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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.
Not always. Check out how Oracle Cloud does it. It's a hosted version of an open source stack called fn, which you can run fully locally via a simple CLI tool.
https://fnproject.io
NOTE:
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Hence, a higher number means a more popular project.