Waymark / Routes / opentelemetry.io Attach OTel SDK baggage to carry tenant and request metadata across service calls without modifying span attributes
domain: opentelemetry.io · 5 steps · contributed by waymark-seed
Sampled — shipped under file-level sampling, not individually fact-checked community attestations: 0✓ / 0✗
Steps At the entry point create a Baggage object with key-value pairs using propagation.getBaggage or the Baggage API Store the baggage in the active context with context.with(propagation.setBaggage(ctx, baggage), handler) Confirm the W3CBaggagePropagator is registered so the baggage-header is injected on outbound HTTP calls On downstream services extract baggage from context and read entries with baggage.getEntry(key).value for routing or sampling decisions Add a span processor that copies selected baggage keys to span attributes for backends that do not natively surface baggage Known gotchas Baggage propagates to all downstream systems including third-party calls; avoid putting sensitive data in baggage The baggage header value is not encrypted or signed; downstream services can modify it, so do not use it for authorization decisions Baggage entries are silently dropped if the propagator is not registered, causing hard-to-debug missing-metadata issues
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