Merge pull request #4277 from evhen14/trace-info-propagation

Propagate trace inforation from incoming headers

Author: hhunter-ms

daprdocs/content/en/operations/observability/tracing/tracing-overview.md

@@ -63,7 +63,7 @@ You must propagate the headers from `service A` to `service B`. For example: `In
 
 ##### Pub/sub messages
 
-Dapr generates the trace headers in the published message topic. These trace headers are propagated to any services listening on that topic.
+Dapr generates the trace headers in the published message topic. For `rawPayload` messages, it is possible to specify the `traceparent` header to propagate the tracing information. These trace headers are propagated to any services listening on that topic.
 
 #### Propagating multiple different service calls