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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.
In Android apps, that's how it works.
The SDK (recommended for login) is set up by default to collect information and installs handlers for app lifecycle events as soon as the app is installed. The default is to do this without requesting user consent.
A rough summary of the data: (Ad ID, device, locale, phone network, maybe install referrer)
https://github.com/facebook/facebook-android-sdk/blob/fcd4ef...
https://github.com/facebook/facebook-android-sdk/blob/5fe6e2...
https://developers.facebook.com/docs/app-events/getting-star...
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.