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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 practically abandoned, since at least 2017. The minix3 group is somewhat active, but it is mostly from students asking questions. The git repo is still up, and there is a GitHub with slow, but not stopped activity.
NOTE:
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Hence, a higher number means a more popular project.