Allow users to ignore specific UnobservedTaskExceptions

[i3arnon]

Sometimes you encounter UnobservedTaskExceptions that are outside of your control (e.g. in third-party libraries or in the framework itself).
Currently you can either have them mixed in with the fixable UnobservedTaskExceptions which lowers signal-to-noise ratio, or you must remove the entire UnobservedExceptionTelemetryModule.

It would be useful to have some way to ignore specific UnobservedTaskExceptions without throwing the baby with the bathwater.

[SergeyKanzhelev]

Can you please also provide a code example on how you propose to ignore some of them.

[i3arnon]

You can ignore them by subscribing to TaskScheduler.UnobservedTaskException and marking them as observed.

For example this ignores all ObjectDisposedException and exceptions coming from UdpClient.EndReceive:

void HandleUnobservedTaskException(object sender, UnobservedTaskExceptionEventArgs eventArgs)
{
    var exception = eventArgs.Exception.InnerException;
    if (exception is ObjectDisposedException ||
        exception?.TargetSite == typeof(UdpClient).GetMethod(nameof(UdpClient.EndReceive)))
    {
        eventArgs.SetObserved();
    }
}