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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 maintain https://github.com/steev/linux/tree/linux-5.16.y which does include the battery (and a lot of testing patches for upstreaming. There are other branches as well, of course, though I tend to follow mostly the top of stable.
NOTE:
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Hence, a higher number means a more popular project.