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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.
Rust isn't a fully functional language, but the functional features play well with the lifetime system and are optimized well.
(Rust playground example: https://play.rust-lang.org/?version=stable&mode=debug&editio...)
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Hence, a higher number means a more popular project.