They were PRs that required approval and merge from the Github project maintaine...

fudged71 · on March 2, 2017

It's actually incredibly interesting to read how the developers individually responded to each of these PRs.

It would have been great to see a count of how many PRs have been accepted.

cpeterso · on March 2, 2017

edutechnion's link says 1108 open PRs and 999 closed.

Interesting that 2100 of the PRs are "Upgrade Apache Commons Collections to v3.2.2" and just 7 were "Upgrade Apache Commons Collections to v4.1".

therealdrag0 · on March 2, 2017

Probably v3.2.2 was lower hanging fruit for most projects. Instead of having to make code changes.