@Ooker I think it's relevant to bring this up, but in SE parlance, it's
too broad without specifying
which diversity you are after. :) One relevant one I can think of is in terms of
scope. We set out to include a given set of topics on this site, it would be informative to see percentages of how well each are represented/how active they are, and the quality of contributions to each topic/subtopic.