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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.
This is the download I used: https://github.com/ProtonVPN/android-app/releases/download/4.5.16.0/ProtonVPN-4.5.16.0.apk
NOTE:
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Hence, a higher number means a more popular project.