docs: document opt-in HTTP request Prometheus metric#649
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Summary
Documents the new opt-in
http_server_requests_secondsPrometheus histogram that times every HTTP request across the API, scheduler, and NATS worker. The metric is disabled by default and enabled viaLIGHTDASH_PROMETHEUS_EXTENDED_METRICS_ENABLED=true.Changes
LIGHTDASH_PROMETHEUS_EXTENDED_METRICS_ENABLEDto the Prometheus environment variables reference.method,uri,status_code), bucket layout, cardinality safeguards (templated routes,unmatchedsentinel,/assets/*collapsing), and example PromQL queries for p99 latency and 5xx error rate.