I agree that there are a ton of non-code related things that a project leader should be doing, but the vast majority should be visible in some way. Mailing list

I agree that there are a ton of non-code related things that a project leader should be doing, but the vast majority should be visible in some way. Mailing list discussions, roadmaps, code reviews, creating/triaging issues, etc. It should be pretty easy to get a representative picture of what a project leader did over a whole year.