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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 doesn't officially support the 3.x software yet but you might want to keep an eye on https://github.com/ddvk/remarkable-hacks if you're looking to augment the software (especially if your rM2 still has the 2.15 software)
NOTE:
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Hence, a higher number means a more popular project.