Automatically collected events

Firebase collects these events by default.

Automatically collected events are triggered by basic interactions with your app. As long as you use the Firebase SDK, you don't need to write any additional code to collect these events. To see event reports, click Events in the report navigation in Google Analytics, or click the Events tab in the Firebase console.

Event name	Triggered...
ad_click	when a user clicks an ad.
ad_exposure	when at least one ad served by the Mobile Ads SDK is on screen.
ad_impression	when a user sees an ad impression.
ad_query	when an ad request is made by the Mobile Ads SDK.
ad_reward	when a reward is granted by a rewarded ad served by the Mobile Ads SDK.
adunit_exposure	when an ad unit served by the Mobile Ads SDK is on screen.
app_clear_data	when the user resets/clears the app data, removing all settings and sign-in data.
app_exception	when the app crashes or throws an exception.
app_remove	when an application package is removed or "uninstalled" from an Android device. This event is different from the Daily uninstalls by device and Daily uninstalls by user metrics, which are both reported by Google Play Developer Console. The app_remove event counts the removal of application packages, regardless of the installation source, and the count changes depending on the date range you are using for the report. The Daily uninstalls by device and Daily uninstalls by user metrics count the removal of application packages only when they were installed from Google Play, and are reported on a daily basis.
app_update	when the app is updated to a new version and launched again. The previous app version id is passed as a parameter. This event is conceptually different from the Daily upgrades by device metric, which is reported by Google Play Developer Console. An upgrade refers to the updating of the application binary, whereas an app_update event is triggered upon the subsequent launch of the upgraded app.
dynamic_link_app_open	when a user re-opens the app via a dynamic link.
dynamic_link_app_update	when the app is updated to a new version and is opened via a dynamic link. Android apps only.
dynamic_link_first_open	when a user opens the app for the first time via a dynamic link.
first_open	the first time a user launches an app after installing or re-installing it. This event is not triggered when a user downloads the app onto a device, but instead when he or she first uses it. To see raw download numbers, look in Google Play Developer Console or in iTunesConnect.
in_app_purchase	when a user completes an in-app purchase, including an initial subscription, that is processed by the App Store on iTunes or by Google Play. The product ID, product name, currency, and quantity are passed as parameters. To see in_app_purchase data for Android apps, you need to link Firebase to Google Play. This event is triggered only by versions of your app that include the Firebase SDK. Note: paid app-purchase revenue, subscription revenue (Android only), and refunds are not automatically tracked. Your reported revenue may differ from the values you see in the Google Play Developer Console. Events that are flagged as being invalid or as sandbox (test) are ignored. Only iOS events are flagged as sandbox. Learn more about testing Google Play billing.
notification_dismiss	when a user dismisses a notification sent by FCM. Android apps only.
notification_foreground	when a notification sent by FCM is received while the app is in the foreground.
notification_open	when a user opens a notification sent by FCM.
notification_receive	when a notification sent by FCM is received by a device when the app is in the background. Android apps only.
os_update	when the device operating system is updated to a new version. The previous operating system version id is passed as a parameter.
screen_view	when a screen transition occurs and any of the following criteria are met: No screen was previously set The new screen name differs from the previous screen name The new screen-class name differs from the previous screen-class name The new screen id differs from the previous screen id
session_start	when a user engages the app for more than the minimum session duration after a period of inactivity that exceeds the session timeout duration.
user_engagement	periodically, while the app is in the foreground.