Contribution analytics "Avg m"

Hi everyone,

I have a question about a mysterious “Avg m” on gitlab.com.
In the contribution analytics page of an arbitrary project, you will find boxes showing each contributor’s commits over time if you scroll down a bit.
Below these boxes, for each, is “Commits Avg: XXXm · Max: Y”.
I cannot find any documentation or mention of this “Avg m”, not by existing posts nor GitLab itself.

I hope I am not missing something obvious ^^