Trace Context not propagated unless source for Microsoft.Orleans.* has been added

[mkstephenson]

I have been playing around with OpenTelemetry tracing and Orleans and found that unless you instruct the OpenTelemetry SDK to listen to the trace source "Microsoft.Orleans.*" (well, I have a * there, I'm sure you can have a more precise name there), the parent activity is not propagated to child activities across Orleans calls and remains null. This means that you can't choose to "just" instrument your own code, you must also add the Orleans source if you wish to have connected spans in Open Telemetry.

I am not sure if this is by design or not, but if it was, I wasn't able to find anything in the documentation related to this caveat. Would it be possible to add a note to the documentation if this is intended behaviour?

I am using 8.2.0 of the Microsoft.Orleans.Server package for reference and starting the application/tracing through an Aspire project.