What are my options for getting alerts on my android phone if services on my VPS becoming unresponsive?
My first thought is a simple app that periodically pings domains and gives a notification if any fail. Is there an open source app for that?
Or something else?
Uptime Kuma has a number of notification options.
I just had to set one up because the Oracle free tier is hot garbage and needs resetting every day or two.
Same here. Run it on my VPS to test my outside reachability and inside to check against my VPS.
I use uptime Kuma with signal-cli for notifications - it’s been rock solid. I also have another uptime kuma instance that uses email as notification option to monitor my primary uptime kuma and the signal-cli.
+1 for Uptime Kuma, I use it with ntfy. If OP doesn’t want a self hosted solution, there’s UptimeRobot - essentially SAAS Uptime Kuma, but with a free tier.
This is what I use, though I run it on a local server that checks services that it runs (update breaks something, etc) and then also reaches out to the vps (and more) for status checks. Have it check services that are accessible by an access control rule, so the server is protected but you have updates on exactly what is having issues.