i mentioned in another post: github "glorifies" the person and the changes that they make. "look at mee! look at mee! i'm making a commit! i'm wiping my backside now! aren't i great!" which gets you precisely zip in terms of actual strategic value.
changes measure change.
people will tell you - if you let them - by providing you with the information needed to make a qualitative assessment.
so.
provide a type of wiki/website that allows qualitative assessments to be made, on a per-library / per-project basis. then put the metrics (the "criticality value") onto that.
pre-seed that wiki/website with stuff from github if you feel so inclined but DO NOT limit the wiki/website to exclusively github. i repeat again: doing so would be a disastrous mistake.