Description

Activity source started events on .net framework don't have accurate duration. This appears to be due to the use of DateTime.UtcNow:

In other code paths GetUtcNow() is used to get an accurate timestamp.

This can be observed by durations being 00:00:00.0000001 on .net framework.

Configuration

.net framework 4.8
Windows 10 2004.
x64

Regression?

Not a regression, as activity source is new, but diagnostic source had accurate durations.

Other information

I suspect the only workaround is to provide an accurate timestamp to the calls to StartActivity.