Smart. I am under Uptime Robots free tier just to monitor my public DNS and that NPM is up and routing to next cloud and ssh.
I have been using Uptime Kuma for internal monitoring and Uptime Robot for external.
I like the combination and it seems like what you are looking for.
https://github.com/louislam/uptime-kuma https://uptimerobot.com
Whoa. I didn’t know there was an app, I should have guessed! Thanks a lot.