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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.
It is not meant for this, but maybe it works anyway? https://github.com/hay-kot/homebox
To monitor things, the popular ones are Prometheus (pairs well with Grafana), Uptime-Kuma, Healthchecks.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.