xarmian 20fbb45de9 feat: add Prometheus metrics and /metrics endpoint ...

Instrument the Go server with Prometheus metrics for production
monitoring. Adds HTTP request count/duration/size histograms (by
method, route pattern, status), SSE connection gauges per workspace,
event bus publish/subscriber counts, and database connection pool
stats via callback collector. Go runtime metrics included.

The /metrics endpoint is unauthenticated (standard for Prometheus
scraping), separated from the auth middleware via chi router groups.

Resolves TASK-164

2026-04-06 01:13:40 +00:00

..

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feat: add Prometheus metrics and /metrics endpoint

2026-04-06 01:13:40 +00:00