IMO "bugs per commit" is even worse than that, because, in addition to what you say, it also hides the extraordinary spike of commit activity of a project that had previously been stable. [0]
It is the exact metric you'd choose if you wanted to make the current situation of rsync look like not a big deal.
It is the exact metric you'd choose if you wanted to make the current situation of rsync look like not a big deal.
[0] https://github.com/RsyncProject/rsync/graphs/commit-activity