Update power attribution docs for v0.10+ rewrite

[nikimanoledaki]

Problem

The power attribution guide describes the correct ratio formula but is missing some changes from the v0.10+ re-architecture.

Next steps

Update docs with the following:

• Remove eBPF references. Kepler reads /proc and /sys.
• RAPL zones are discovered dynamically, not hardcoded
• Document GPU power attribution via NVIDIA NVML
• Document HWMon and Redfish BMC platform power sources
• Clarify that the kepler-model-server / trained ML model does not yet integrate with the rewrite
• Update any code structure references from pkg/sensors/ to internal/monitor/

Related: sustainable-computing-io/kepler#2219

[nikimanoledaki]

@vimalk78 @sunya-ch since you are active maintainers + have the most knowledge on this, could you help to share context please?

[iacker]

I'd like to take this one 🙋

I recently synced the developer-facing GPU power-monitoring design doc in the core repo (sustainable-computing-io/kepler#2498), so I'm familiar with the v0.10+ collector internals. I'll update the power-attribution guide to cover:

• RAPL zones discovered dynamically (not hardcoded)
• GPU power attribution via NVIDIA NVML
• HWMon and Redfish BMC platform power sources
• A note that the trained kepler-model-server does not yet integrate with the rewrite
• Confirm /proc + /sys reads (no eBPF) and internal/monitor/ code references

Will keep it scoped and reviewable.