2         0          0:3     |
++--------------------------------------------------------------------+
+`
+)
+
+func migMachine(t *testing.T) []GPU {
+	t.Helper()
+	cards, err := parseSMI(migQuery)
+	if err != nil {
+		t.Fatal(err)
+	}
+	report, err := parseMIGReport([]byte(migReport))
+	if err != nil {
+		t.Fatal(err)
+	}
+	return expandMIG(cards, parseSMIList(migList), report)
+}
+
+func TestACardInMIGModeIsReportedAsItsInstancesInsteadOfItself(t *testing.T) {
+	gpus := migMachine(t)
+	var got []string
+	for _, g := range gpus {
+		got = append(got, DeviceLabel(g.Index)+" "+g.Class())
+	}
+	want := []string{"0/mig0 a100-80g-mig-3g.40gb", "0/mig1 a100-80g-mig-3g.40gb", "1 a100-80g"}
+	if !slices.Equal(got, want) {
+		t.Fatalf("devices = %q, want %q", got, want)
+	}
+
+	mig := gpus[1]
+	if mig.Index != 1001 || mig.UUID != "MIG-0f7c3a2e-9d1b-5a8e-b3c4-1e2f3a4b5c6d" {
+		t.Errorf("instance 1 is %d %s; an engine is given it by that UUID", mig.Index, mig.UUID)
+	}
+	if mig.MemoryTotalMB != 40192 || mig.MemoryUsedMB != 21000 {
+		t.Errorf("instance 1 memory %d/%d, want its own 21000/40192 rather than the card's",
+			mig.MemoryUsedMB, mig.MemoryTotalMB)
+	}
+	if m := mig.MIG; m == nil || m.ParentIndex != 0 || m.Device != 1 || m.Profile != "3g.40gb" ||
+		m.GPUInstance != 1 || m.ComputeInstance != 0 || m.ParentUUID != "GPU-5d5ba0d6-d33d-2b2c-524d-9e3d8d2b8a77" {
+		t.Errorf("instance 1's parentage: %+v", mig.MIG)
+	}
+	if mig.ComputeCapability != "8.0" || mig.DriverVersion != "550.54.15" || mig.Health.TemperatureC != 31 {
+		t.Errorf("what the card and its instances share was not carried: %+v", mig)
+	}
+	// Twenty gigabytes in use on an instance is a foreign tenant there, and
+	// only there: instance 0 next to it is free.
+	if mig.Health.OK() || !gpus[0].Health.OK() {
+		t.Errorf("foreign memory judged per instance: 0 %v, 1 %v", gpus[0].Health.Problems, mig.Health.Problems)
+	}
+	// No driver reports utilisation per instance, and none is made up.
+	if mig.UtilizationPercent != 0 {
+		t.Errorf("an instance reported utilisation %d", mig.UtilizationPercent)
+	}
+	if gpus[2].IsMIG() || gpus[2].Index != 1 || gpus[2].CardIndex() != 1 || gpus[0].CardIndex() != 0 {
+		t.Errorf("the whole card beside it changed: %+v", gpus[2])
+	}
+}
+
+func TestAMIGInstanceSurvivesTheTripToTheControlPlaneWithItsClass(t *testing.T) {
+	g := migMachine(t)[0]
+	b, err := json.Marshal(g)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if !strings.Contains(string(b), `"class":"a100-80g-mig-3g.40gb"`) {
+		t.Errorf("the JSON carries no class for the instance: %s", b)
+	}
+	var back GPU
+	if err := json.Unmarshal(b, &back); err != nil {
+		t.Fatal(err)
+	}
+	if back.Class() != g.Class() || !reflect.DeepEqual(back.MIG, g.MIG) {
+		t.Errorf("came back as %s %+v", back.Class(), back.MIG)
+	}
+}
+
+func TestMIGClassesAreNamedFromTheCardAndTheProfile(t *testing.T) {
+	for _, c := range []struct {
+		name    string
+		cardMB  int
+		profile string
+		want    string
+	}{
+		{"NVIDIA A100-SXM4-80GB MIG 3g.40gb", 81920, "3g.40gb", "a100-80g-mig-3g.40gb"},
+		// The same profile name on a 40 GB card is another class: its
+		// instance is the same size, but the card is not, and neither is
+		// the set of profiles that card can be cut to.
+		{"NVIDIA A100-SXM4-40GB MIG 3g.20gb", 40960, "3g.20gb", "a100-40g-mig-3g.20gb"},
+		{"NVIDIA H100 80GB HBM3 MIG 1g.10gb+me", 81559, "1g.10gb+me", "h100-80g-mig-1g.10gb-me"},
+		{"NVIDIA H100 80GB HBM3 MIG 7g.80gb", 81559, "7g.80gb", "h100-80g-mig-7g.80gb"},
+	} {
+		g := GPU{Name: c.name, MemoryTotalMB: 10000, MIG: &MIGDevice{ParentMemoryTotalMB: c.cardMB, Profile: c.profile}}
+		if got := g.Class(); got != c.want {
+			t.Errorf("%s -> %s, want %s", c.name, got, c.want)
+		}
+		if !IsMIGClass(g.Class()) {
+			t.Errorf("%s is not recognised as a MIG class", g.Class())
+		}
+	}
+	if IsMIGClass("a100-80g") || IsMIGClass("6000-24g") {
+		t.Error("a whole card's class was taken for a MIG one")
+	}
+	if MIGProfileMemoryGB("a100-80g-mig-3g.40gb") != 40 || MIGProfileMemoryGB("1g.10gb+me") != 10 || MIGProfileMemoryGB("a100-80g") != 0 {
+		t.Error("the instance's memory is misread from its profile")
+	}
+}
+
+func TestDeviceNumbersAreShownAsCardAndInstance(t *testing.T) {
+	for i, want := range map[int]string{0: "0", 7: "7", MIGIndex(0, 2): "0/mig2", MIGIndex(3, 0): "3/mig0", 1302: "3/mig2"} {
+		if got := DeviceLabel(i); got != want {
+			t.Errorf("DeviceLabel(%d) = %s, want %s", i, got, want)
+		}
+	}
+	if IsMIGIndex(15) || !IsMIGIndex(MIGIndex(0, 0)) {
+		t.Error("whole cards and instances are told apart wrongly")
+	}
+}
+
+func TestACardInMIGModeWithNoInstancesIsKeptOutOfPlacement(t *testing.T) {
+	cards, _ := parseSMI(migQuery)
+	report, _ := parseMIGReport([]byte(strings.Replace(migReport,
+		migReport[strings.Index(migReport, "<mig_devices>"):strings.Index(migReport, "</mig_devices>")+len("</mig_devices>")],
+		"<mig_devices>None</mig_devices>", 1)))
+	gpus := expandMIG(cards, parseSMIList("GPU 0: NVIDIA A100-SXM4-80GB (UUID: GPU-x)\nGPU 1: NVIDIA A100-SXM4-80GB (UUID: GPU-y)\n"), report)
+	if len(gpus) != 2 || gpus[0].IsMIG() {
+		t.Fatalf("got %+v", gpus)
+	}
+	// CUDA will not open the whole card while MIG is on, and there is no
+	// instance to open instead: placing anything here fails at start.
+	if gpus[0].Health.OK() || !strings.Contains(gpus[0].Health.Problems[0], "no instances") {
+		t.Errorf("card 0's problems: %v", gpus[0].Health.Problems)
+	}
+	if !gpus[1].Health.OK() {
+		t.Errorf("card 1, not in MIG mode, was flagged: %v", gpus[1].Health.Problems)
+	}
+
+	// Instances the report sees but -L could not name cannot be given to an
+	// engine either; the card says why.
+	report, _ = parseMIGReport([]byte(migReport))
+	gpus = expandMIG(cards, nil, report)
+	if len(gpus) != 2 || gpus[0].Health.OK() || !strings.Contains(gpus[0].Health.Problems[0], "did not name") {
+		t.Errorf("with -L failing: %+v", gpus)
+	}
+}
+
+func TestInstancesAreFoundFromTheListAloneWhenTheReportCannotBeRead(t *testing.T) {
+	cards, _ := parseSMI(migQuery)
+	gpus := expandMIG(cards, parseSMIList(migList), nil)
+	if len(gpus) != 3 || !gpus[0].IsMIG() || gpus[0].MemoryTotalMB != 40*1024 {
+		t.Errorf("without the report: %+v", gpus)
+	}
+}
+
+func TestAnOlderDriversInstanceUUIDIsTakenAsItIs(t *testing.T) {
+	// R450 and R460 name an instance by its card and ids, and CUDA of that
+	// era takes exactly that in CUDA_VISIBLE_DEVICES.
+	l := parseSMIList("GPU 0: A100-SXM4-40GB (UUID: GPU-5d5ba0d6-d33d-2b2c-524d-9e3d8d2b8a77)\n" +
+		"  MIG 1g.5gb Device 0: (UUID: MIG-GPU-5d5ba0d6-d33d-2b2c-524d-9e3d8d2b8a77/7/0)\n")
+	if len(l[0]) != 1 || l[0][0].UUID != "MIG-GPU-5d5ba0d6-d33d-2b2c-524d-9e3d8d2b8a77/7/0" || l[0][0].Profile != "1g.5gb" {
