This isn’t really a Discourse issue, but I’ve decided that it’s time that I have something more formal in place to know when a site is down than to happen to notice or get an email from someone.
I’ve seen pingdom and uptimerobot.
Well, and here’s this: The Best Website Monitoring Services | PCMag. But most of those cost 10-100x what would make sense for me. See also https://www.capterra.com/website-monitoring-software/ for a list that seems too long to be useful; well, you can filter by various factors.
There’s also Newrelic plugin and GitHub - davidcelis/new_relic-discourse: A New Relic plugin for Discourse forums. · GitHub.
And https://www.infoworld.com/article/2683857/network-monitoring/article.html. . .