iceraven-browser/docs/metrics.md

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# Metrics

This document enumerates the metrics collected by this project using the [Glean SDK](https://mozilla.github.io/glean/book/index.html).
This project may depend on other projects which also collect metrics.
This means you might have to go searching through the dependency tree to get a full picture of everything collected by this project.

# Pings

- [activation](#activation)
- [events](#events)
- [first-session](#first-session)
- [metrics](#metrics)
- [startup-timeline](#startup-timeline)

## activation

This ping is intended to provide a measure of the activation of mobile
products. It's generated when Fenix starts, right after Glean is
initialized. It doesn't include the client_id, since it might be reporting
an hashed version of the Google Advertising ID.


**Data reviews for this ping:**

- <https://github.com/mozilla-mobile/fenix/pull/1707#issuecomment-486972209>

**Bugs related to this ping:**

- <https://bugzilla.mozilla.com/1538011/>
- <https://bugzilla.mozilla.com/1501822/>

All Glean pings contain built-in metrics in the [`ping_info`](https://mozilla.github.io/glean/book/user/pings/index.html#the-ping_info-section) and [`client_info`](https://mozilla.github.io/glean/book/user/pings/index.html#the-client_info-section) sections.

In addition to those built-in metrics, the following metrics are added to the ping:

| Name | Type | Description | Data reviews | Extras | Expiration | [Data Sensitivity](https://wiki.mozilla.org/Firefox/Data_Collection) |
| --- | --- | --- | --- | --- | --- | --- |
| activation.activation_id |[uuid](https://mozilla.github.io/glean/book/user/metrics/uuid.html) |An alternate identifier, not correlated with the client_id, generated once and only sent with the activation ping.  |[mozilla-mobile/fenix#1707](https://github.com/mozilla-mobile/fenix/pull/1707#issuecomment-486972209), [mozilla-mobile/fenix#13958](https://github.com/mozilla-mobile/fenix/pull/13958#issuecomment-676857877), [mozilla-mobile/fenix#18143](https://github.com/mozilla-mobile/fenix/pull/18143)||2021-07-01 |4 |
| activation.identifier |[string](https://mozilla.github.io/glean/book/user/metrics/string.html) |A hashed and salted version of the Google Advertising ID from the device. This will never be sent in a ping that also contains the client_id.  |[mozilla-mobile/fenix#1707](https://github.com/mozilla-mobile/fenix/pull/1707#issuecomment-486972209), [mozilla-mobile/fenix#13958](https://github.com/mozilla-mobile/fenix/pull/13958#issuecomment-676857877), [mozilla-mobile/fenix#18143](https://github.com/mozilla-mobile/fenix/pull/18143)||2021-07-01 |4 |

## events

This is a built-in ping that is assembled out of the box by the Glean SDK.

See the Glean SDK documentation for the [`events` ping](https://mozilla.github.io/glean/book/user/pings/events.html).

All Glean pings contain built-in metrics in the [`ping_info`](https://mozilla.github.io/glean/book/user/pings/index.html#the-ping_info-section) and [`client_info`](https://mozilla.github.io/glean/book/user/pings/index.html#the-client_info-section) sections.

In addition to those built-in metrics, the following metrics are added to the ping:

