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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.
If you really wish to know about Linux, search for LPI, the kernel, GNU commands, security issues, your own package manager, and of course a TEAM.
You can use Debian, Fedora, Arch, Gentoo, of LFS as a base. (chronologically it becomes harder)
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.