In late planning stage - Instrumentation for new data collection plan is in subtask.
Android and iOS apps currently track account creation and login events on different schemas/data streams, with some gaps that need to be addressed. We are planning to move both to the shared apps_base stream, with unified event naming/tracking.
This will also include all HCaptcha and Block notice logging and other logging events related to account validation as needed.
See Android and iOS Authentication Data Instrumentation Planning T417470
Current iOS Data:
event.ios_login_action
Current Android Data:
event.android_create_account_interaction
event.android_install_referrer_event
Data/Queries we frequently use
See also Web Special:CreateAccount https://phabricator.wikimedia.org/T394744