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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.
According to the description it "mines" filesystem metadata and keeps it in a local index. If you're still really worried about it (which is completely understandable from a guy with severe trust issues' point of view), you could always have a look at the source code :)
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Hence, a higher number means a more popular project.