Indicates the view selected by the user. The output data will correspond to the selected view

USER_COHORT_UNSPECIFIED Unspecified User cohort. This will automatically choose the default value.
OS_PUBLIC This is default view. Contains data from public released android versions only.
OS_BETA This is the view with just android beta data excluding released OS version data.
APP_TESTERS This is the view with data only from users who have opted in to be testers for a given app, excluding OS beta data.