Problem / Background

PR #176 standardized NVIDIA GPU Prometheus labels from index/uuid to gpu_index/gpu_uuid across all GPU exporters. However, non-NVIDIA NPU exporters (Tenstorrent, Rebellions, Furiosa, Gaudi, Google TPU) still use the generic index/uuid labels, creating an inconsistent naming convention across the codebase.

Goal

Rename index → npu_index and uuid → npu_uuid (or device-specific prefixes like tpu_index, gaudi_index if preferred) across all NPU exporters, mock templates, parser, and API.md, following the same pattern established for GPUs.

Scope

• Update label names in all NPU exporters (src/api/metrics/)
• Update NPU mock templates (src/mock/templates/)
• Update remote parser to accept both old and new label names (backward compatibility)
• Update API.md metric tables
• Note as a BREAKING change in the changelog

Technical Considerations

• Follow the same backward-compatible parsing pattern used in PR fix: cross-PR review fixes for NVIDIA monitoring features (#172-#175) #176 (.or_else(|| labels.get("uuid")) fallback)
• Coordinate the rename across all NPU families in a single PR