Monit and Pushover - $5 and I was done [1]. Since implementing this I have had only one problem [2]. The great thing is the servers just fix themselves and I don't have to do anything - this is really nice since I am the person on call.<p>1. <a href="https://www.tillett.info/2016/07/19/dead-simple-centos-server-monitoring-with-monit-and-pushover/" rel="nofollow">https://www.tillett.info/2016/07/19/dead-simple-centos-serve...</a><p>2. There really wasn't any problem I had just set the resource utilisation value too low so I got a false positive.
I use <a href="https://attomon.com" rel="nofollow">https://attomon.com</a> (disclaimer: I'm the creator)<p>I'm also interested in hearing what you like and don't like about your current website monitoring solution.
I use <a href="https://apex.sh/ping" rel="nofollow">https://apex.sh/ping</a>. Works well for the low monthly price, just wish it had better incident reporting.