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The example uses Dead Man's Snitch, Healthchecks.io is my preference and their plans offer more for less. Both offer code on Github for examination.

https://deadmanssnitch.com/plans vs. https://healthchecks.io/pricing/

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Is there anything self hosted in this space?

Yes, Healthchecks is open-source and can be self-hosted https://github.com/healthchecks/healthchecks

Depending on your environment, i.e. if you have a metrics system in place already, I generally just post a success metric and alert on lack of success metrics.

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