[SRE-004] 4 Prometheus metrics missing cryptofunk_ namespace prefix

[ajitpratap0]

rate_limiter_requests_total, rate_limiter_blocked_total, websocket_connections, and backtest_jobs_total lack the required cryptofunk_ prefix — will conflict with other exporters.

Evidence:

internal/metrics/ and cmd/api/ show metric registrations without namespace prefix

File: internal/metrics/metrics.go:~1
Agent: SRE-004

[ajitpratap0]

Stale. Grep across the repo for rate_limiter_requests_total / rate_limiter_blocked_total / websocket_connections / backtest_jobs_total returns zero matches — those metrics no longer exist (renamed or removed). Existing metrics already use the cryptofunk_ prefix (see README.md:498-501 and deployments/prometheus/alerts/*).