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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.
for what I can see — I just questioned myself about it — they don't collect IP and cookies together that can trace personal data (like username or other sensitive data). Even for telemetry they explicitly declare that all data are anonymous (https://github.com/mapbox/mapbox-navigation-android/issues/963 + https://www.mapbox.com/telemetry/).
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