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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.
If you want to check it out, here is the GitHub repo: https://github.com/louislam/uptime-kuma
I "test" a a bunch of free uptime monitoring services by pointing them to my heartbeat monitoring service – I can see when they don't ping my service on the expected schedule (i.e. they have some kind of downtime on their own). Here are the stats for February and March 2023:
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.