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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.
Or better yet self-hosted https://github.com/louislam/uptime-kuma
Try https://app.freshping.io/ instead, think is more reliable than uptimerobot. Or if you can run a custom script (with crontab) https://healthchecks.io/ is the way to go, here's an example script https://gist.github.com/1activegeek/9a932346d85d20123eb3a60d3b03a095
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.