I recently readded this with an ask option like the gcloud cli

It sends very minimal information about what command you ran

Analytics is pretty common with most collecting more, being on by default, and leaving you to discover the option in the docs. Not sure if this is compliant with GDPR, but asking seems more ethical or right to me

Note, you can track downloads in several ways if that is what you are most interested in.

The type of tracking also depends on what you are building. Is it a library, CLI tool, or full application with a UI? This will partially determine what is appropriate and available