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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.
I highly recommend https://lipu-sona.pona.la to all new learners. It is probably the best resource for learning it
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Hence, a higher number means a more popular project.