Document all metrics emmited by kai services #902
Description
What you would like to be added?
Scan the codebase for all registered Prometheus metrics (e.g., NewCounter, NewGauge, NewHistogram) and add a docs/METRICS.md document with all the data.
The document should contain a table with the following columns:
- Metric Name
- Type (Counter/Gauge/Histogram)
- Labels (if applicable)
- Description (and relevant labels if applicable)
Why is this needed?
Metrics documentation is important.