Comment by fanatic2pope

I have a home server that is on 24x7 protected by a UPS. The UPS monitoring daemon (nut) provides a hook for calling a script when its status changes, so I have it push a high priority notification to my phone via ntfy whenever it goes on battery or off battery. I also have it broadcast on mqtt so that in the future I can have a dedicated daemon that will collect stats and take other actions that aren't really appropriate for a hook script.