| Name | Type | Description | Data reviews | Extras | Expiration | [Data Sensitivity](https://wiki.mozilla.org/Firefox/Data_Collection) |
| --- | --- | --- | --- | --- | --- | --- |
| about_page.privacy_notice_tapped |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user tapped on "Privacy notice" item from About page  |[mozilla-mobile/fenix#8047](https://github.com/mozilla-mobile/fenix/pull/8047), [mozilla-mobile/fenix#13958](https://github.com/mozilla-mobile/fenix/pull/13958#issuecomment-676857877), [mozilla-mobile/fenix#18143](https://github.com/mozilla-mobile/fenix/pull/18143)||2021-07-01 |2 |
| about_page.support_tapped |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user tapped on "Support" item from About page  |[mozilla-mobile/fenix#8047](https://github.com/mozilla-mobile/fenix/pull/8047), [mozilla-mobile/fenix#13958](https://github.com/mozilla-mobile/fenix/pull/13958#issuecomment-676857877), [mozilla-mobile/fenix#18143](https://github.com/mozilla-mobile/fenix/pull/18143)||2021-07-01 |2 |
| addons.open_addon_in_toolbar_menu |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user interacted with an installed add-on in the toolbar menu  |[mozilla-mobile/fenix#8318](https://github.com/mozilla-mobile/fenix/pull/8318), [mozilla-mobile/fenix#13958](https://github.com/mozilla-mobile/fenix/pull/13958#issuecomment-676857877), [mozilla-mobile/fenix#18143](https://github.com/mozilla-mobile/fenix/pull/18143)|<ul><li>addon_id: The id of the add-on that was interacted with in the toolbar menu </li></ul>|2021-07-01 |2 |
| addons.open_addon_setting |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user opened an add-on's setting  |[mozilla-mobile/fenix#18504](https://github.com/mozilla-mobile/fenix/pull/18504)|<ul><li>addon_id: The id of the add-on that was interacted with </li></ul>|2022-08-01 |2 |
| addons.open_addons_in_settings |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user accessed "Add-ons" from the Settings  |[mozilla-mobile/fenix#8318](https://github.com/mozilla-mobile/fenix/pull/8318), [mozilla-mobile/fenix#13958](https://github.com/mozilla-mobile/fenix/pull/13958#issuecomment-676857877), [mozilla-mobile/fenix#18143](https://github.com/mozilla-mobile/fenix/pull/18143)||2021-07-01 |2 |
| android_keystore_experiment.experiment_failure |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |Records an instance of an unexpected failure during the experiment  |[mozilla-mobile/fenix#18333](https://github.com/mozilla-mobile/fenix/pull/18333#pullrequestreview-612447395)|<ul><li>failure_exception: Exception class associated with an unexpected failure of this experiment, not caught by the other failure handlers. </li></ul>|2021-09-01 |1 |
| android_keystore_experiment.get_failure |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |Unexpected failure when trying to read from secure prefs.  |[mozilla-mobile/fenix#18333](https://github.com/mozilla-mobile/fenix/pull/18333#pullrequestreview-612447395)|<ul><li>failure_exception: Exception class associated with an unexpected failure of this experiment. </li></ul>|2021-09-01 |1 |
| android_keystore_experiment.get_result |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |Success when trying to read from secure prefs.  |[mozilla-mobile/fenix#18333](https://github.com/mozilla-mobile/fenix/pull/18333#pullrequestreview-612447395)|<ul><li>result: Result code identifying whether the read operation returned the expected value or not. </li></ul>|2021-09-01 |1 |
| android_keystore_experiment.reset |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |An experiment failed, and was reset to run again in the future from a blank state.  |[mozilla-mobile/fenix#18333](https://github.com/mozilla-mobile/fenix/pull/18333#pullrequestreview-612447395)||2021-09-01 |1 |
| android_keystore_experiment.write_failure |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |Unexpected failure when trying to write to secure prefs.  |[mozilla-mobile/fenix#18333](https://github.com/mozilla-mobile/fenix/pull/18333#pullrequestreview-612447395)|<ul><li>failure_exception: Exception class associated with an unexpected failure of this experiment. </li></ul>|2021-09-01 |1 |
