Microsoft has updated the built-in tool SetupDiag to version 126.96.36.199 is released with 61 rules. It is included in Windows 10 version 21H1. Also, this version of the tool is now available as a standalone tool in the Download Center.
The new super fast cadence of modern Windows versions and short life cycle has forced users to perform full OS upgrades twice a year. For example, the most recent stable Windows 10 release as of this writing is version 1803, "April 2018 Update". However, we are already expecting version 1809 at the end of this year. To help users perform upgrades smoothly, Microsoft has released a new diagnostic tool, SetupDiag.