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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.
Not necessarily. There are many specific utilities used in phases that have to be written in the same language (well, they don't have to, but that's probably the simplest thing they could come up with for Nix).
You mean Nonguix? It's existed for quite a while already and works very well. Just a few months ago it even got an official substitute (AKA "prebuilt-binary package repo" server!
There's also a community image (iso) of it made by System Crafters here.
NOTE:
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Hence, a higher number means a more popular project.