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Healthchecks
Open-source cron job and background task monitoring service, written in Python & Django
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As for any specific tool or service to help you with this, it's totally up to you. Popular solutions include Dead Man's Snitch , Cronitor and Healthchecks.io with the last one being available as open-source in addition to their managed offering. But in reality, you could very well hack something together yourself that would do the job just fine. The important part here is that it needs to serve as a dead man's switch, immediately firing and alerting if your alerting tool fails to check in.