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Go backend: - Add OTel SDK + otelhttp middleware deps (go.mod) - New internal/otelsetup package: init OTLP/HTTP TracerProvider from env vars - cmd/backend/main.go: call otelsetup.Init() after logger + ctx setup - internal/backend/server.go: wrap mux with otelhttp.NewHandler() before sentryhttp, so all HTTP spans are recorded SvelteKit UI: - Add @opentelemetry/sdk-node, exporter-trace-otlp-http, resources, semantic-conventions - hooks.server.ts: init NodeSDK when OTEL_EXPORTER_OTLP_ENDPOINT is set; graceful shutdown on SIGTERM/SIGINT Config: - docker-compose.yml: pass OTEL_EXPORTER_OTLP_ENDPOINT + OTEL_SERVICE_NAME to backend, runner, and ui services - homelab/docker-compose.yml: fix runner OTel endpoint to HTTP port 4318 - Doppler prd: OTEL_EXPORTER_OTLP_ENDPOINT=https://otel.libnovel.cc - Doppler prd_homelab: OTEL_EXPORTER_OTLP_ENDPOINT=http://otel-collector:4318 All services no-op gracefully when the env var is unset (local dev).