androidtvchannels-pa.googleapis.com - Android TV, promoted channels autodiscover.googleapis.com - ?? clientmetrics-pa.googleapis.com - ?? Tracking jnn-pa.googleapis.com - Consent management (third-parties) ad-creatives-public.commondatastorage.googleapis.com - ?? Advertising creatives related? gds.google.com - Google Data Studio ogads-pa.clients6.google.com - Appears to involve logging and Play store (play.google.com/log). Also: " I have been using OGAds for few years to monetize my traffic and I can say that it is one of the best mobile content locking networks in the market" signaler-pa.clients6.google.com
Note: client6. indicates a client (Android?) API endpoint.
history.google.com mtalk.google.com alt1-mtalk.google.com alt2-mtalk.google.com alt3-mtalk.google.com alt4-mtalk.google.com alt5-mtalk.google.com alt6-mtalk.google.com alt7-mtalk.google.com alt8-mtalk.google.com android.clients.google.com www.google.com android.googleapis.com play.googleapis.com cloudconfig.googleapis.com connectivitycheck.gstatic.com footprints-pa.googleapis.com mobilemaps.googleapis.com people-pa.googleapis.com www.googleapis.com www.googletagmanager.com play-lh.googleusercontent.com smtp.gmail.com history.google.com: relates to your account activities (searches , youtube, location, etc). That URL sends you to https://myactivity.google.com/myactivity?pli=1 mtalk.google.com (and alt*-mtalk.google.com): is related to GCM/FCM (Google Cloud Messaging/Firebase Cloud Messaging). This link explains Why does GCM needs to connect to mtalk.google.com ?: connectivitycheck.gstatic.com On this host typically only the URL https://connectivitycheck.gstatic.com/generate_204 is used. It is used by the Android device to determine if there is Internet access or not.
android.clients.google.com Primarily this host serves Google Play Store for all sorts of queries, e.g. search for apps, periodical device registration, ...
history.google.com The purpose of this host is not quite clear. The used service is called "history recording" and the server responds if it should be enabled or not. Potentially this is the host for the Google location history recording?
play.googleapis.com Obviously this API is used by Google Play Store. For example if an app should be downloaded this server is used (besides some other servers).
android.googleapis.com As far as I know this server is used for authentication purposes and for Google push notifications.
www.googleapis.com Used by various Google services such as Google Calendar, Drive, Chat, Hangouts, User Location, Android Video ...