Show HN: Pong – Basic uptime monitoring with email alerts

I've been using the free plan on Pingdom for a long time, and it's a great service! They've recently decided to scrap the paid plan however:

https://venturebeat.com/2019/01/07/pingdom-will-kill-its-fre...

I can totally understand the move, and if my personal needs were greater, I'd gladly have converted to a paid account. Basically I just want an email if one of my hobby projects goes down. Nothing much more.

I already pay for a server, so I decided to put together a minimal Rails app that gets me 95% of the way instead of hunting for another free provider.

For now there's no auth etc. It's bare bones, but batteries included. All you need to run your own instance, is a host running docker.