This task is a followup to T212904: Create a Tech Contributors Map to document major audiences and their goals.
This task is related to T237470: Create and maintain somehow a list of repos mastered in GitHub (and in Phabricator Diffusion) when it comes to the "Diffusion" part in its task summary.
We seem to have >300 repositories which use Phabricator Diffusion as a canonical place. As far as I know, we do not have stats how much development activity happens in these repos.
First question is probably: How to differentiate which commits were not "imported" but are canonical in Diffusion?