Anyway, the TL;DR is: Create an endpoint, and if your script/cronjob fails to regularly ping it, you get notified (by email or ntfy). E.g.:
0 * * * * ./script.sh && curl -fsS https://sigabrt.dev/pulse/<id>/beat
It also has an SSH TUI which is currently experimental and read-only, mostly because I'm not sure whether it is actually useful or just a gimmick :): ssh sigabrt.dev
To use it, simply add your SSH public key in your account settings.Yes, there are services like this already, and this is minimalistic by comparison. Feedback is welcome.