| android_keystore_experiment.write_success |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |Success in writing to secure prefs.  |[mozilla-mobile/fenix#18333](https://github.com/mozilla-mobile/fenix/pull/18333#pullrequestreview-612447395)||2021-09-01 |1 |
| app_theme.dark_theme_selected |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user selected Dark Theme  |[mozilla-mobile/fenix#7968](https://github.com/mozilla-mobile/fenix/pull/7968), [mozilla-mobile/fenix#13958](https://github.com/mozilla-mobile/fenix/pull/13958#issuecomment-676857877), [mozilla-mobile/fenix#18143](https://github.com/mozilla-mobile/fenix/pull/18143)|<ul><li>source: The source from where dark theme was selected. The source can be 'SETTINGS' or 'ONBOARDING' </li></ul>|2021-07-01 |2 |
| autoplay.setting_changed |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user changed their autoplay setting to either block_cellular, block_audio, or block_all.  |[mozilla-mobile/fenix#13041](https://github.com/mozilla-mobile/fenix/pull/13041#issuecomment-665777411)|<ul><li>autoplay_setting: The new setting for autoplay: block_cellular, block_audio, or block_all. </li></ul>|2021-08-01 |2 |
| autoplay.visited_setting |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user visited the autoplay settings screen |[mozilla-mobile/fenix#13041](https://github.com/mozilla-mobile/fenix/pull/13041#issuecomment-665777411)||2021-08-01 |2 |
| awesomebar.bookmark_suggestion_clicked |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |The bookmark suggestion in awesomebar was clicked.  |[mozilla-mobile/fenix#18090](https://github.com/mozilla-mobile/fenix/pull/18090)||2021-08-01 |2 |
| awesomebar.clipboard_suggestion_clicked |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |The clipboard suggestion in awesomebar was clicked.  |[mozilla-mobile/fenix#18090](https://github.com/mozilla-mobile/fenix/pull/18090)||2021-08-01 |2 |
| awesomebar.history_suggestion_clicked |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |The history suggestion in awesomebar was clicked.  |[mozilla-mobile/fenix#18090](https://github.com/mozilla-mobile/fenix/pull/18090)||2021-08-01 |2 |
| awesomebar.opened_tab_suggestion_clicked |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |The opened tab suggestion in awesomebar was clicked.  |[mozilla-mobile/fenix#18090](https://github.com/mozilla-mobile/fenix/pull/18090)||2021-08-01 |2 |
| awesomebar.search_action_clicked |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |The search action in awesomebar was clicked.  |[mozilla-mobile/fenix#18090](https://github.com/mozilla-mobile/fenix/pull/18090)||2021-08-01 |2 |
| awesomebar.search_suggestion_clicked |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |The search suggestion in awesomebar was clicked.  |[mozilla-mobile/fenix#18090](https://github.com/mozilla-mobile/fenix/pull/18090)||2021-08-01 |2 |
| banner_open_in_app.dismissed |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |User tapped 'dismiss' on Open in App banner.  |[mozilla-mobile/fenix#17049](https://github.com/mozilla-mobile/fenix/pull/17049)||2021-08-01 |2 |
| banner_open_in_app.displayed |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |Open in App banner was shown.  |[mozilla-mobile/fenix#17049](https://github.com/mozilla-mobile/fenix/pull/17049)||2021-08-01 |2 |
| banner_open_in_app.go_to_settings |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |User tapped 'go to settings' on Open in App banner.  |[mozilla-mobile/fenix#17049](https://github.com/mozilla-mobile/fenix/pull/17049)||2021-08-01 |2 |
| bookmarks_management.copied |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user copied a bookmark.  |[mozilla-mobile/fenix#1708](https://github.com/mozilla-mobile/fenix/pull/1708), [mozilla-mobile/fenix#13958](https://github.com/mozilla-mobile/fenix/pull/13958#issuecomment-676857877), [mozilla-mobile/fenix#18143](https://github.com/mozilla-mobile/fenix/pull/18143)||2021-07-01 |2 |
