The idea is to develop charts which show informative information about developer activity. It would look like this https://weechat.org/dev/stats/ It would be built using this https://github.com/flashcode/gitchart Ideally, this would be setup on one of the projects servers so that it can autorun to stay updated, and have a static url for viewing.
Much of this information can be viewed graphically on github itself. Each repository has a graphs tab - here is the one for dcrd: https://github.com/decred/dcrd/graphs/contributors
That one looks a bit fancier to me https://forum.decred.org/threads/decred-is-free-and-open-source-software.462/page-3