Google talks beta-testing on the Play Store, announces “Early Access” feature

Additionally, developers will get a set of very helpful aggregator tools, which show them how many devices their apps are stable / unstable across, and Google's Firebase Test Lab will automatically send the devs screenshots of their app, running on different devices, Android builds, and language settings, so they can hunt for layout issues across the board.

Stability statistics for developers
source: Android Developers
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