| bookmarks_management.edited |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user edited the title and/or URL of an existing bookmark.  |[mozilla-mobile/fenix#1708](https://github.com/mozilla-mobile/fenix/pull/1708), [mozilla-mobile/fenix#13958](https://github.com/mozilla-mobile/fenix/pull/13958#issuecomment-676857877), [mozilla-mobile/fenix#18143](https://github.com/mozilla-mobile/fenix/pull/18143)||2021-07-01 |2 |
| bookmarks_management.folder_add |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user added a new bookmark folder.  |[mozilla-mobile/fenix#1708](https://github.com/mozilla-mobile/fenix/pull/1708), [mozilla-mobile/fenix#13958](https://github.com/mozilla-mobile/fenix/pull/13958#issuecomment-676857877), [mozilla-mobile/fenix#18143](https://github.com/mozilla-mobile/fenix/pull/18143)||2021-07-01 |2 |
| bookmarks_management.folder_remove |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user removed a bookmark folder.  |[mozilla-mobile/fenix#3724](https://github.com/mozilla-mobile/fenix/pull/3724), [mozilla-mobile/fenix#13958](https://github.com/mozilla-mobile/fenix/pull/13958#issuecomment-676857877), [mozilla-mobile/fenix#18143](https://github.com/mozilla-mobile/fenix/pull/18143)||2021-07-01 |2 |
| bookmarks_management.moved |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user moved an existing bookmark or folder to another folder.  |[mozilla-mobile/fenix#1708](https://github.com/mozilla-mobile/fenix/pull/1708), [mozilla-mobile/fenix#13958](https://github.com/mozilla-mobile/fenix/pull/13958#issuecomment-676857877), [mozilla-mobile/fenix#18143](https://github.com/mozilla-mobile/fenix/pull/18143)||2021-07-01 |2 |
| bookmarks_management.multi_removed |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user removed multiple bookmarks at once.  |[mozilla-mobile/fenix#1708](https://github.com/mozilla-mobile/fenix/pull/1708), [mozilla-mobile/fenix#13958](https://github.com/mozilla-mobile/fenix/pull/13958#issuecomment-676857877), [mozilla-mobile/fenix#18143](https://github.com/mozilla-mobile/fenix/pull/18143)||2021-07-01 |2 |
| bookmarks_management.open |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user opened a bookmark.  |[mozilla-mobile/fenix#18174](https://github.com/mozilla-mobile/fenix/pull/18174)||2022-08-01 |2 |
| bookmarks_management.open_in_new_tab |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user opened a bookmark in a new tab.  |[mozilla-mobile/fenix#1708](https://github.com/mozilla-mobile/fenix/pull/1708), [mozilla-mobile/fenix#13958](https://github.com/mozilla-mobile/fenix/pull/13958#issuecomment-676857877), [mozilla-mobile/fenix#18143](https://github.com/mozilla-mobile/fenix/pull/18143)||2021-07-01 |2 |
| bookmarks_management.open_in_new_tabs |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user opened multiple bookmarks at once in new tabs.  |[mozilla-mobile/fenix#1708](https://github.com/mozilla-mobile/fenix/pull/1708), [mozilla-mobile/fenix#13958](https://github.com/mozilla-mobile/fenix/pull/13958#issuecomment-676857877), [mozilla-mobile/fenix#18143](https://github.com/mozilla-mobile/fenix/pull/18143)||2021-07-01 |2 |
| bookmarks_management.open_in_private_tab |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user opened a bookmark in a new private tab.  |[mozilla-mobile/fenix#1708](https://github.com/mozilla-mobile/fenix/pull/1708), [mozilla-mobile/fenix#13958](https://github.com/mozilla-mobile/fenix/pull/13958#issuecomment-676857877), [mozilla-mobile/fenix#18143](https://github.com/mozilla-mobile/fenix/pull/18143)||2021-07-01 |2 |
| bookmarks_management.open_in_private_tabs |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user opened multiple bookmarks at once in new private tabs.  |[mozilla-mobile/fenix#1708](https://github.com/mozilla-mobile/fenix/pull/1708), [mozilla-mobile/fenix#13958](https://github.com/mozilla-mobile/fenix/pull/13958#issuecomment-676857877), [mozilla-mobile/fenix#18143](https://github.com/mozilla-mobile/fenix/pull/18143)||2021-07-01 |2 |
