feat(observability): add telemetry toggles, trace sampling, metrics auth#99
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memplethee-lab merged 1 commit intoJul 19, 2026
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- Add TRACING_ENABLED master switch and OTEL_TRACES_SAMPLER_RATIO head-based sampling (ParentBased/TraceIdRatioBased) in tracing config - Protect /observability/metrics with optional METRICS_AUTH_TOKEN using constant-time comparison (bearer header or query token) - Fix docker-compose Prometheus mount path and add Grafana datasource + dashboard provisioning for auto-loading - Document setup in docs/monitoring.md and env example files - Add tracing sampler tests and metrics token-auth tests
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Closes #98