The average number of active days per device for the selected report period. An active day is a day for which at least one event on the device was logged: a registration, authorization, launch, hit, in-app impression, or payments.
Payment includes an in-app payment, subscription, subscription renewal or custom revenue
Activity days Flow – Flow metric
Activity days CA – Current Attribution metric
Activity days LT – LifeTime metric
Activity days AT – Attribution Time metric
