Ask HN: Is there an Android app that pings a server and rings when it's down?

I have an indie SaaS that sometimes goes down. I have statuscake set up, but their emails will not wake me up in the night (DND on). I'd pay for an app that pings my server every 5 min to detect errors. If my app is down, it would check that google is up (to rule out network problem on the device). It would immediately generate a notification. After 3 checks have failed, it would trigger an alarm, even if "do not disturb" is on. I think it would be easy to monetize, just sell the app. Not as a service, just as an app. I've been searching for something like that but couldn't find anything, only comments on other apps that expressed the same need. If anyone knows an app that would do this or wants to program it, please let me know :) my Java skills are not up to date so I can't realistically program it myself.