- New Metrics settings tab with enable/disable toggle
- PrometheusController for wp_prometheus_collect_metrics hook
- License gauges: total by status, lifetime, expiring, expiring soon
- Download gauges: total downloads, active versions
- API counters: requests, rate limits, validation errors
- Metric tracking in RestApiController and UpdateController
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
