Intended behaviour for OTEL Baggage

[yatriks]

Hi,

I've followed all the setup suggestions here for setting up a couple of keyvalues for baggage (https://faststream.ag2.ai/latest/getting-started/observability/opentelemetry/baggage/).

However, I'm running into an issue where, despite having BaggageSpanProcessor set up, and seeing the baggage headers in RabbitMQ, I don't see them propagated to spans. I do have the W3C baggage propagator on as well (by using the OTEL_PROPAGATORS envar).

Is the intended behaviour to use CurrentBaggage to manually set up span attributes, or should I expect the span processor to get them from headers correctly?