How to disable ASP HttpRequestIn Activity listeners?

[ogxd]

Hello,

It seems that since recent versions of dotnet, Activities named Microsoft.AspNetCore.Hosting.HttpRequestIn are created when using ASP NET Core. This is a problem for us because we've implemented tracing ourselves a while ago and we don't want automatic instrumentation (it does not fit all of our usecases).

Our ActivityListeners responsible of exporting the Activities (as spans in the context of an opentelemetry collector based pipeline) filter on the source names already to only listen to sources we're interested in, yet however it seems some Activities are generated despite not explicitely listening to them, such as the Microsoft.AspNetCore.Hosting.HttpRequestIn ones. We would have expected Activity.Current to be null in an ASP NET core controller if there is no listener.

I am guessing there is some kind of default listener in ASP NET Core. Is it possible to disable them?

Thanks in advance!

[ogxd]

Hmmm it seems I was wrong, there are no listener by default:

But then I wonder why activity is not null

[ogxd]

Ok I found out, I had to disable a logging source (weird to me that has an impact on tracing, but anyway..).
Here is the place in code where this activity is created despite having no listeners on that source:

aspnetcore/src/Hosting/Hosting/src/Internal/HostingApplicationDiagnostics.cs

Lines 416 to 418 in 6b7a6a9

	if (loggingEnabled || diagnosticListenerActivityCreationEnabled)
	{
	activity = new Activity(ActivityName);

In appsettings.json:

"Logging": {
    "LogLevel": {
        "Microsoft.AspNetCore.Hosting.Diagnostics": "None"
    }
}

This was answered in this issue: #18955.
I didn't need the EventLog section in my case.