DCGM exporter v3.x emits lowercase metric names (dcgm_gpu_utilization)
but dashboards used the old uppercase format (DCGM_FI_DEV_GPU_UTIL).
Fixed across 4 dashboard files:
- foxhunt-cockpit.json (Infrastructure Cockpit)
- foxhunt-training-cockpit.json (Training Cockpit)
- foxhunt-gpu-training.json (GPU Training)
- gpu-overview.json (GPU Overview)
Replaced DCGM_FI_DEV_FB_TOTAL with (dcgm_fb_used + dcgm_fb_free)
since DCGM v3 doesn't emit a total metric.
Redeployed all dashboard ConfigMaps and restarted Grafana.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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