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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.
Personally a big fan of ipfixcol2, which allows me to dump collected packets straight into a queue, and allows me to ingest wonky custom fields that some of my vendors insist on using and not documenting.
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Hence, a higher number means a more popular project.