feat(otel): optional OpenTelemetry tracing (ADR-0025)#6
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A new optional babelqueue-go/otel module (its own go.mod, so the core stays zero-dep) that emits produce/consume spans correlated across hops via trace_id<->OTel TraceID: WrapHandler (consumer span) and Publish (producer span). Wired into CI (transport-modules step) and release.yml (otel/v* tag). Envelope untouched (GR-1); opt-in.
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Adds an optional
babelqueue-go/otelmodule — its owngo.mod, so the zero-dependency core never imports OpenTelemetry (GR-7). Implements ADR-0025.What
trace_id↔ OTelTraceIDmapping (a UUID maps to its 16 bytes; otherwise SHA-256). The already-propagatedtrace_idbecomes the shared OTel trace across every hop/SDK — no envelope change (GR-1), no transport change.WrapHandler(tracer, handler)— a CONSUMER spanprocess <urn>in thetrace_id-derived trace, with messaging-semconv attributes + error/status. Mirrors the idempotency/schemaWrapshape.Publish(ctx, tracer, app, urn, data)— a PRODUCER spanpublish <urn>that carries the active trace into the message'strace_id.Tests / CI
-raceclean.ci.yml(transport-modules step, network-free) andrelease.yml(otel/v*tag).go 1.21for full-matrix coverage.Honest limit
One correlated trace per
trace_id; exact cross-hop span parent-child (W3Ctraceparentas a transport header) is the documented follow-up.🤖 Generated with Claude Code