What is the name of the systemd unit that regularly triggers the cleanup of temporary files?

The name of the systemd unit responsible for regularly triggering the cleanup of temporary files is indeed systemd-tmpfiles-clean.timer. This timer works in conjunction with the systemd-tmpfiles-clean.service, which executes the actual cleanup process.

Systemd-tmpfiles handles the management of temporary files and directories in accordance with the configuration specified in the tmpfiles.d directory. The timer unit schedules the cleanup tasks to run at specified intervals, ensuring that old and unnecessary temporary files are routinely removed from the system. This helps maintain system performance and prevents the accumulation of unwanted clutter in temporary file locations.

Other options may refer to services or timers that do not have the same designated function or naming conventions established by the systemd system. For instance, while tmpfile-cleanup.service might suggest a related function, it does not align with the standard naming conventions or provide the same systematic approach to regular cleanup that systemd-tmpfiles-clean.timer does.