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Show hostname in GPU legends for Grafana dashboard (#630); add doc #648

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Show hostname in GPU legends for Grafana dashboard (#630); add doc #648

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13 changes: 13 additions & 0 deletions grafana/HOSTNAME_LEGEND_UPDATE.md
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# Dashboard Update: Hostname in GPU Legends

The Grafana dashboard now displays the hostname in all GPU graph legends (e.g., "GPU 0 on myhost").

**How it works:**
- The `legendFormat` for each GPU panel now includes `{{hostname}}`.
- This helps distinguish metrics from GPUs with the same number on different hosts.

**No changes are needed to your Prometheus queries or exporters if you already have the `hostname` label in your metrics.**

---

_This change addresses: https://github.com/NVIDIA/dcgm-exporter/issues/630_
8 changes: 4 additions & 4 deletions grafana/dcgm-exporter-dashboard.json
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Expand Up @@ -245,7 +245,7 @@
{
"expr": "DCGM_FI_DEV_POWER_USAGE{instance=~\"$instance\", gpu=~\"$gpu\"}",
"interval": "",
"legendFormat": "GPU {{gpu}}",
"legendFormat": "GPU {{gpu}} on {{hostname}}",
"refId": "A"
}
],
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"format": "time_series",
"interval": "",
"intervalFactor": 1,
"legendFormat": "GPU {{gpu}}",
"legendFormat": "GPU {{gpu}} on {{hostname}}",
"refId": "A"
}
],
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{
"expr": "DCGM_FI_DEV_GPU_UTIL{instance=~\"$instance\", gpu=~\"$gpu\"}",
"interval": "",
"legendFormat": "GPU {{gpu}}",
"legendFormat": "GPU {{gpu}} on {{hostname}}",
"refId": "A"
}
],
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{
"expr": "DCGM_FI_DEV_FB_USED{instance=~\"$instance\", gpu=~\"$gpu\"}",
"interval": "",
"legendFormat": "GPU {{gpu}}",
"legendFormat": "GPU {{gpu}} on {{hostname}}",
"refId": "A"
}
],
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