> ...3) I would put a file in any auto-cleaned space named "1-AUTOCLEAN.txt" > that contains some verbage explaining that things in this directory will be > wiped based on rules set in (wherever).
You know, that's a pretty good idea! Put a 00README-TMP.txt in /tmp/ and /var/tmp/ which briefly states the default deletion policy, the policy in place if it's not the default, and a pointer to info about altering it. "/tmp's contents are deleted at boot while /var/tmp is preserved across rebooting." Maybe in /var/tmp suggest /var/scratch/ or /var/cache/tmp or such as a place sysadmins might want to set up for not-backed-up but not-auto-deleted material. If the contents aren't dynamic, maybe they could be links to files in /usr/share/doc/systemd/.
