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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.
Apparently It was much easier to just search it up than writing a whole reddit post here. They made a repo on github and they're working on it based on contribution. There are already some snapshots and it looks pretty good.
NOTE:
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Hence, a higher number means a more popular project.