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shenk-bandClaude Fable 5
5ee96019e0
Migrate WeKnora's Langfuse tracing from the legacy /api/public/ingestion batch API to the OpenTelemetry Go SDK emitting OTLP/HTTP to /api/public/otel/v1/traces — the Langfuse v3+ standard ingestion protocol. Why: Langfuse v3 deprecated the legacy ingestion API in favor of OTLP, and OTel-only backends (e.g. the LiteFuse Doris fork) dropped it entirely, so the legacy client was incompatible. Migrating to the OTel SDK also adds W3C traceparent cross-service propagation: an upstream caller's trace id is inherited so its run and the WeKnora call land under one trace in the UI. What: - Manager owns an OTel TracerProvider backed by an otlptracehttp exporter (Basic auth + the x-langfuse-ingestion-version gate header). Spans are buffered by BatchSpanProcessor and exported complete on End, so a long trace no longer fragments across flush batches. - *Trace/*Span/*Generation wrap OTel spans; the public API (StartTrace/ Span/Generation, handles, InjectTracing, asynq/gin middleware, Config, TokenUsage) is unchanged, so callers (agent/chat/handler/scheduler/asynqdl) need no edits. - W3C traceparent: GinMiddleware extracts traceparent from incoming requests; AsynqMiddleware + InjectTracing propagate it across the asynq payload. types.TracingContext gains a LangfuseTraceparent field. - logger.CloneContext preserves the active OTel span across context rebuilds so child spans (agent engine, summary generation) stitch to the HTTP trace instead of orphaning into separate traces. - StartSpan/StartGeneration re-establish the parent from the *Trace handle when the ctx lost the active OTel span, covering background/derived contexts. Compatibility: works with Langfuse v3+ (cloud / self-hosted / the bundled docker-compose profile) and LiteFuse. Drops Langfuse v2 (legacy-only) support. Uses the OTel Go SDK already (indirectly) in go.mod, promoting otlptracehttp to direct; no third-party langfuse-go library. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>