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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 also want to self-host the control server (which is closed source afaik) there is headscale, which is a open-source implementation for that (https://github.com/juanfont/headscale)
NOTE:
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Hence, a higher number means a more popular project.