How much of each GPU works, beside whether anything does

The busy figure is nvidia-smi's utilization.gpu: the share of time any
kernel ran, which a kernel on one SM fills. On cuda01 decode read 92% busy
while the SMs had work 69% of the time and issued on 18% of their cycles.

Busy is now said to be that, and beside it: each card's draw against its
power limit (efficiency table, fleet and node charts, the console's GPU
work chart), and where the profiling counters can be read, SMs active, SM
occupancy, tensor cores and DRAM (llmgw_gpu_*_active_percent), from NVML's
GPM on Hopper and later or a dcgm-exporter on the node
(discovery.dcgm_exporter). The GPU map colours by work by default and keeps
busy as a mode. A MIG instance is never published with its card's profile.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

docs/reference.md

@@ -234,6 +234,7 @@ rather than repeated.
 | `ib_root` | `string` | [Options](#options) |
 | `prefer_nvml` | `bool` | [Options](#options) |
 | `skip_gpus` | `bool` | [Options](#options) |
+| `dcgm_exporter` | `string` | [Options](#options) |
 | `repo` | `string` | [Origin](#origin) |
 | `revision` | `string` | [Origin](#origin) |
 | `files` | `[]OriginFile` | [Origin](#origin) |
@@ -2182,6 +2183,15 @@ is used, is the more exact source of the peers.
 SkipGPUs omits GPU discovery. A node without nvidia-smi is already
 found to have none, so this is for one whose driver is broken.
 
+### `dcgm_exporter`
+
+`string`
+
+DCGMExporter is the dcgm-exporter metrics URL read for how much of
+each card's chip is in use, on cards NVML's GPM does not cover (before
+Hopper). Empty is http://127.0.0.1:9400/metrics; "off" reads none. A
+node without one costs a refused connection every five minutes.
+
 ## Origin
 
 ### `repo`