The root of my APFS drive has a lot of "retropds.log.N.log.M.gz" files, each either 0 or 41 bytes in length. When uncompressed it's a 0 byte file. I have about 60 of these plus 6 "retroclient.log.N.gz" files. Owner is root, btw.
(Where "N" is a single digit number, as is "M".)
I'm guessing these are lock semaphores, but does anyone know? Disturbs my sense of esthetics and propriety to have these land in the root of the drive.