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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.
I am not sure if you know boxxy: it is a handy tool that uses linux userspace namespaces to wrap requests for a file to a proper (configurable) location.
NOTE:
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Hence, a higher number means a more popular project.