.NET CaptureBlockingCalls external code

[btecu]

It looks like CaptureBlockingCalls = true also reports on external code (ASP .NET Core, nuget packages), which is really not actionable:

Is there a way to only capture local code?
Using .NET 9.

[jamescrosswell]

Hi @btecu ,

The only way to selectively capture blocking calls at the moment is by suppressing it for certain code blocks:

sentry-dotnet/samples/Sentry.Samples.AspNetCore.Mvc/Controllers/HomeController.cs

Lines 45 to 48 in d1e5efc

	using (new SuppressBlockingDetection())
	{
	Task.Delay(10).Wait(); // This is blocking but won't trigger an event, due to suppression
	}

Does that help in your situation?

[btecu]

It doesn't, that's not really feasible, is it? Can't edit external packages code which is already compiled anyway to add SupressBlockingDetection.

[jamescrosswell]

It doesn't, that's not really feasible, is it? Can't edit external packages code which is already compiled anyway to add SupressBlockingDetection.

It depends whether you're calling the code in the external package explicitly or not. Task.Delay, for example, is from an external package (well, technically from the runtime but it's certainly not my code).

So my question was whether you're seeing blocking calls in external code that is ultimately invoked indirectly by your code or whether that code just "magically" gets run by the framework (which is probably the case for lots of middleware in ASP.NET Core).

[btecu]

If it was caused by internal code, there would be a line at the beginning of the stack trace where it references the call to say Task.Delay, wouldn't?