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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.
And frankly it's a shibboleth for Linux pros. As a newbie in an interview it's fine to say you're "only a beginner with vi/vim" - but very risky to say you hate it and can never remember how to exit.
NOTE:
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Hence, a higher number means a more popular project.