Will your PR get merged?
merge-chance.info
merge-chance.info
In fairness a decent chunk of the rejected PRs are low effort / not acceptable things.
EDIT: Ah a more plausible reason, it seems the PRs get merged at googlesource and the bot closes them on github
recent submission of an example with a bunch of discussion about the approach: https://news.ycombinator.com/item?id=25719116