I'm trying to find a question involving GR that I'm positive I read on or around Dec. 22 and wanted to refer back to it but I can't find it now. It asked about an "exact" expression for either gravitational force or gravitational potential energy. It is NOT this one because it was asked after I read the question I'm looking for and none of the answers is the answer to the question I'm looking for. So, have any GR questions been deleted recently?
I presume that you are aware that you can get a tag specific list of questions to sort through by clicking on the tag anywhere you find it or by specifing
[general-relativity] in the search box?
Combining tag search with searching for "exact" might get you closer (and three undeleted and none pending ... we have such a placid site most of the time).
Checking the 10k-tools page for deletions in the last 30 days reveals only three such posts (questions and answers), none of which appear to involve general relativity.
You read the question around Dec. 22 does not mean that this question was asked on this day. If you are using the default "active" view, then it might be asked much earlier than this date. There are many people retagging questions these days, so the old questions pop up often. What you might have seen might be questions being retagged. The retagging is not very professional, so you might not see general-relativity as a tag.
If the questions your read is pretty high level, then it might probably be tagged as