+		t.Errorf("parsed %+v", l)
+	}
+}
+
+func TestProcessesOnAMIGCardAreChargedToTheirOwnInstance(t *testing.T) {
+	mem, err := parseGPUMemory([]byte(migReport))
+	if err != nil {
+		t.Fatal(err)
+	}
+	want := []GPUMemory{
+		{Index: 1000, UsedMB: 37},
+		{Index: 1001, UsedMB: 21000, Procs: []GPUProcess{{PID: 4100, UsedMB: 20900}}},
+		{Index: 1, UsedMB: 300, Procs: []GPUProcess{{PID: 5200, UsedMB: 250}}},
+	}
+	if !reflect.DeepEqual(mem, want) {
+		t.Errorf("got %+v\nwant %+v", mem, want)
+	}
+	// In the order discovery reports the devices, so a heartbeat's readings
+	// line up with the inventory one for one.
+	gpus := migMachine(t)
+	for i := range gpus {
+		if mem[i].Index != gpus[i].Index {
+			t.Errorf("reading %d is for device %d, inventory has %d", i, mem[i].Index, gpus[i].Index)
+		}
+	}
+	procs, _ := parseGPUProcesses([]byte(migReport))
+	if !reflect.DeepEqual(procs, map[int][]int{1001: {4100}, 1: {5200}}) {
+		t.Errorf("processes by device: %v", procs)
+	}
+}
+
+func TestAMIGInstanceTakesItsCardsPlaceInTheTopologyButNoNVLink(t *testing.T) {
+	gpus := migMachine(t)
+	topo := Topology{
+		NVLink:  map[int]map[int]int{0: {1: 12}, 1: {0: 12}},
+		NUMA:    map[int]int{0: 0, 1: 1},
+		NICPath: map[int]map[string]string{0: {"mlx5_0": "PIX"}},
+	}
+	topo.Apply(gpus)
+	if len(gpus[0].NVLinkPeers) != 0 || len(gpus[1].NVLinkPeers) != 0 {
+		t.Errorf("MIG instances were given NVLink peers: %v %v", gpus[0].NVLinkPeers, gpus[1].NVLinkPeers)
+	}
+	if gpus[1].NUMANode != 0 || gpus[1].NICPaths["mlx5_0"] != "PIX" {
+		t.Errorf("instance 1 did not take its card's NUMA node and adapters: %+v", gpus[1])
+	}
+	if gpus[2].NUMANode != 1 || !slices.Equal(gpus[2].NVLinkPeers, []int{0}) {
+		t.Errorf("the whole card's topology: %+v", gpus[2])
+	}
+}
+
+func TestMIGInstancesAreDiscoveredThroughNvidiaSMI(t *testing.T) {
+	// The real code path against a stub binary that answers each command as
+	// the machine above would.
+	dir := t.TempDir()
+	stub := filepath.Join(dir, "nvidia-smi")
+	script := "#!/bin/sh\ncase \"$1\" in\n" +
+		"-L) cat <<'EOF'\n" + migList + "EOF\n;;\n" +
+		"-q) cat <<'EOF'\n" + migReport + "\nEOF\n;;\n" +
+		"*) cat <<'EOF'\n" + migQuery + "EOF\n;;\nesac\n"
+	if err := os.WriteFile(stub, []byte(script), 0o755); err != nil {
+		t.Fatal(err)
+	}
+	gpus, err := DiscoverGPUsSMI(t.Context(), stub)
+	if err != nil {
+		t.Fatal(err)
+	}
+	inv := Inventory{GPUs: gpus}
+	if !slices.Equal(inv.Classes(), []string{"a100-80g", "a100-80g-mig-3g.40gb"}) || len(gpus) != 3 {
+		t.Errorf("classes %v from %d devices", inv.Classes(), len(gpus))
+	}
+}
+
+// fakeMIGCard is NVML's view of one card, as nvmlDeviceGetMigMode,
+// nvmlDeviceGetMaxMigDeviceCount and nvmlDeviceGetMigDeviceHandleByIndex
+// would give it.
+type fakeMIGCard struct {
+	mode, pending, supported bool
+	max                      int
+	devs                     map[int]fakeMIGInstance
+}
+
+func (c fakeMIGCard) MIGMode() (bool, bool, bool) { return c.mode, c.pending, c.supported }
+func (c fakeMIGCard) MaxMIGDevices() int          { return c.max }
+func (c fakeMIGCard) MIGDevice(i int) (nvmlMIGInstance, bool) {
+	d, ok := c.devs[i]
+	return d, ok
+}
+
+type fakeMIGInstance struct {
+	uuid, name      string
+	total, used     int
+	gi, ci          int
+	slices, attrMem int
+}
+
+func (m fakeMIGInstance) UUID() string { return m.uuid }
+func (m fakeMIGInstance) Name() string { return m.name }
+func (m fakeMIGInstance) Memory() (int, int, bool) {
+	return m.total, m.used, m.total > 0
+}
+func (m fakeMIGInstance) Instances() (int, int) { return m.gi, m.ci }
+func (m fakeMIGInstance) Attributes() (int, int, bool) {
+	return m.slices, m.attrMem, m.slices > 0
+}
+
+func TestNVMLReportsACardInMIGModeAsItsInstances(t *testing.T) {
+	card := GPU{Index: 2, UUID: "GPU-card", Name: "NVIDIA H100 80GB HBM3", MemoryTotalMB: 81559,
+		ComputeCapability: "9.0", NUMANode: 1, Health: GPUHealth{TemperatureC: 40}}
+	// Seven slots, three filled, one of them on a driver that does not put
+	// the profile in the device's name.
+	dev := fakeMIGCard{mode: true, pending: true, supported: true, max: 7, devs: map[int]fakeMIGInstance{
+		0: {uuid: "MIG-aaa", name: "NVIDIA H100 80GB HBM3 MIG 3g.40gb", total: 40448, used: 10, gi: 2, ci: 0},
+		1: {uuid: "MIG-bbb", name: "NVIDIA H100 80GB HBM3 MIG 3g.40gb", total: 40448, used: 10, gi: 1, ci: 0},
+		4: {uuid: "MIG-ccc", name: "NVIDIA H100 80GB HBM3", total: 9984, gi: 9, ci: 0, slices: 1, attrMem: 9984},
+	}}
+	gpus, isMIG := migFromNVML(card, dev)
+	if !isMIG || len(gpus) != 3 {
+		t.Fatalf("got %d devices, MIG %v", len(gpus), isMIG)
+	}
+	var classes []string
+	for _, g := range gpus {
+		classes = append(classes, DeviceLabel(g.Index)+" "+g.UUID+" "+g.Class())
+	}
+	want := []string{"2/mig0 MIG-aaa h100-80g-mig-3g.40gb", "2/mig1 MIG-bbb h100-80g-mig-3g.40gb",
+		"2/mig4 MIG-ccc h100-80g-mig-1g.10gb"}
+	if !slices.Equal(classes, want) {
+		t.Errorf("devices %q, want %q", classes, want)
+	}
+	if g := gpus[1]; g.MemoryTotalMB != 40448 || g.MIG.GPUInstance != 1 || g.NUMANode != 1 ||
+		g.Health.TemperatureC != 40 || len(g.NVLinkPeers) != 0 {
+		t.Errorf("instance 1: %+v", g)
+	}
+
+	// MIG on and nothing carved: the card, kept out of placement.
+	gpus, isMIG = migFromNVML(card, fakeMIGCard{mode: true, supported: true, max: 7})
+	if !isMIG || len(gpus) != 1 || gpus[0].IsMIG() || gpus[0].Health.OK() {
+		t.Errorf("an empty MIG card: %+v", gpus)
+	}
+	// MIG off, or a card without it: the card, as it always was.
+	for _, d := range []fakeMIGCard{{supported: true, max: 7}, {}} {
+		gpus, isMIG = migFromNVML(card, d)
+		if isMIG || len(gpus) != 1 || !reflect.DeepEqual(gpus[0], card) {
+			t.Errorf("a card not in MIG mode came back as %+v", gpus)
+		}
+	}
+}
+
+func TestMIGInstanceTablesAreRead(t *testing.T) {
+	gis := ParseMIGInstances(migLGI)
+	if len(gis) != 2 || gis[0] != (MIGInstance{GPU: 0, Profile: "3g.40gb", ProfileID: 9, GPUInstance: 1,
+		ComputeInstance: -1, Placement: "4:4"}) {
+		t.Errorf("-lgi: %+v", gis)
+	}
+	cis := ParseMIGInstances(migLCI)
+	if len(cis) != 2 || cis[1] != (MIGInstance{GPU: 0, GPUInstance: 2, Profile: "3g.40gb", ProfileID: 2,
+		ComputeInstance: 0, Placement: "0:3"}) {
+		t.Errorf("-lci: %+v", cis)
+	}
+	if got := ParseMIGInstances("No GPU instances found: Not Found\n"); len(got) != 0 {
+		t.Errorf("nothing to list read as %+v", got)
+	}
+
+	cards, err := buildMIGCards([]byte(migReport), migList, migLGI, migLCI)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(cards) != 2 || !cards[0].Enabled || len(cards[0].Instances) != 2 || len(cards[0].GPUInstances) != 2 ||
+		len(cards[0].ComputeInstances) != 2 || cards[1].Enabled {
+		t.Errorf("cards: %+v", cards)
+	}
+}

