I set it to debug at somepoint and forgot maybe? Idk, but why the heck does the default config of the official Docker is to keep all logs, forever, in a single file woth no rotation?
Feels like 101 of log files. Anyway, this explains why my storage recipt grew slowly but unexpectedly.
Or you can use Podman, which integrates nicely with Systemd and also utilizes all the regular system means to deal with log files and so on.