feat(observability): OpenTelemetry golden-signals middleware#998

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feat/otel-golden-signals-middleware

Commits on May 11, 2026

docs(spec): OpenTelemetry golden-signals middleware design

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docs(plan): OpenTelemetry golden-signals middleware implementation plan

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build: add opentelemetry deps to workspace
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build: enable tokio_unstable workspace-wide
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build(service_utils): enable opentelemetry deps

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feat(observability): module skeleton
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feat(observability): config from env

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feat(observability): http method normalization
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feat(observability): MeterProvider with prometheus exporter

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feat(observability): route template extraction helper

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feat(observability): build OTel attributes for HTTP metrics
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feat(observability): RAII guard for active_requests gauge

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feat(observability): MetricsMiddleware records HTTP signals
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feat(observability): /healthz /livez /readyz handlers
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feat(observability): /metrics server on dedicated port
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feat(observability): db + redis pool saturation gauges

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feat(observability): tokio runtime saturation gauges
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feat: exclude /healthz /livez /readyz from auth checks
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feat: wire observability into main binary

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test(observability): end-to-end integration
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test(observability): cardinality regression budget
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docs: note metrics endpoints and tokio_unstable build flag

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fix(observability): graceful degradation on init failure (review fix 1)

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fix(observability): __static__ sentinel, extract_route_from_response, production wiring (review fixes 2 + 6)

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fix(observability): merge OTEL_RESOURCE_ATTRIBUTES; document OTLP env var handling (review fixes 4 + 5)

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docs(README): drop spec link from observability section

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fix(observability): graceful OTLP degradation + gRPC protocol warning (items 1 & 3)

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chore(deps): drop opentelemetry-semantic-conventions dep (item 2)

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chore(observability): remove dead code stubs (items 4, 5, 6)

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fix(observability): expose redis.client.connections.connected gauge (item 7)

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refactor(observability): inject env source into ObservabilityConfig::from_env (item 8)

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Commits on May 12, 2026

fix(observability): mount health endpoints without empty-prefix scope

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Commits on May 14, 2026

Commits on May 15, 2026

refactor(observability): DRY env key names with FromStr-based parse helper

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Commits on May 16, 2026

Commits on May 18, 2026

test(observability): move tokio-runtime check to integration test

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