There's also https://healthchecks.io/
alternatives listed here: https://github.com/awesome-foss/awesome-sysadmin/#status-pages
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There's also https://healthchecks.io/
alternatives listed here: https://github.com/awesome-foss/awesome-sysadmin/#status-pages
And a key difference I did not appreciate at the time (as I was just looking at pinging sites for uptime), is that Healthchecks.io can also be used to monitor sites that go down where they have no publicly accessible website to ping, because it acts as a dead man's switch if not reporting in.
yeah, you can use healthchecks with multiple systems in addition to the curl "pings", e.g. Prometheus.