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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.
https://jamesoff.github.io/simplemonitor/ - single python script. Can send an email on up or down and generate an html status page. I use it for monitoring services and alerting via email when something goes down.
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Hence, a higher number means a more popular project.