Fair enough. I wouldn't consider having a clone of the repo to be a blocker. You could very easily automate the cloning, reporting, deleting of a repo.
That's true. A big advantage of this solution over, let's say a self written post-commit hook, is the past. It doesn't matter when you start collecting this data, thanks to Git you will have data about yourself from the past. With a post-commit hook that's not the case.
I'm still not sure what's the best way to go, but thanks for your comments!
I'm still not sure what's the best way to go, but thanks for your comments!