Thanks for the post and question. WebUI Test Studio no longer officially supports Visual Studio load or web tests, so there is not really any built in metrics we offer.
So you could either create your own load or web tests in VS, or add a custom timer code solution in a code behind file for your WebUI tests. To write to the log, all you would need in code is:
Log.WriteLine("My Test Info");
and the string will be writted to the Log/.TRX file for the test run.
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