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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.
Using nix for a package or two should be fine on Gentoo. I used https://github.com/trofi/nix-guix-gentoo for a few years for firefox, ghc, new glibc and gcc before switching to NixOS. I never needed root privileges (aside from emerge updating sys-apps/nix itself).
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.