I’ve just set up Uptime Kuma in HA.
I was using it to get email notifications but it was just an endless barrage! I figured that instead of hearing the instant my pi (in my bedroom) can’t see my server (in my kitchen 4 floors below connected by power line) I’d make HA send me notifications when something is down for 5 minutes instead.
I only get emails if HA is down now, and barely hear anything from anything else anymore.
I run everything on my server and have my Pi for Kuma and a backup adguard just to keep em separate.
I’m gonna assume you’re not using Home Assistant yet.
There is an app for Home Assistant but from your comment I’m assuming you’re talking about something like Smart Life.
Home Assistant takes all these different companies and creates a central hub for them all. So we have Hue bulbs and Nest cameras all talking to each other via Home Assistant.
If you’re already using Home Assistant then disregard and have look into PIR and Mm Wave sensor.
I’ve moved up a level and recently made a bed sensor.