import com.google.android.gms.analytics.TrackerImporting the com.google.android.gms.analytics.Tracker or com.google.firebase.analytics.FirebaseAnalytics classes means that the app sends hits to Google Analytics. It is not necessarily sensitive information, but it is a first step towards Google Ads and hence this practice should be discouraged at early stage.
Import of Google Analytics :
import com.google.android.gms.analytics.TrackerImport of Firebase Analytics :
import com.google.firebase.analytics