A btop-like monitor in the console, from Prometheus; node exporters discovered and installed

Monitor draws CPU, memory, GPUs, requests, tokens, latency, network and disk
as Braille charts over 5m/1h/24h/7d, then per node, card and model
sparklines; node and model pages have their own. History is read from
monitoring.prometheus through POST /api/v1/metrics/range, or without it
from what the console saw. The control plane serves the cluster's machines
for Prometheus http_sd at /prometheus/targets on its metrics port, and node
add installs prometheus-node-exporter.

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

internal/control/adminapi/api.go

@@ -45,6 +45,8 @@ type API struct {
 	storeStatus func() ([]StoreMember, error)
 	// serve runs registry-to-replica jobs; nil without a mirror and a store.
 	serve *modelserve.Server
+	// history is the Prometheus the console's charts read from.
+	history History
 
 	models   Models
 	capacity Capacity
@@ -135,6 +137,7 @@ func (a *API) Register(mux *http.ServeMux) {
 	mux.HandleFunc("POST /api/v1/models/{name}/rollback", a.rollbackModel)
 	mux.HandleFunc("POST /api/v1/models/{name}/origin", a.setOrigin)
 	mux.HandleFunc("GET /api/v1/plan", a.planModel)
+	mux.HandleFunc("POST /api/v1/metrics/range", a.metricsBatch)
 	mux.HandleFunc("GET /api/v1/requests/{id}", a.request)
 	mux.HandleFunc("POST /api/v1/models/{name}/retry", a.retryModel)
 	mux.HandleFunc("GET /api/v1/models/{name}/headroom", func(w http.ResponseWriter, r *http.Request) {