internal/agent/discovery/pcie.go

@@ -0,0 +1,181 @@
+package discovery
+
+import (
+	"context"
+	"encoding/csv"
+	"fmt"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"strconv"
+	"strings"
+)
+
+// A card in the wrong slot: an x16 card in a slot wired x8 or x4, behind a
+// riser, or in a slot of an older PCIe generation than the card's, links
+// slower than it was built to, and nothing says so. A model on the card
+// still decodes at the card's own memory speed, but it loads slower, a
+// tensor-parallel replica over PCIe is slower, and so is anything that
+// spills to the host. The driver says how the link stands and what the
+// card could do; the difference is reported where the node's warnings are.
+
+// PCIeLink is how a card is linked to its host.
+type PCIeLink struct {
+	// Gen is the fastest generation the card and the slot together allow —
+	// not the current one, which drops while the card idles, to save power.
+	// GPUGen is the card's own fastest, 0 when the driver does not say.
+	Gen    int `json:"gen,omitempty"`
+	GPUGen int `json:"gpu_gen,omitempty"`
+	// Width is the lanes in use now, WidthMax the card's most.
+	Width    int `json:"width,omitempty"`
+	WidthMax int `json:"width_max,omitempty"`
+}
+
+// laneGBs is one lane's usable rate in GB/s, by generation.
+var laneGBs = map[int]float64{1: 0.25, 2: 0.5, 3: 0.985, 4: 1.969, 5: 3.938, 6: 7.877}
+
+// GBs is what a link of gen and width carries, in GB/s each way.
+func pcieGBs(gen, width int) float64 { return laneGBs[gen] * float64(width) }
+
+// Problem says how a card's link falls short of what the card could do,
+// empty when it does not or the driver did not say.
+func (p PCIeLink) Problem() string {
+	gen := p.Gen
+	if p.GPUGen > 0 && gen == 0 {
+		gen = p.GPUGen
+	}
+	slowGen := p.GPUGen > 0 && p.Gen > 0 && p.Gen < p.GPUGen
+	narrow := p.WidthMax > 0 && p.Width > 0 && p.Width < p.WidthMax
+	if !slowGen && !narrow {
+		return ""
+	}
+	could := pcieGBs(max(p.GPUGen, gen), p.WidthMax)
+	has := pcieGBs(gen, p.Width)
+	var why []string
+	if narrow {
+		why = append(why, fmt.Sprintf("x%d of its x%d lanes", p.Width, p.WidthMax))
+	}
+	if slowGen {
+		why = append(why, fmt.Sprintf("PCIe Gen%d of its Gen%d", p.Gen, p.GPUGen))
+	}
+	return fmt.Sprintf("linked at %s: %.1f GB/s where it could have %.1f. "+
+		"Check the slot (wired fewer lanes, or an older generation), a riser, or the BIOS's PCIe setting",
+		strings.Join(why, " and "), has, could)
+}
+
+// pcieFields are asked apart from the rest, and the card's own fastest
+// generation apart again: a driver that does not know a field refuses the
+// whole query, and these must not cost a node its cards.
+var pcieFields = [][]string{
+	{"index", "pcie.link.gen.max", "pcie.link.width.current", "pcie.link.width.max", "pcie.link.gen.gpumax"},
+	{"index", "pcie.link.gen.max", "pcie.link.width.current", "pcie.link.width.max"},
+}
+
+// readPCIe fills each card's link from nvidia-smi, leaving it empty when
+// the driver says nothing of it.
+func readPCIe(ctx context.Context, binary string, cards []GPU) {
+	for _, fields := range pcieFields {
+		out, err := exec.CommandContext(ctx, binary, "--query-gpu="+strings.Join(fields, ","),
+			"--format=csv,noheader,nounits").Output()
+		if err != nil {
+			continue
+		}
+		links := parsePCIe(string(out))
+		for i := range cards {
+			if l, ok := links[cards[i].Index]; ok && cards[i].MIG == nil {
+				cards[i].PCIe = l
+			}
+		}
+		break
+	}
+	for i := range cards {
+		if cards[i].MIG == nil {
+			cards[i].PCIe = withSysfs(cards[i].PCIe, "/sys/bus/pci/devices", cards[i].PCIBusID)
+		}
+	}
+}
+
+// withSysfs takes the card's own lane count, and its own fastest
+// generation, from the kernel: the driver's width.max is what card and slot
+// allow together, so a x16 card in a slot wired x8 reads x8 of x8 there,
+// while the device's max_link_width is the card's, 16.
+func withSysfs(l PCIeLink, root, busID string) PCIeLink {
+	dev := sysfsBusID(busID)
+	if dev == "" {
+		return l
+	}
+	read := func(name string) string {
+		b, err := os.ReadFile(filepath.Join(root, dev, name)) //nolint:gosec // under /sys
+		if err != nil {
+			return ""
+		}
+		return strings.TrimSpace(string(b))
+	}
+	if n, err := strconv.Atoi(read("max_link_width")); err == nil && n > 0 {
+		l.WidthMax = n
+	}
+	if n, err := strconv.Atoi(read("current_link_width")); err == nil && n > 0 {
+		l.Width = n
+	}
+	if g := genOfSpeed(read("max_link_speed")); g > 0 && l.GPUGen == 0 {
+		l.GPUGen = g
+	}
+	return l
+}
+
+// sysfsBusID is nvidia-smi's 00000000:3B:00.0 as the kernel names it,
+// 0000:3b:00.0.
+func sysfsBusID(id string) string {
+	id = strings.ToLower(strings.TrimSpace(id))
+	dom, rest, ok := strings.Cut(id, ":")
+	if !ok || len(dom) < 4 {
+		return ""
+	}
+	return dom[len(dom)-4:] + ":" + rest
+}
+
+// genOfSpeed is the PCIe generation of a link speed as sysfs writes it.
+func genOfSpeed(s string) int {
+	switch {
+	case strings.HasPrefix(s, "2.5 GT/s"):
+		return 1
+	case strings.HasPrefix(s, "5.0 GT/s"), strings.HasPrefix(s, "5 GT/s"):
+		return 2
+	case strings.HasPrefix(s, "8.0 GT/s"), strings.HasPrefix(s, "8 GT/s"):
+		return 3
+	case strings.HasPrefix(s, "16.0 GT/s"), strings.HasPrefix(s, "16 GT/s"):
+		return 4
+	case strings.HasPrefix(s, "32.0 GT/s"), strings.HasPrefix(s, "32 GT/s"):
+		return 5
+	case strings.HasPrefix(s, "64.0 GT/s"), strings.HasPrefix(s, "64 GT/s"):
+		return 6
+	}
+	return 0
+}
+
+func parsePCIe(out string) map[int]PCIeLink {
+	r := csv.NewReader(strings.NewReader(out))
+	r.TrimLeadingSpace = true
+	r.FieldsPerRecord = -1
+	rows, _ := r.ReadAll()
+	num := func(s string) int {
+		n, _ := strconv.Atoi(strings.TrimSpace(s))
+		return n
+	}
+	links := map[int]PCIeLink{}
+	for _, row := range rows {
+		if len(row) < 4 {
+			continue
+		}
+		idx, err := strconv.Atoi(strings.TrimSpace(row[0]))
+		if err != nil {
+			continue
+		}
+		l := PCIeLink{Gen: num(row[1]), Width: num(row[2]), WidthMax: num(row[3])}
+		if len(row) > 4 {
+			l.GPUGen = num(row[4])
+		}
+		links[idx] = l
+	}
+	return links
+}

internal/agent/discovery/pcie_test.go

@@ -0,0 +1,54 @@
+package discovery
+
+import (
+	"os"
+	"path/filepath"
+	"strings"
+	"testing"
+)
+
+func TestACardInTheWrongSlotIsSaidSo(t *testing.T) {
+	for _, c := range []struct {
+		link PCIeLink
+		want string // empty: nothing to say
+	}{
+		// The PoC's Quadro RTX 6000, idle: current Gen1, but its fastest is 3,
+		// as the card's is, on all 16 lanes. Nothing wrong.
+		{PCIeLink{Gen: 3, GPUGen: 3, Width: 16, WidthMax: 16}, ""},
+		// An x16 card in a slot wired x8.
+		{PCIeLink{Gen: 4, GPUGen: 4, Width: 8, WidthMax: 16}, "x8 of its x16 lanes: 15.8 GB/s where it could have 31.5"},
+		// A Gen5 card in a Gen4 slot.
+		{PCIeLink{Gen: 4, GPUGen: 5, Width: 16, WidthMax: 16}, "PCIe Gen4 of its Gen5: 31.5 GB/s where it could have 63.0"},
+		// Both, behind a riser.
+		{PCIeLink{Gen: 3, GPUGen: 4, Width: 4, WidthMax: 16}, "x4 of its x16 lanes and PCIe Gen3 of its Gen4"},
+		// A driver that says nothing.
+		{PCIeLink{}, ""},
+	} {
+		got := c.link.Problem()
+		if (c.want == "") != (got == "") || !strings.Contains(got, c.want) {
+			t.Errorf("%+v: %q, want %q", c.link, got, c.want)
+		}
+	}
+}
+
+func TestTheLinkIsReadFromNvidiaSMI(t *testing.T) {
+	links := parsePCIe("0, 3, 16, 16, 3\n1, 4, 8, 16, [N/A]\n")
+	if links[0] != (PCIeLink{Gen: 3, GPUGen: 3, Width: 16, WidthMax: 16}) || links[1] != (PCIeLink{Gen: 4, Width: 8, WidthMax: 16}) {
+		t.Errorf("%+v", links)
+	}
+}
+
+func TestTheCardsOwnLanesComeFromTheKernel(t *testing.T) {
+	// The driver says x8 of x8 for a x16 card in a slot wired x8; the
+	// device's own max_link_width says 16.
+	root := t.TempDir()
+	dev := filepath.Join(root, "0000:3b:00.0")
+	_ = os.MkdirAll(dev, 0o755)
+	for f, v := range map[string]string{"max_link_width": "16", "current_link_width": "8", "max_link_speed": "16.0 GT/s PCIe"} {
+		_ = os.WriteFile(filepath.Join(dev, f), []byte(v+"\n"), 0o644)
+	}
+	l := withSysfs(PCIeLink{Gen: 4, Width: 8, WidthMax: 8}, root, "00000000:3B:00.0")
+	if l.WidthMax != 16 || l.Width != 8 || l.GPUGen != 4 || !strings.Contains(l.Problem(), "x8 of its x16") {
+		t.Errorf("%+v: %q", l, l.Problem())
+	}
+}

internal/agent/discovery/sensors.go

@@ -41,6 +41,14 @@ type GPUSensor struct {
 	// is running free. Idle and application clock settings are left out;
 	// they are not the card being held back.
 	Throttle []string
+	// How busy it is, read with the rest every sample. Discovery reads the
+	// same once, at start, which made a busy card look as idle as it was
+	// when the agent came up. -1 is not reported by the driver; zero
+	// MemoryTotalMB is a sample without these at all.
+	UtilPercent, MemUtilPercent float64
+	MemoryUsedMB, MemoryTotalMB float64
+	SMClockMHz                  float64
+	ECCUncorrected              float64
 }
 
 // sensorEvery bounds how often nvidia-smi is run. Heartbeats come more often
@@ -66,6 +74,13 @@ func NewSensorSampler() *SensorSampler {
 	return &SensorSampler{sys: "/sys", smi: runSMI, now: time.Now}
 }
 
+// SampleGPUs reads every card's heat, power and how busy it is now, without
+// a sampler's ten seconds of memory: for a screen that asks every few seconds
+// and wants what it asked for. Nil on a machine without nvidia-smi or a card.
+func SampleGPUs(ctx context.Context) []GPUSensor {
+	return (&SensorSampler{smi: runSMI}).gpus(ctx)
+}
+
 func runSMI(ctx context.Context, fields string) ([]byte, error) {
 	ctx, cancel := context.WithTimeout(ctx, 5*time.Second)
 	defer cancel()
@@ -187,13 +202,33 @@ var throttleBits = []struct {
 // gpus asks nvidia-smi for each card's heat and power. The memory temperature
 // is not known to every driver, and a field nvidia-smi does not know fails the
 // whole query, so it is asked for first and dropped on failure.
+// gpuFields are what each sample asks nvidia-smi for, in order. The busy
+// figures follow the throttle reasons; the memory temperature is last, being
+// the one field a driver may reject outright.
+const (
+	gpuBase  = "index,temperature.gpu,power.draw,enforced.power.limit,clocks_throttle_reasons.active"
+	gpuBusy  = ",utilization.gpu,utilization.memory,memory.used,memory.total,clocks.sm,ecc.errors.uncorrected.volatile.total"
+	gpuHBMTC = ",temperature.memory"
+)
+
 func (s *SensorSampler) gpus(ctx context.Context) []GPUSensor {
-	withMem := "index,temperature.gpu,power.draw,enforced.power.limit,clocks_throttle_reasons.active,temperature.memory"
-	out, err := s.smi(ctx, withMem)
-	if err != nil {
-		if out, err = s.smi(ctx, strings.TrimSuffix(withMem, ",temperature.memory")); err != nil {
-			return nil
+	// Most fields first, fewer on a driver that refuses one: a query naming
+	// a field the driver does not know fails as a whole.
+	var out []byte
+	var busy bool
+	for _, q := range []struct {
+		fields string
+		busy   bool
+	}{{gpuBase + gpuBusy + gpuHBMTC, true}, {gpuBase + gpuBusy, true}, {gpuBase + gpuHBMTC, false}, {gpuBase, false}} {
+		var err error
+		if out, err = s.smi(ctx, q.fields); err == nil {
+			busy = q.busy
+			break
 		}
+		out = nil
+	}
+	if out == nil {
+		return nil
 	}
 	var gs []GPUSensor
 	for _, line := range strings.Split(strings.TrimSpace(string(out)), "\n") {
@@ -216,14 +251,31 @@ func (s *SensorSampler) gpus(ctx context.Context) []GPUSensor {
 				}
 			}
 		}
-		if len(f) > 5 {
-			g.MemoryTempC = num(f[5])
+		rest := f[5:]
+		if busy && len(rest) >= 6 {
+			g.UtilPercent, g.MemUtilPercent = numOrUnknown(rest[0]), numOrUnknown(rest[1])
+			g.MemoryUsedMB, g.MemoryTotalMB = num(rest[2]), num(rest[3])
+			g.SMClockMHz, g.ECCUncorrected = num(rest[4]), numOrUnknown(rest[5])
+			rest = rest[6:]
+		}
+		if len(rest) > 0 {
+			g.MemoryTempC = num(rest[0])
 		}
 		gs = append(gs, g)
 	}
 	return gs
 }
 
