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there is a significant number of unowned files on the servers. this is generally because a user was removed without the associated user being purged as well, but there are also odd corner cases like backup restores and so on.

In #29682 (moved), I have done the following Cumin run to find such files, expecting to find only problems with the Munin user/group I had just removed, but instead found many more cases, mostly (300,000) surrounding deleted users:

cumin -p 0 -b 5 --force -o txt '*' 'find / -ignore_readdir_race -path /proc -prune -nouser -o -nogroup' | tee unowned-files

Next step is to decide what to do with the leftover files and document this as part of the user retirement process.