Collecting traces while reproducing an issue is one of the best methods we have of determining the source of an issue. Microsoft engineers might ask for this information when you open an incident, or you may want to perform tracing on your own for review. Cheng wrote the original article that walks you through the process step-by-step. With the growing number of Windows Core installations a colleague of mine (MikeB) found that new instructions were needed to perform this same process. Bookmark his post. It's one for the toolbox.
How to capture a Dbgview trace from Windows Core