+// numOrUnknown is a figure, or -1 where nvidia-smi says it has none: a card
+// without ECC has no error count, which is not the same as none.
+func numOrUnknown(s string) float64 {
+	v, err := strconv.ParseFloat(s, 64)
+	if err != nil || v < 0 {
+		return -1
+	}
+	return v
+}
+
 // num reads a figure nvidia-smi may give as "[N/A]" or "N/A".
 func num(s string) float64 {
 	v, err := strconv.ParseFloat(s, 64)

internal/agent/discovery/sensors_test.go

@@ -167,3 +167,44 @@ func TestADriverThatDoesNotKnowMemoryTemperatureStillReportsTheRest(t *testing.T
 		t.Errorf("%+v", got.GPUs)
 	}
 }
+
+func TestEachSampleSaysHowBusyEachGPUIs(t *testing.T) {
+	// What the card is doing now, every sample: discovery read it once, at
+	// start, and a card busy since looked as idle as it was then.
+	smi := func(_ context.Context, fields string) ([]byte, error) {
+		if !strings.Contains(fields, "utilization.gpu") {
+			return nil, errors.New("asked without how busy the cards are")
+		}
+		return []byte(
+			"0, 71, 612.45, 700.00, 0x0000000000000000, 97, 64, 71234, 81559, 1980, 0, 84\n" +
+				"1, 30, 70.10, 700.00, 0x0000000000000001, 0, 0, 512, 81559, 345, [N/A], [N/A]\n"), nil
+	}
+	now := time.Now()
+	got := sampler(t.TempDir(), smi, &now).Sample(t.Context()).GPUs
+	if len(got) != 2 {
+		t.Fatalf("%+v", got)
+	}
+	g0, g1 := got[0], got[1]
+	if g0.UtilPercent != 97 || g0.MemUtilPercent != 64 || g0.MemoryUsedMB != 71234 || g0.MemoryTotalMB != 81559 ||
+		g0.SMClockMHz != 1980 || g0.ECCUncorrected != 0 || g0.MemoryTempC != 84 {
+		t.Errorf("card 0 %+v", g0)
+	}
+	// Idle is zero; a count the card does not keep is unknown, not zero.
+	if g1.UtilPercent != 0 || g1.ECCUncorrected != -1 || g1.MemoryTempC != 0 {
+		t.Errorf("card 1 %+v", g1)
+	}
+}
+
+func TestADriverThatDoesNotKnowTheBusyFieldsStillReportsHeatAndPower(t *testing.T) {
+	smi := func(_ context.Context, fields string) ([]byte, error) {
+		if strings.Contains(fields, "utilization.gpu") {
+			return nil, errors.New(`Field "ecc.errors.uncorrected.volatile.total" is not a valid field to query.`)
+		}
+		return []byte("0, 66, 250.0, 300.0, 0x0000000000000000, 70\n"), nil
+	}
+	now := time.Now()
+	got := sampler(t.TempDir(), smi, &now).Sample(t.Context()).GPUs
+	if len(got) != 1 || got[0].TempC != 66 || got[0].MemoryTempC != 70 || got[0].MemoryTotalMB != 0 {
+		t.Errorf("%+v", got)
+	}
+}

internal/agent/discovery/topo.go

@@ -166,19 +166,25 @@ func splitTabs(l string) []string {
 
 // Apply puts the topology on the GPUs it describes. What a GPU already knows
 // — NVLink peers from NVML, which is the more exact source — is kept.
+//
+// The matrix is of whole cards. A MIG instance takes its card's NUMA node and
+// adapters, and none of its NVLink: instances cannot reach each other or any
+// other card over it, and peers listed for one would draw a tensor-parallel
+// group onto it.
 func (t Topology) Apply(gpus []GPU) {
 	for i := range gpus {
 		g := &gpus[i]
-		if len(g.NVLinkPeers) == 0 {
-			for peer := range t.NVLink[g.Index] {
+		card := g.CardIndex()
+		if len(g.NVLinkPeers) == 0 && !g.IsMIG() {
+			for peer := range t.NVLink[card] {
 				g.NVLinkPeers = append(g.NVLinkPeers, peer)
 			}
 			sort.Ints(g.NVLinkPeers)
 		}
-		if n, ok := t.NUMA[g.Index]; ok {
+		if n, ok := t.NUMA[card]; ok {
 			g.NUMANode = n
 		}
-		if paths := t.NICPath[g.Index]; len(paths) > 0 {
+		if paths := t.NICPath[card]; len(paths) > 0 {
 			g.NICPaths = paths
 		}
 	}

internal/agent/engines/comfyui.go

@@ -0,0 +1,151 @@
+package engines
+
+import (
+	"context"
+	"fmt"
+	"net"
+	"os"
+	"path/filepath"
+	"regexp"
+	"strconv"
+	"sync/atomic"
+)
+
+// ComfyUIConfig locates a ComfyUI installation.
+type ComfyUIConfig struct {
+	// Dir is ComfyUI's directory, where main.py is. Readable by the user
+	// engines run as.
+	Dir string `koanf:"dir"`
+	// Python is the interpreter of its environment; Dir's .venv when unset.
+	Python string `koanf:"python"`
+}
+
+// ComfyUI runs ComfyUI as an engine, behind llmgw's gate (llmgw
+// comfyui-gate): ComfyUI asks for no key, so it listens on the loopback and
+// the gate, which does, on the replica's port. Its replicas make pictures
+// for /v1/images/generations.
+type ComfyUI struct {
+	cfg       ComfyUIConfig
+	installed atomic.Pointer[string]
+}
+
+// Name identifies the engine in the catalog.
+func (*ComfyUI) Name() string { return "comfyui" }
+
+// HealthPath is the gate's, which answers once ComfyUI does.
+func (*ComfyUI) HealthPath() string { return "/health" }
+
+// MetricsPath is empty: ComfyUI publishes no metrics, and the router reads
+// none from it.
+func (*ComfyUI) MetricsPath() string { return "" }
+
+// ServesHTTP is true: a ComfyUI replica is one process on one node.
+func (*ComfyUI) ServesHTTP(ShardSpec) bool { return true }
+
+// UseInstalled points the engine at the environment the agent installed:
+// its interpreter, with ComfyUI's code beside its bin, in comfyui/.
+func (c *ComfyUI) UseInstalled(python string) { c.installed.Store(&python) }
+
+// Configured reports whether the configuration names a ComfyUI.
+func (c *ComfyUI) Configured() bool { return c.cfg.Dir != "" }
+
+func (c *ComfyUI) dir() string {
+	if p := c.installed.Load(); p != nil {
+		return filepath.Join(filepath.Dir(filepath.Dir(*p)), "comfyui")
+	}
+	return c.cfg.Dir
+}
+
+func (c *ComfyUI) python() string {
+	if p := c.installed.Load(); p != nil {
+		return *p
+	}
+	if c.cfg.Python != "" {
+		return c.cfg.Python
+	}
+	return filepath.Join(c.cfg.Dir, ".venv", "bin", "python")
+}
+
+var comfyVersion = regexp.MustCompile(`__version__\s*=\s*"([^"]+)"`)
+
+// Probe reports ComfyUI's version, from the file its build writes it to:
+// importing ComfyUI to ask would load torch and look for cards.
+func (c *ComfyUI) Probe(context.Context) (string, error) {
+	dir := c.dir()
+	if dir == "" {
+		return "", fmt.Errorf("no ComfyUI directory is configured")
+	}
+	if _, err := os.Stat(filepath.Join(dir, "main.py")); err != nil {
+		return "", fmt.Errorf("%s is not ComfyUI: %w", dir, err)
+	}
+	b, err := os.ReadFile(filepath.Join(dir, "comfyui_version.py"))
+	if err != nil {
+		return Unknown, nil //nolint:nilerr // installed, of a version it does not say
+	}
+	if m := comfyVersion.FindSubmatch(b); m != nil {
+		return string(m[1]), nil
+	}
+	return Unknown, nil
+}
+
+// Validate checks the profile: one card, on one node. ComfyUI runs a
+// workflow on one device and has no tensor parallelism to spread it by.
+func (*ComfyUI) Validate(p Profile, gpus []GPUInfo) error {
+	if p.Nodes > 1 || p.TP > 1 || p.PP > 1 || p.GPUsPerNode > 1 {
+		return fmt.Errorf("profile %q: ComfyUI runs on one GPU of one node", p.Name)
+	}
+	return validateCommon(p, gpus)
+}
+
+// Commands is the gate, which starts ComfyUI itself.
+func (c *ComfyUI) Commands(s ShardSpec) ([]Command, error) {
+	dir := c.dir()
+	if dir == "" {
+		return nil, fmt.Errorf("comfyui: no ComfyUI directory is configured (engines.comfyui.dir)")
+	}
+	bin, err := os.Executable()
+	if err != nil {
+		return nil, err
+	}
+	p := s.Profile
+	args := []string{"comfyui-gate",
+		"--listen", net.JoinHostPort(s.Host(), strconv.Itoa(s.HTTPPort)),
+		"--model", p.ServedModelName,
+		"--weights", p.ModelPath,
+		// Relative to where engines run — their user's home — so it is
+		// theirs to write.
+		"--state", filepath.Join("comfyui", s.ReplicaID),
+		"--python", c.python(),
+		"--comfyui", dir,
+		"--",
+	}
+	args = append(args, p.Args...)
+	env := baseEnv(s)
+	if s.APIKey != "" {
+		env["LLMGW_ENGINE_KEY"] = s.APIKey
+	}
+	// A model's custom nodes and the repository a node loads its weights by,
+	// which only the catalog sets — a profile's env may not name them — and
+	// so taken before baseEnv drops them. Without the repository the gate
+	// links no Hugging Face cache, and sf3d's node went to the network for
+	// its gated repository and was refused with a 401.
+	for _, k := range []string{comfyNodesEnv, comfyHFRepoEnv, SharedModelsEnv} {
+		if v := p.Env[k]; v != "" {
+			env[k] = v
+		}
+	}
+	return []Command{{Name: "comfyui", Path: bin, Args: args, Env: materializeEnv(env)}}, nil
+}
+
+// comfyNodesEnv is the custom nodes the catalog gives a ComfyUI model, as
+// JSON; catalog.NodesEnv and comfy.NodesEnv by the same name.
+const comfyNodesEnv = "LLMGW_COMFYUI_NODES"
+
+// comfyHFRepoEnv is the repository a custom node loads the weights by name
+// from; catalog.HFRepoEnv and comfy.HFRepoEnv by the same name.
+const comfyHFRepoEnv = "LLMGW_COMFYUI_HF_REPO"
+
+// SharedModelsEnv is a shared replica's members — name, source, and the
+// path the agent fetched it to — as JSON; catalog.SharedModelsEnv and
+// comfy.SharedModelsEnv by the same name.
+const SharedModelsEnv = "LLMGW_COMFYUI_MODELS"

