[GA4] Device ID

A browser-based or mobile-app-based identifier for a unique, pseudonymous website or mobile app user.

On a website, device ID gets its value from the client ID property of the _ga cookie. In an iOS or Firebase app, device ID gets its value from the app-instance ID, which identifies a unique installation of the app. Currently, there is no character limit for the client ID, app-instance ID, and the resulting device ID.

Device ID is one of the available reporting identity spaces.

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