How to Check Site Downtime Using Bash and Cron Job
Get a Ubuntu VPS Server, use this link, so you get free $100 Digital Ocean credit.
Install Golang on your Ubuntu VPS Server: https://linuxize.com/post/how-to-install-go-on-ubuntu-20-04/
Install notify; https://github.com/projectdiscovery/notify#installation-instructions
Source Code for Uptime Checker Bash Script: https://gist.github.com/saintmalik/b10aa014a8f37365cadaf9e86db8a612