internal/agent/engines/comfyui_test.go

@@ -0,0 +1,99 @@
+package engines
+
+import (
+	"os"
+	"path/filepath"
+	"slices"
+	"strings"
+	"testing"
+)
+
+func TestComfyUIRunsBehindTheGateWithItsKeyOutOfSight(t *testing.T) {
+	c := &ComfyUI{cfg: ComfyUIConfig{Dir: "/opt/comfyui"}}
+	cmds, err := c.Commands(ShardSpec{
+		ReplicaID: "r-flux-1", HTTPPort: 8100, BindAddr: "10.0.0.147", APIKey: "sekret", GPUIndices: []int{0},
+		Profile: Profile{Name: "p", Engine: "comfyui", ModelPath: "/w/flux.safetensors", ServedModelName: "flux",
+			Args: []string{"--disable-smart-memory"}},
+	})
+	if err != nil || len(cmds) != 1 {
+		t.Fatalf("%v %v", cmds, err)
+	}
+	args := strings.Join(cmds[0].Args, " ")
+	for _, want := range []string{"comfyui-gate", "--listen 10.0.0.147:8100", "--model flux", "--weights /w/flux.safetensors",
+		"--state comfyui/r-flux-1", "--python /opt/comfyui/.venv/bin/python", "--comfyui /opt/comfyui", "-- --disable-smart-memory"} {
+		if !strings.Contains(args, want) {
+			t.Errorf("%q not in %q", want, args)
+		}
+	}
+	if strings.Contains(args, "sekret") {
+		t.Error("the key is on the command line, where every user can read it")
+	}
+	if !slices.Contains(cmds[0].Env, "LLMGW_ENGINE_KEY=sekret") || !slices.Contains(cmds[0].Env, "CUDA_VISIBLE_DEVICES=0") {
+		t.Error("the key or the card is not in the environment")
+	}
+}
+
+func TestTheGateIsToldTheNodesAndTheRepositoryTheCatalogGives(t *testing.T) {
+	// The repository was dropped on the way: sf3d's node went to the network
+	// for its gated repository, with no cache linked, and got a 401.
+	c := &ComfyUI{cfg: ComfyUIConfig{Dir: "/opt/comfyui"}}
+	cmds, err := c.Commands(ShardSpec{
+		ReplicaID: "r-sf3d-1", HTTPPort: 8100, BindAddr: "10.0.0.147", GPUIndices: []int{0},
+		Profile: Profile{Name: "p", Engine: "comfyui", ModelPath: "/w/sf3d/", ServedModelName: "sf3d",
+			Env: map[string]string{comfyNodesEnv: `[{"repo":"x"}]`, comfyHFRepoEnv: "stabilityai/stable-fast-3d"}},
+	})
+	if err != nil || len(cmds) != 1 {
+		t.Fatalf("%v %v", cmds, err)
+	}
+	for _, want := range []string{comfyNodesEnv + `=[{"repo":"x"}]`, comfyHFRepoEnv + "=stabilityai/stable-fast-3d"} {
+		if !slices.Contains(cmds[0].Env, want) {
+			t.Errorf("%q not in the gate's environment", want)
+		}
+	}
+}
+
+func TestComfyUIRunsOnOneCard(t *testing.T) {
+	c := &ComfyUI{}
+	if err := c.Validate(Profile{Name: "p", ModelPath: "/w", TP: 2}, h100(2)); err == nil {
+		t.Error("a two-card ComfyUI profile was accepted")
+	}
+	if err := c.Validate(Profile{Name: "p", ModelPath: "/w", TP: 1}, h100(1)); err != nil {
+		t.Error(err)
+	}
+	if _, err := c.Commands(ShardSpec{Profile: Profile{ModelPath: "/w"}}); err == nil {
+		t.Error("commands without a ComfyUI directory")
+	}
+}
+
+func TestComfyUIIsOfferedByTheVersionItsBuildWrote(t *testing.T) {
+	dir := t.TempDir()
+	c := &ComfyUI{cfg: ComfyUIConfig{Dir: dir}}
+	if _, err := c.Probe(t.Context()); err == nil {
+		t.Error("a directory without main.py passed for ComfyUI")
+	}
+	_ = os.WriteFile(filepath.Join(dir, "main.py"), nil, 0o644)
+	_ = os.WriteFile(filepath.Join(dir, "comfyui_version.py"), []byte("__version__ = \"0.39.2\"\n"), 0o644)
+	if v, err := c.Probe(t.Context()); err != nil || v != "0.39.2" {
+		t.Errorf("%q %v", v, err)
+	}
+	if got := NewRegistry(Config{ComfyUI: ComfyUIConfig{Dir: dir}}).ProbeConfigured(t.Context()); got["comfyui"] != "0.39.2" {
+		t.Errorf("a configured ComfyUI is reported as %v", got)
+	}
+	if err := UnsafeArgs("comfyui", []string{"--enable-manager"}); err == nil {
+		t.Error("a profile may install ComfyUI nodes")
+	}
+}
+
+func TestAnInstalledComfyUIIsFoundBesideItsInterpreter(t *testing.T) {
+	c := &ComfyUI{cfg: ComfyUIConfig{Dir: "/opt/by-hand"}}
+	c.UseInstalled("/opt/llmgw/engines/comfyui/0.39.2-cu13/bin/python")
+	cmds, err := c.Commands(ShardSpec{ReplicaID: "r", HTTPPort: 1, Profile: Profile{ModelPath: "/w", ServedModelName: "m"}})
+	if err != nil {
+		t.Fatal(err)
+	}
+	args := strings.Join(cmds[0].Args, " ")
+	if !strings.Contains(args, "--python /opt/llmgw/engines/comfyui/0.39.2-cu13/bin/python") ||
+		!strings.Contains(args, "--comfyui /opt/llmgw/engines/comfyui/0.39.2-cu13/comfyui") {
+		t.Errorf("the installed ComfyUI is not what runs: %s", args)
+	}
+}

internal/agent/engines/compute.go

@@ -0,0 +1,79 @@
+package engines
+
+import (
+	"regexp"
+	"strconv"
+	"strings"
+)
+
+// Compute is where an engine runs its model, as it said while loading it.
+type Compute struct {
+	// Backend is CUDA, Vulkan, Metal, ROCm or CPU.
+	Backend string
+	// Devices are those it named: "CUDA0: Quadro RTX 6000 (7.5)".
+	Devices []string
+	// Offloaded of Total layers went to the devices; 0 and 0 when it did
+	// not say.
+	Offloaded, Total int
+	// NoGPU is the engine saying it found no device it could use.
+	NoGPU bool
+}
+
+var (
+	offloadedRE = regexp.MustCompile(`offloaded (\d+)/(\d+) layers to GPU`)
+	usingRE     = regexp.MustCompile(`using device ([A-Za-z]+\d+) \(([^)]*)\)`)
+	ccRE        = regexp.MustCompile(`Device (\d+): ([^,]+), compute capability ([0-9.]+)`)
+	noDevicesRE = regexp.MustCompile(`found 0 (CUDA|Vulkan|ROCm) devices|no usable GPU found`)
+)
+
+// ReadLlamaCompute reads llama.cpp's start-up output for where it put the
+// model, reporting false when the output says nothing of it.
+func ReadLlamaCompute(lines []string) (Compute, bool) {
+	var c Compute
+	known := false
+	cc := map[string]string{} // device index → compute capability
+	for _, l := range lines {
+		if m := ccRE.FindStringSubmatch(l); m != nil {
+			cc[m[1]] = m[3]
+		}
+	}
+	seen := map[string]bool{}
+	for _, l := range lines {
+		if m := offloadedRE.FindStringSubmatch(l); m != nil {
+			c.Offloaded, _ = strconv.Atoi(m[1])
+			c.Total, _ = strconv.Atoi(m[2])
+			known = true
+		}
+		if m := usingRE.FindStringSubmatch(l); m != nil && !seen[m[1]] {
+			seen[m[1]] = true
+			d := m[1] + ": " + strings.TrimSpace(m[2])
+			idx := strings.TrimLeft(m[1], "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz")
+			if v, ok := cc[idx]; ok && strings.HasPrefix(m[1], "CUDA") {
+				d += " (" + v + ")"
+			}
+			c.Devices = append(c.Devices, d)
+			if c.Backend == "" {
+				c.Backend = strings.TrimRight(m[1], "0123456789")
+			}
+			known = true
+		}
+		if noDevicesRE.MatchString(l) {
+			c.NoGPU, known = true, true
+		}
+	}
+	switch {
+	case c.OnTheCPU():
+		c.Backend = "CPU"
+	case c.Backend == "" && c.Offloaded > 0:
+		c.Backend = "GPU"
+	case c.Backend == "":
+		c.Backend = "CPU"
+	}
+	return c, known
+}
+
+// OnTheCPU is whether a model the engine was given GPUs for is computed on
+// the CPU, by its own account: no device found, or no layer offloaded.
+func (c Compute) OnTheCPU() bool {
+	return c.NoGPU || (c.Total > 0 && c.Offloaded == 0)
+}

internal/agent/engines/compute_test.go

@@ -0,0 +1,32 @@
+package engines
+
+import (
+	"strings"
+	"testing"
+)
+
+func TestLlamaCppSaysWhereItPutTheModel(t *testing.T) {
+	gpu := strings.Split(`ggml_cuda_init: found 1 CUDA devices:
+  Device 0: Quadro RTX 6000, compute capability 7.5, VMM: yes
+load_backend: loaded CUDA backend from /opt/llmgw/engines/llamacpp/b10991/libggml-cuda.so
+llama_model_load_from_file_impl: using device CUDA0 (Quadro RTX 6000) - 23800 MiB free
+load_tensors: offloading 48 repeating layers to GPU
+load_tensors: offloaded 49/49 layers to GPU`, "\n")
+	c, ok := ReadLlamaCompute(gpu)
+	if !ok || c.Backend != "CUDA" || c.Offloaded != 49 || c.Total != 49 || c.OnTheCPU() ||
+		len(c.Devices) != 1 || c.Devices[0] != "CUDA0: Quadro RTX 6000 (7.5)" {
+		t.Errorf("on the GPU: %+v %v", c, ok)
+	}
+
+	cpu := strings.Split(`warning: no usable GPU found, --gpu-layers option will be ignored
+warning: one possible reason is that llama.cpp was compiled without GPU support
+load_tensors: offloaded 0/49 layers to GPU`, "\n")
+	c, ok = ReadLlamaCompute(cpu)
+	if !ok || c.Backend != "CPU" || !c.OnTheCPU() {
+		t.Errorf("fell back to the CPU: %+v %v", c, ok)
+	}
+
+	if _, ok := ReadLlamaCompute([]string{"main: server is listening on http://127.0.0.1:20001"}); ok {
+		t.Error("output that says nothing was read as saying something")
+	}
+}

internal/agent/engines/engine.go

@@ -9,6 +9,7 @@
 package engines
 
 import (
+	"context"
 	"fmt"
 	"os"
 	"slices"
@@ -40,6 +41,15 @@ type Profile struct {
 	ModelPath string
 	// ServedModelName is the name clients use, which need not match the path.
 	ServedModelName string
+	// Adapters are LoRA adapters to load beside the model, in order: an
+	// adapter's index is the id requests apply it by.
+	Adapters []Adapter
+	// KVEvents has the engine publish its KV cache events to the agent,
+	// for the router's precise index. vLLM only.
+	KVEvents bool `json:"kv_events,omitempty"`
+	// AllowPickle lets the node fetch weights in a pickle format, which run
+	// code when loaded; the catalog's allow_pickle.
+	AllowPickle bool `json:"allow_pickle,omitempty"`
 }
 
