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Healthchecks
Open-source cron job and background task monitoring service, written in Python & Django
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
And here I am of course thinking of Healthchecks.io, but there are good alternatives too. The monitoring service provides an unique URL that the housekeeping script must request regularly. When an HTTP request from the script does not arrive on time, Healthchecks.io detects that and alerts you. This takes care of scenarios, where, for example, the server has been shut down, and so is unable to contact you by itself. Healthchecks.io offers a lot more features, but this is the basic idea.