Why does the late-answer review queue sometimes spike in size by over 5000?
I just reviewed an answer on the Late Answers queue, and after flagging as "not an answer" and leaving a comment on it (which I just deleted), I realized it's from almost three years ago.
It is a late answer, as the question is two months older, but it struck me as odd to see it just pop into the review queue now. If multiple similar answers appeared in the queue at the same time, I'd think it was some change to the algorithm, or a scheduled task. But a single answer? What was it doing there?
I just saw another one. So maybe that's the default behavior of the late answers queue, and I hadn't noticed it?