 // ShardSpec is one shard of one replica on this node.
@@ -58,6 +68,12 @@ type ShardSpec struct {
 
 	// GPUIndices are the local GPUs this shard uses.
 	GPUIndices []int
+	// GPUUUIDs name the same devices by UUID, in the same order, and are set
+	// by the agent only when one of them is a MIG instance. An instance has
+	// no index CUDA knows: CUDA_VISIBLE_DEVICES=MIG-<uuid> is the only way to
+	// give a process one, and the indices placement uses for it (1000 and
+	// up) mean nothing to CUDA.
+	GPUUUIDs []string `json:"gpu_uuids,omitempty"`
 	// HCAs are the adapters of the chosen fabric, and only that fabric. A shard
 	// must never be given HCAs from two fabrics.
 	HCAs []string
@@ -69,13 +85,22 @@ type ShardSpec struct {
 
 	HTTPPort int
 	Profile  Profile
+	// BindAddr is the address the engine listens on: the node's management
+	// address, which is what the router reaches it on, set by the agent.
+	// Empty listens on every address.
+	BindAddr string `json:"bind_addr,omitempty"`
 
 	// APIKey is what the engine demands of every request. Engines listen on
-	// all of a node's addresses; without a key anybody who can reach the port
+	// the node's management address; without a key anybody who can reach it
 	// talks to the model directly, past the gateway's authentication, quotas
 	// and accounting. Given to the engine in its environment rather than on
 	// its command line, which every user on the node can read.
 	APIKey string `json:"api_key,omitempty"`
+	// KVEventsPort is the loopback port the agent receives this shard's KV
+	// cache events on, chosen by the agent; zero when it publishes none.
+	// Kept with the spec so an agent that restarts listens where the engine
+	// it adopts is still sending.
+	KVEventsPort int `json:"kv_events_port,omitempty"`
 	// Threads is the CPU cores placement reserved for a shard with no GPU,
 	// and so what its engine computes on. Zero leaves it to the engine's own
 	// configuration.
@@ -92,6 +117,18 @@ type ShardSpec struct {
 	// lets the control plane tell, after its own restart, whether a shard that
 	// is still running matches the profile the catalog holds now.
 	ProfileFP string
+
+	// Compute is where the engine said it put the model as it became ready,
+	// kept with the shard's state so an agent restarted later still knows.
+	Compute *Compute `json:",omitempty"`
+}
+
+// Host is where the engine listens.
+func (s ShardSpec) Host() string {
+	if s.BindAddr == "" {
+		return "0.0.0.0"
+	}
+	return s.BindAddr
 }
 
 // Leader reports whether this shard serves HTTP for the replica.
@@ -143,6 +180,22 @@ type Engine interface {
 	MetricsPath() string
 }
 
+// CPUFallback is an engine that can come up on the CPU when it was placed on
+// GPUs, and keep serving there without an error. The agent checks such a shard
+// is on its GPUs before calling it ready.
+type CPUFallback interface {
+	FallsBackToCPU() bool
+	// Devices lists the GPUs the engine's build can see, for saying why.
+	Devices(ctx context.Context) ([]string, error)
+}
+
+// HelpCommand is an engine whose program is not asked for its help by
+// running the command's path with --help, because the path is an interpreter
+// starting it through a launcher.
+type HelpCommand interface {
+	HelpCommand(c Command) (path string, args []string)
+}
+
 // GPUInfo is the subset of GPU facts validation needs.
 type GPUInfo struct {
 	Index             int
@@ -162,7 +215,10 @@ func NewRegistry(cfg Config) *Registry {
 	r.Add(&VLLM{cfg: cfg.VLLM})
 	r.Add(&SGLang{cfg: cfg.SGLang})
 	r.Add(&LlamaCpp{cfg: cfg.LlamaCpp})
+	r.Add(&TRTLLM{cfg: cfg.TRTLLM})
 	r.Add(&Sim{cfg: cfg.Sim})
+	r.Add(&ComfyUI{cfg: cfg.ComfyUI})
+	r.Add(&Strata{cfg: cfg.Strata})
 	return r
 }
 
@@ -200,10 +256,22 @@ func (r *Registry) Names() []string {
 
 // Config configures the engine adapters.
 type Config struct {
+	// Disabled are engines this node never installs or advertises, whatever
+	// the control plane asks: vLLM on a node of cards no build of it runs on,
+	// that is meant for llama.cpp alone.
+	Disabled []string       `koanf:"disabled"`
 	VLLM     VLLMConfig     `koanf:"vllm"`
 	SGLang   SGLangConfig   `koanf:"sglang"`
 	LlamaCpp LlamaCppConfig `koanf:"llamacpp"`
-	Sim      SimConfig      `koanf:"sim"`
+	// TRTLLM is TensorRT-LLM, which the agent does not install: a node
+	// offers it only when its interpreter is named here.
+	TRTLLM TRTLLMConfig `koanf:"trtllm"`
+	Sim    SimConfig    `koanf:"sim"`
+	// ComfyUI makes pictures; offered by a node whose ComfyUI is named here.
+	ComfyUI ComfyUIConfig `koanf:"comfyui"`
+	// Strata serves a few mixture-of-experts models from RAM and one card;
+	// offered by a node whose Strata is named here, or that installed it.
+	Strata StrataConfig `koanf:"strata"`
 }
 
 // --- shared helpers ---
@@ -228,7 +296,12 @@ func NCCLEnv(s ShardSpec) map[string]string { return baseEnv(s) }
 //     one instead of timing out.
 func baseEnv(s ShardSpec) map[string]string {
 	env := map[string]string{
-		"CUDA_VISIBLE_DEVICES": joinInts(s.GPUIndices),
+		"CUDA_VISIBLE_DEVICES": visibleDevices(s),
+		// The indices above are nvidia-smi's, which counts by PCI bus. CUDA
+		// counts fastest first unless told otherwise, and on a node with two
+		// kinds of GPU the shard would get a different card than placement
+		// gave it — one another shard may hold.
+		"CUDA_DEVICE_ORDER": "PCI_BUS_ID",
 	}
 
 	if len(s.HCAs) > 0 {
@@ -295,6 +368,21 @@ func materializeEnv(generated map[string]string) []string {
 	return out
 }
 
+// visibleDevices is CUDA_VISIBLE_DEVICES for a shard: the indices placement
+// gave it, or their UUIDs when the agent named them, which it does for a MIG
+// instance.
+func visibleDevices(s ShardSpec) string {
+	if len(s.GPUUUIDs) > 0 {
+		return strings.Join(s.GPUUUIDs, ",")
+	}
+	return joinInts(s.GPUIndices)
+}
+
+// OnMIG reports whether the shard was given a MIG instance.
+func (s ShardSpec) OnMIG() bool {
+	return slices.ContainsFunc(s.GPUUUIDs, func(u string) bool { return strings.HasPrefix(u, "MIG-") })
+}
+
 func joinInts(v []int) string {
 	parts := make([]string, len(v))
 	for i, n := range v {
@@ -373,3 +461,10 @@ func quantizationOf(args []string) string {
 	}
 	return ""
 }
+
+// Adapter is a LoRA adapter an engine loads beside its model. Path is a
+// source until the agent has fetched it, a local file after.
+type Adapter struct {
+	Name string `json:"name"`
+	Path string `json:"path"`
+}

internal/agent/engines/engines_test.go

@@ -323,8 +323,8 @@ func TestSGLangMultiNodeArgs(t *testing.T) {
 	if cmd.Path != "/opt/sglang/bin/python" {
 		t.Errorf("Path=%q", cmd.Path)
 	}
-	if cmd.Args[0] != "-m" || cmd.Args[1] != "sglang.launch_server" {
-		t.Errorf("not launched as a module: %v", cmd.Args[:2])
+	if cmd.Args[0] != "-c" || !strings.Contains(cmd.Args[1], `run_module("sglang.launch_server"`) {
+		t.Errorf("not launched as the module: %v", cmd.Args[:2])
 	}
 	if argValue(cmd.Args, "--nnodes") != "2" || argValue(cmd.Args, "--node-rank") != "1" {
 		t.Errorf("multi-node flags wrong: %v", cmd.Args)
@@ -334,6 +334,58 @@ func TestSGLangMultiNodeArgs(t *testing.T) {
 	}
 }
 
