I have been trying to get the Diagnostic Source working for the Kestrel Server following the documentation:
https://learn.microsoft.com/en-us/aspnet/core/fundamentals/servers/kestrel/diagnostics?view=aspnetcore-8.0#diagnosticsource

I couldn't figure out why it wasn't working but in searching the AspNetCore source, I came across this pull request for Metrics#46834

In theKestrelServerImpl theDiagnosticSource passed in theServiceContext isnull and not passed in from theKestrelServerImpl constructor callingCreateServiceContext.

TheServiceContext.DiagnosticSource property is referenced inHttpProtocol - which returns null such that the diagnostic event is not written.

I guess my questions are:

Was this intended with the Metrics prototype PR work? If so, what was the decision for removing the diagnostic source events? And if so, can the supporting documentation be updated?

Many thanks!