It says, "Evolution of the number of commits over the last year," but should probably say something like "Evolution of the number of open tickets over the last year."
This was fixed in https://pagure.io/pagure/c/907ba17242490b767c21cec877dd3ad322526ef6?branch=master :)
Thanks for your report though, always appreciated!
Metadata Update from @pingou: - Issue close_status updated to: Fixed - Issue status updated to: Closed (was: Open)