I was just thinking last night about setting up an agent that would daily check in and do a full maintenance scan on a server or a home lab box. Check for operating system upgrades. Schedule them if needed to move from LTS to LTS. Check for CVEs against daemons you know you're running. Stuff like that. I've used agents and harnesses to set up machines before and do system administration tasks, but it feels like you could sort of set it up in a loop and just let it go forever.