+func TestSGLangsKeyIsNotOnItsCommandLine(t *testing.T) {
+	s := singleNodeSpec()
+	s.APIKey = "k1"
+	cmd := buildOne(t, &SGLang{}, s)
+	if slices.Contains(cmd.Args, "k1") || slices.Contains(cmd.Args, "--api-key") {
+		t.Errorf("the key is in the arguments: %v", cmd.Args)
+	}
+	if !slices.Contains(cmd.Env, sglangKeyEnv+"=k1") {
+		t.Errorf("the key is not in the environment")
+	}
+	// A worker serves no HTTP, and is not given it.
+	w := multiNodeSpec(1)
+	w.APIKey = "k1"
+	if cmd := buildOne(t, &SGLang{}, w); slices.Contains(cmd.Env, sglangKeyEnv+"=k1") {
+		t.Error("a worker was given the key")
+	}
+}
+
+func TestEnginesListenOnTheAddressTheyAreGiven(t *testing.T) {
+	s := singleNodeSpec()
+	for _, e := range []Engine{&VLLM{}, &SGLang{}} {
+		s.BindAddr = ""
+		if got := argValue(buildOne(t, e, s).Args, "--host"); got != "0.0.0.0" {
+			t.Errorf("%s: without an address listens on %q", e.Name(), got)
+		}
+		s.BindAddr = "10.0.0.147"
+		if got := argValue(buildOne(t, e, s).Args, "--host"); got != "10.0.0.147" {
+			t.Errorf("%s: listens on %q, expected the management address", e.Name(), got)
+		}
+	}
+}
+
+func TestSGLangIsStartedServingItsMetrics(t *testing.T) {
+	// Without --enable-metrics SGLang has no /metrics, and every scrape of
+	// the replica fails as though it were unreachable.
+	if cmd := buildOne(t, &SGLang{}, singleNodeSpec()); !slices.Contains(cmd.Args, "--enable-metrics") {
+		t.Errorf("not started with its metrics: %v", cmd.Args)
+	}
+}
+
+func TestSGLangIsAskedForItsHelpThroughItsModule(t *testing.T) {
+	g := &SGLang{cfg: SGLangConfig{Python: "/opt/sglang/bin/python"}}
+	g.UseInstalled("/opt/llmgw/engines/sglang/0.5.21-cu13/bin/python")
+	path, args := g.HelpCommand(Command{})
+	if path != "/opt/llmgw/engines/sglang/0.5.21-cu13/bin/python" {
+		t.Errorf("asked %s, not the interpreter it was installed into", path)
+	}
+	if !slices.Equal(args, []string{"-m", "sglang.launch_server", "--help"}) {
+		t.Errorf("asked %v", args)
+	}
+}
+
 func TestSGLangSingleNodeOmitsMultiNodeFlags(t *testing.T) {
 	cmd := buildOne(t, &SGLang{}, singleNodeSpec())
 	for _, flag := range []string{"--nnodes", "--node-rank", "--dist-init-addr"} {
@@ -425,14 +477,14 @@ func TestValidateRequiresModelPath(t *testing.T) {
 
 func TestRegistry(t *testing.T) {
 	r := NewRegistry(Config{})
-	if got := r.Names(); !slices.Equal(got, []string{"llamacpp", "sglang", "sim", "vllm"}) {
+	if got := r.Names(); !slices.Equal(got, []string{"comfyui", "llamacpp", "sglang", "sim", "strata", "trtllm", "vllm"}) {
 		t.Errorf("registry contents: %v", got)
 	}
 	if _, err := r.Get("vllm"); err != nil {
 		t.Errorf("vllm missing: %v", err)
 	}
 	err := func() error { _, err := r.Get("nope"); return err }()
-	if err == nil || !strings.Contains(err.Error(), "llamacpp, sglang, sim, vllm") {
+	if err == nil || !strings.Contains(err.Error(), "llamacpp, sglang, sim, strata, trtllm, vllm") {
 		t.Errorf("an unknown engine should list what is available: %v", err)
 	}
 }

internal/agent/engines/kvevents_test.go

@@ -0,0 +1,47 @@
+package engines
+
+import (
+	"slices"
+	"strings"
+	"testing"
+)
+
+func TestAVLLMShardWithKVEventsPublishesToTheAgentOnLoopback(t *testing.T) {
+	s := singleNodeSpec()
+	s.Profile.KVEvents = true
+	s.KVEventsPort = 5999
+	s.Profile.Args = []string{"--max-model-len", "8192"}
+	cmd := buildOne(t, &VLLM{}, s)
+
+	i := slices.Index(cmd.Args, "--kv-events-config")
+	if i < 0 || !strings.Contains(cmd.Args[i+1], `"endpoint":"tcp://127.0.0.1:5999"`) {
+		t.Fatalf("args %v should name the agent's loopback port", cmd.Args)
+	}
+	if j := slices.Index(cmd.Args, "--prefix-caching-hash-algo"); j < 0 || cmd.Args[j+1] != "sha256_cbor" {
+		t.Fatalf("args %v should pin the hashing the router computes", cmd.Args)
+	}
+	if slices.Index(cmd.Args, "--max-model-len") < i {
+		t.Fatal("profile arguments come last, so an operator can still override")
+	}
+	if !slices.Contains(cmd.Env, "PYTHONHASHSEED=1729") {
+		t.Fatalf("env %v should fix the hash seed", cmd.Env)
+	}
+}
+
+func TestNoKVEventsWithoutAPortOrOffTheLeader(t *testing.T) {
+	s := singleNodeSpec()
+	s.Profile.KVEvents = true // but the agent could not listen
+	if cmd := buildOne(t, &VLLM{}, s); slices.Contains(cmd.Args, "--kv-events-config") {
+		t.Fatal("an engine told to publish where nobody listens only fills a queue")
+	}
+	w := multiNodeSpec(1)
+	w.Profile.KVEvents, w.KVEventsPort = true, 5999
+	if cmd := buildEngine(t, &VLLM{}, w); slices.Contains(cmd.Args, "--kv-events-config") {
+		t.Fatal("a headless worker has no scheduler to publish from")
+	}
+	off := singleNodeSpec()
+	off.KVEventsPort = 5999
+	if cmd := buildOne(t, &VLLM{}, off); slices.Contains(cmd.Args, "--kv-events-config") {
+		t.Fatal("kv_events is opt-in")
+	}
+}

internal/agent/engines/llamacpp.go

@@ -1,8 +1,10 @@
 package engines
 
 import (
+	"context"
 	"fmt"
 	"os"
+	"os/exec"
 	"path/filepath"
 	"runtime"
 	"sort"
@@ -65,25 +67,25 @@ func (*LlamaCpp) ServesHTTP(ShardSpec) bool { return true }
 
 // Validate checks the profile against the GPUs it would run on.
 //
-// The two refusals here are about not pretending: llama.cpp has no equivalent
-// of a tensor-parallel group spanning machines, and its multi-GPU support is a
-// different mechanism (--split-mode, --tensor-split) that this adapter does not
-// drive. Accepting either would produce a replica that starts and then serves
-// from one machine while the catalog believes it has several.
+// llama.cpp spreads a model over a node's GPUs by layer (--split-mode layer),
+// so gpus_per_node is how many it gets. It has no tensor parallelism and no
+// group spanning machines, and accepting tp or nodes would produce a replica
+// that serves from fewer cards, or one machine, while the catalog believes
+// otherwise.
 func (*LlamaCpp) Validate(p Profile, gpus []GPUInfo) error {
-	if err := validateCommon(p, gpus); err != nil {
-		return err
-	}
 	if p.Nodes > 1 {
 		return fmt.Errorf("profile %q: llamacpp does not span nodes; use vllm or sglang for a %d-node replica",
 			p.Name, p.Nodes)
 	}
-	if p.TP > 1 {
-		return fmt.Errorf("profile %q: llamacpp does not do tensor parallelism; "+
-			"it splits a model across local GPUs with --tensor-split, which this adapter does not drive",
-			p.Name)
+	if p.TP > 1 || p.PP > 1 {
+		return fmt.Errorf("profile %q: llamacpp splits a model across a node's GPUs by layer, not by tp or pp; "+
+			"write gpus_per_node: %d instead", p.Name, max(p.TP, 1)*max(p.PP, 1))
 	}
-	return nil
+	// The common checks count a replica's GPUs as tp; for llama.cpp the
+	// count is gpus_per_node.
+	q := p
+	q.TP = max(p.GPUsPerNode, 1)
+	return validateCommon(q, gpus)
 }
 
 // Commands returns the processes for one shard, which is always one process.
@@ -91,13 +93,13 @@ func (l *LlamaCpp) Commands(s ShardSpec) ([]Command, error) {
 	bin := l.bin()
 	p := s.Profile
 
-	model, err := ggufIn(p.ModelPath)
+	model, projector, err := ggufIn(p.ModelPath)
 	if err != nil {
 		return nil, err
 	}
 	args := []string{
 		"--model", model,
-		"--host", "0.0.0.0",
+		"--host", s.Host(),
 		"--port", strconv.Itoa(s.HTTPPort),
 		// Without this there is no /metrics, and an endpoint the router cannot
 		// measure is one it has to route to blind.
@@ -118,6 +120,11 @@ func (l *LlamaCpp) Commands(s ShardSpec) ([]Command, error) {
 	if p.ServedModelName != "" {
 		args = append(args, "--alias", p.ServedModelName)
 	}
+	// A vision model's projector, fetched beside it: what turns an image in
+	// a request into something the language model reads.
+	if projector != "" && !hasFlag(p.Args, "--mmproj", "-mm") {
+		args = append(args, "--mmproj", projector)
+	}
 	if !hasFlag(p.Args, "--parallel", "-np") {
 		n := l.cfg.Parallel
 		if n <= 0 {
@@ -132,6 +139,13 @@ func (l *LlamaCpp) Commands(s ShardSpec) ([]Command, error) {
 	if len(s.GPUIndices) > 0 && !hasFlag(p.Args, "--n-gpu-layers", "-ngl") {
 		args = append(args, "--n-gpu-layers", "999")
 	}
+	// Several GPUs: the layers spread across all of them, which is the only
+	// split llama.cpp does without a matched interconnect. In proportion to
+	// each card's free memory, which for the whole cards placement gives is
+	// an even split.
+	if len(s.GPUIndices) > 1 && !hasFlag(p.Args, "--split-mode", "-sm") {
+		args = append(args, "--split-mode", "layer")
+	}
 	if len(s.GPUIndices) == 0 && !hasFlag(p.Args, "--threads", "-t") {
 		// What placement reserved first: it is what the node's other
 		// replicas were placed around.
@@ -144,12 +158,33 @@ func (l *LlamaCpp) Commands(s ShardSpec) ([]Command, error) {
 		}
 		args = append(args, "--threads", strconv.Itoa(n))
 	}
+	// Loaded at start, applied per request: a request that names an adapter
+	// carries "lora": [{"id": i, "scale": s}], and one that names none is the
+	// base model. Each is loaded at scale zero, not with --lora and
+	// --lora-init-without-apply: that leaves an adapter's scale at 1, and
+	// llama-server applies it at that scale to every request with no "lora"
+	// of its own — every request for the model itself.
+	for _, a := range p.Adapters {
+		args = append(args, "--lora-scaled", a.Path+":0")
+	}
 	args = append(args, p.Args...)
 
