[ASP.NET Core] .NET7+ ActivitySource selection logic

[CodeBlanch]

Today if we detect .NET 7 or greater we resolve the ActivitySource to listen to using the IServiceProvider. This is to mirror what ASP.NET Core does under the hood. See: AddAspNetCoreInstrumentationSources.

@noahfalk Left a comment suggesting that we just listen to the default source by name.

Opening this issue to track the discussion further.

[DrEsteban]

Is there any progress on this issue?

I happened to notice this implementation while writing my app. In my case, I am planning on registering an ActivitySource singleton that the rest of my business logic will use to create child spans. But looking at this implementation, I fear it might screw up OpenTelemetry's ability to collect the tracing information provided by ASP.NET Core.

Were you ever able to determine whether the current behavior is the right thing to do? Otherwise, I'll need to call .AddSource("Microsoft.AspNetCore") myself in my app.