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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.
Yes, it's behind a flag and only in future versions, but it is a huge step forward. Those versions will soon be available, and we can try it locally (unfortunately, not on production without a polyfill or a plugin).
NOTE:
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Hence, a higher number means a more popular project.