 	env := baseEnv(s)
 	if s.APIKey != "" {
 		env["LLAMA_API_KEY"] = s.APIKey
 	}
+	// The Vulkan build — what a GPU older than the CUDA builds gets — does
+	// not read CUDA_VISIBLE_DEVICES; this is its own. Vulkan numbers devices
+	// as the driver lists them, which on NVIDIA follows the same bus order
+	// as nvidia-smi; were it not to, the shard would not hold memory on its
+	// own GPUs, and starting it checks exactly that.
+	//
+	// Not on a MIG instance, which Vulkan does not see at all: only CUDA
+	// opens one, by the UUID CUDA_VISIBLE_DEVICES carries, and an index here
+	// would name some other card.
+	if len(s.GPUIndices) > 0 && !s.OnMIG() {
+		env["GGML_VK_VISIBLE_DEVICES"] = joinInts(s.GPUIndices)
+	}
 	return []Command{{
 		Name: "llama-server", Path: bin, Args: args, Env: materializeEnv(env),
 	}}, nil
@@ -177,30 +212,46 @@ func hasFlag(args []string, names ...string) bool {
 //
 // A path that is already a file is returned untouched, which is every
 // single-file model and every hand-staged one.
-func ggufIn(path string) (string, error) {
+//
+// A vision projector in the directory — an mmproj file — is not the model:
+// it is returned second, to be loaded beside it.
+func ggufIn(path string) (model, projector string, err error) {
 	st, err := os.Stat(path)
 	if err != nil || !st.IsDir() {
 		// Not a directory, or not there at all — the second is the engine's to
 		// report, with the message it would have given anyway.
-		return path, nil //nolint:nilerr // a missing path is the engine's error to give
+		return path, "", nil //nolint:nilerr // a missing path is the engine's error to give
 	}
 	entries, err := os.ReadDir(path)
 	if err != nil {
-		return "", err
+		return "", "", err
 	}
-	var names []string
+	var names, projectors []string
 	for _, e := range entries {
-		if !e.IsDir() && strings.HasSuffix(strings.ToLower(e.Name()), ".gguf") {
+		lower := strings.ToLower(e.Name())
+		if e.IsDir() || !strings.HasSuffix(lower, ".gguf") {
+			continue
+		}
+		if strings.Contains(lower, "mmproj") {
+			projectors = append(projectors, e.Name())
+		} else {
 			names = append(names, e.Name())
 		}
 	}
 	if len(names) == 0 {
-		return "", fmt.Errorf("%s holds no .gguf file", path)
+		if len(projectors) > 0 {
+			return "", "", fmt.Errorf("%s holds a vision projector and no model", path)
+		}
+		return "", "", fmt.Errorf("%s holds no .gguf file", path)
 	}
 	// Sorted, so a split model's first part comes first: the parts are named
 	// "-00001-of-00004" and lexical order is shard order.
 	sort.Strings(names)
-	return filepath.Join(path, names[0]), nil
+	if len(projectors) > 0 {
+		sort.Strings(projectors)
+		projector = filepath.Join(path, projectors[0])
+	}
+	return filepath.Join(path, names[0]), projector, nil
 }
 
 // UseInstalled points the engine at a build the agent installed and checked.
@@ -225,3 +276,41 @@ func (l *LlamaCpp) bin() string {
 	}
 	return "llama-server"
 }
+
+// Binary is the llama-server this engine runs.
+func (l *LlamaCpp) Binary() string { return l.bin() }
+
+// FallsBackToCPU says that llama.cpp keeps running when its GPU backend does
+// not load: --n-gpu-layers asks for layers on a GPU it then has none of, and
+// the server comes up and answers on the CPU, at a tenth of the speed, with no
+// error anywhere. Its readiness on a GPU placement needs checking separately.
+func (*LlamaCpp) FallsBackToCPU() bool { return true }
+
+// Devices lists the GPUs this build can compute on, as llama-server's
+// --list-devices names them ("CUDA0: NVIDIA L4 (22994 MiB, 22713 MiB free)").
+// Empty, on a machine with GPUs, is a build whose GPU backend did not load:
+// the CPU build, or a CUDA build missing a library its backend links.
+func (l *LlamaCpp) Devices(ctx context.Context) ([]string, error) {
+	out, err := exec.CommandContext(ctx, l.bin(), "--list-devices").CombinedOutput() //nolint:gosec // the engine's own binary
+	if err != nil {
+		return nil, fmt.Errorf("%s --list-devices: %v: %s", l.bin(), err, strings.TrimSpace(string(out)))
+	}
+	return parseDevices(string(out)), nil
+}
+
+// parseDevices reads --list-devices: the lines after "Available devices:",
+// which says "(none)" when there are none. Log lines before it are skipped.
+func parseDevices(out string) []string {
+	var devs []string
+	listing := false
+	for _, line := range strings.Split(out, "\n") {
+		line = strings.TrimSpace(line)
+		switch {
+		case strings.HasPrefix(line, "Available devices"):
+			listing = true
+		case listing && line != "" && line != "(none)":
+			devs = append(devs, line)
+		}
+	}
+	return devs
+}

internal/agent/engines/llamacpp_test.go

@@ -204,7 +204,7 @@ func TestASetDirectoryResolvesToItsFirstPart(t *testing.T) {
 		}
 	}
 
-	got, err := ggufIn(dir)
+	got, _, err := ggufIn(dir)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -221,7 +221,7 @@ func TestAPlainFilePathIsUntouched(t *testing.T) {
 	if err := os.WriteFile(p, []byte("x"), 0o644); err != nil {
 		t.Fatal(err)
 	}
-	if got, _ := ggufIn(p); got != p {
+	if got, _, _ := ggufIn(p); got != p {
 		t.Errorf("expected the path unchanged, got %s", got)
 	}
 }
@@ -231,7 +231,7 @@ func TestADirectoryWithNoWeightsSaysSo(t *testing.T) {
 	if err := os.WriteFile(filepath.Join(dir, "config.json"), []byte("{}"), 0o644); err != nil {
 		t.Fatal(err)
 	}
-	if _, err := ggufIn(dir); err == nil {
+	if _, _, err := ggufIn(dir); err == nil {
 		t.Error("a directory with no .gguf in it is not a model llama.cpp can load")
 	}
 }
@@ -240,7 +240,7 @@ func TestAMissingPathIsLeftToTheEngine(t *testing.T) {
 	// The engine's own "no such file" names the path and the flag it came
 	// from, which is more use than anything this could say.
 	p := "/nonexistent/model.gguf"
-	got, err := ggufIn(p)
+	got, _, err := ggufIn(p)
 	if err != nil || got != p {
 		t.Errorf("expected it passed through, got %q %v", got, err)
 	}
@@ -306,3 +306,83 @@ func TestTheCoresPlacementReservedAreTheThreads(t *testing.T) {
 		t.Errorf("--threads %q; what placement reserved should win over the node's setting", v)
 	}
 }
+
+func TestAdaptersAreLoadedAtStartAndAppliedToNoneByDefault(t *testing.T) {
+	s := llamaSpec(nil)
+	s.Profile.Adapters = []Adapter{{Name: "sql", Path: "/w/sql.gguf"}, {Name: "docs", Path: "/w/docs.gguf"}}
+	cmds, err := (&LlamaCpp{}).Commands(s)
+	if err != nil {
+		t.Fatal(err)
+	}
+	args := strings.Join(cmds[0].Args, " ")
+	if !strings.Contains(args, "--lora-scaled /w/sql.gguf:0 --lora-scaled /w/docs.gguf:0") {
+		t.Errorf("args %s: both adapters, in order, loaded at scale zero", args)
+	}
+	plain, _ := (&LlamaCpp{}).Commands(llamaSpec(nil))
+	if strings.Contains(strings.Join(plain[0].Args, " "), "--lora") {
+		t.Error("a model with no adapters was given lora flags")
+	}
+}
+
+func TestDevicesAreReadFromListDevices(t *testing.T) {
+	cuda := "ggml_cuda_init: found 2 CUDA devices:\nAvailable devices:\n  CUDA0: NVIDIA L4 (22994 MiB, 22713 MiB free)\n  CUDA1: NVIDIA L4 (22994 MiB, 22713 MiB free)\n"
+	if got := parseDevices(cuda); len(got) != 2 || !strings.HasPrefix(got[0], "CUDA0: NVIDIA L4") {
+		t.Errorf("CUDA build: %q", got)
+	}
+	// A CUDA build whose backend did not load says what the CPU build says.
+	if got := parseDevices("Available devices:\n  (none)\n"); len(got) != 0 {
+		t.Errorf("no devices: %q", got)
+	}
+}
+
+func TestLlamaCppSpreadsAReplicaOverItsNodesGPUsByLayer(t *testing.T) {
+	four := Profile{Name: "t4x4", Engine: "llamacpp", GPUClass: "t4", TP: 1, GPUsPerNode: 4, ModelPath: "/m"}
+	if err := (&LlamaCpp{}).Validate(four, h100(4)); err != nil {
+		t.Fatalf("four GPUs on a four-GPU node: %v", err)
+	}
+	if err := (&LlamaCpp{}).Validate(four, h100(2)); err == nil {
+		t.Error("four GPUs were accepted on a node with two")
+	}
+
+	s := llamaSpec([]int{0, 1, 2, 3})
+	s.Profile.GPUsPerNode = 4
+	cmds, err := (&LlamaCpp{}).Commands(s)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if v, _ := flagValue(cmds[0].Args, "--split-mode"); v != "layer" {
+		t.Errorf("--split-mode %q over four GPUs", v)
+	}
+	if !slices.Contains(cmds[0].Env, "CUDA_VISIBLE_DEVICES=0,1,2,3") {
+		t.Errorf("env %v: the replica must see all four of its GPUs", cmds[0].Env)
+	}
+	one, _ := (&LlamaCpp{}).Commands(llamaSpec([]int{2}))
+	if hasFlag(one[0].Args, "--split-mode") {
+		t.Error("a one-GPU replica was given a split mode")
+	}
+}
+
+func TestAVisionProjectorIsLoadedBesideTheModelNotAsIt(t *testing.T) {
+	dir := t.TempDir()
+	// "mmproj" sorts before the model's name; it must still not be taken for it.
+	for _, n := range []string{"gemma-3-4b-it-Q4_K_M.gguf", "mmproj-gemma-3-4b-it-f16.gguf"} {
+		if err := os.WriteFile(filepath.Join(dir, n), []byte("x"), 0o644); err != nil {
+			t.Fatal(err)
+		}
+	}
+	cmds, err := (&LlamaCpp{}).Commands(ShardSpec{HTTPPort: 8080, Profile: Profile{ModelPath: dir}})
+	if err != nil {
+		t.Fatal(err)
+	}
+	args := strings.Join(cmds[0].Args, " ")
+	if !strings.Contains(args, "--model "+filepath.Join(dir, "gemma-3-4b-it-Q4_K_M.gguf")) ||
+		!strings.Contains(args, "--mmproj "+filepath.Join(dir, "mmproj-gemma-3-4b-it-f16.gguf")) {
+		t.Errorf("%s", args)
+	}
+	// One the profile names itself is left as it is.
+	cmds, _ = (&LlamaCpp{}).Commands(ShardSpec{HTTPPort: 8080, Profile: Profile{ModelPath: dir,
+		Args: []string{"--mmproj", "/elsewhere.gguf"}}})
+	if strings.Count(strings.Join(cmds[0].Args, " "), "--mmproj") != 1 {
+		t.Errorf("two projectors: %v", cmds[0].Args)
+	}
+}