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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.
to be fair, wikis are documentations more suited for teaching the basics than man and https://systemd.io/ are. I agree across all init systems, and all of Linux, that docs could be better.
NOTE:
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Hence, a higher number means a more popular project.