feat: [pubsub] add W3C Baggage support #8048
feat: [pubsub] add W3C Baggage support #8048aris-cub wants to merge 4 commits intogoogleapis:mainfrom
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The telemetry-tracing module only propagates W3C Trace Context (traceparent/tracestate) but not W3C Baggage. This prevents downstream consumers from receiving arbitrary key-value metadata through Pub/Sub messages, which is needed for use cases like message routing and queue splitting. Uses CompositePropagator to combine W3CTraceContextPropagator and W3CBaggagePropagator. No new dependencies required — both are already in @opentelemetry/core.
- Add baggage key to `containsSpanContext` - Use `context.with()` in injection test
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Hi @shivanee-p and @feywind , could you take a look at this when you get a chance? This adds W3C Baggage propagation support for Pub/Sub (related to #8046). I'm happy to address any feedback you might have! |
retain propagation context to prevent dropping baggage - Store context on message and activate for user callbacks. - Rename containsSpanContext to containsPropagationContext. - Update copyright year.
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Hi @pearigee, @hongalex,@feywind and @googleapis/pubsub-team — following up on this PR. We're building Pub/Sub support in mirrord and the companion PR is ready to ship: metalbear-co/mirrord#4164. Mirrord lets developers run a local process as if it were running in their Kubernetes cluster, and uses W3C Baggage ( This PR is the small, additive change that unlocks that integration (linked issue #8046). Thanks for taking a look! |
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add W3C Baggage support
Fixes #8046