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The monthly “Google System Release Notes” primarily detail what’s new in Play services, Play Store, and Play system update across Android phones/tablets, Wear OS, Google/Android TV, Auto, and PC. Some features apply to end users, while others are aimed at developers.
The following first-party apps comprise the “Google System”:
Adaptive Connectivity Services: Search the “All apps” list in Settings and open App info for the version number
Android System Intelligence: App info
Android TV Core Services
Android WebView: App info
Device Health Services: App info
Settings Services: App info
Google Play Store: App info
Google Play system update: Settings > About phone > Android version
SIM Manager: App info
A feature appearing in the changelog does not mean it’s widely available. Some capabilities take months to fully launch.
[Phone] General bug fixes and reliability improvements.
[Phone] In a new page on Google Play, you’ll be able to find trending media and entertainment content and where to watch them.
[Phone] With this feature, you’ll be able to sign up for Google Play’s subscription tiered discounts program and easily check your subscription discount status on the details page and home page of eligible apps.