| bookmarks_management.removed |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user removed a bookmark item.  |[mozilla-mobile/fenix#1708](https://github.com/mozilla-mobile/fenix/pull/1708), [mozilla-mobile/fenix#13958](https://github.com/mozilla-mobile/fenix/pull/13958#issuecomment-676857877), [mozilla-mobile/fenix#18143](https://github.com/mozilla-mobile/fenix/pull/18143)||2021-07-01 |2 |
| bookmarks_management.shared |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user shared a bookmark.  |[mozilla-mobile/fenix#1708](https://github.com/mozilla-mobile/fenix/pull/1708), [mozilla-mobile/fenix#13958](https://github.com/mozilla-mobile/fenix/pull/13958#issuecomment-676857877), [mozilla-mobile/fenix#18143](https://github.com/mozilla-mobile/fenix/pull/18143)||2021-07-01 |2 |
| collections.add_tab_button |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user tapped the "add tab" button in the three dot menu of collections  |[mozilla-mobile/fenix#4358](https://github.com/mozilla-mobile/fenix/pull/4358), [mozilla-mobile/fenix#13958](https://github.com/mozilla-mobile/fenix/pull/13958#issuecomment-676857877), [mozilla-mobile/fenix#18143](https://github.com/mozilla-mobile/fenix/pull/18143)||2021-07-01 |2 |
| collections.all_tabs_restored |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user tapped "open tabs" from collection menu  |[mozilla-mobile/fenix#3935](https://github.com/mozilla-mobile/fenix/pull/3935), [mozilla-mobile/fenix#13958](https://github.com/mozilla-mobile/fenix/pull/13958#issuecomment-676857877), [mozilla-mobile/fenix#18143](https://github.com/mozilla-mobile/fenix/pull/18143)||2021-07-01 |1, 2 |
| collections.long_press |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user long pressed on a tab, triggering the collection creation screen  |[mozilla-mobile/fenix#4358](https://github.com/mozilla-mobile/fenix/pull/4358), [mozilla-mobile/fenix#13958](https://github.com/mozilla-mobile/fenix/pull/13958#issuecomment-676857877), [mozilla-mobile/fenix#18143](https://github.com/mozilla-mobile/fenix/pull/18143)||2021-07-01 |2 |
| collections.removed |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user tapped delete collection from collection menu  |[mozilla-mobile/fenix#3935](https://github.com/mozilla-mobile/fenix/pull/3935), [mozilla-mobile/fenix#13958](https://github.com/mozilla-mobile/fenix/pull/13958#issuecomment-676857877), [mozilla-mobile/fenix#18143](https://github.com/mozilla-mobile/fenix/pull/18143)||2021-07-01 |1, 2 |
| collections.rename_button |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user pressed the "rename collection" button in the three dot menu  |[mozilla-mobile/fenix#4539](https://github.com/mozilla-mobile/fenix/pull/4539), [mozilla-mobile/fenix#13958](https://github.com/mozilla-mobile/fenix/pull/13958#issuecomment-676857877), [mozilla-mobile/fenix#18143](https://github.com/mozilla-mobile/fenix/pull/18143)||2021-07-01 |2 |
| collections.renamed |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user renamed a collection  |[mozilla-mobile/fenix#3935](https://github.com/mozilla-mobile/fenix/pull/3935), [mozilla-mobile/fenix#13958](https://github.com/mozilla-mobile/fenix/pull/13958#issuecomment-676857877), [mozilla-mobile/fenix#18143](https://github.com/mozilla-mobile/fenix/pull/18143)||2021-07-01 |1, 2 |
| collections.save_button |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user pressed the "save to collection" button on either the home or browser screen, triggering the collection creation screen to open (tab_select_opened)  |[mozilla-mobile/fenix#4358](https://github.com/mozilla-mobile/fenix/pull/4358), [mozilla-mobile/fenix#13958](https://github.com/mozilla-mobile/fenix/pull/13958#issuecomment-676857877), [mozilla-mobile/fenix#18143](https://github.com/mozilla-mobile/fenix/pull/18143)|<ul><li>from_screen: A string representing the screen from which the user pressed the save button. Currently one of: `browserMenu`, `homeMenu` or `home` </li></ul>|2021-07-01 |2 |
| collections.saved |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user saved a list of tabs to a new collection  |[mozilla-mobile/fenix#3935](https://github.com/mozilla-mobile/fenix/pull/3935), [mozilla-mobile/fenix#13958](https://github.com/mozilla-mobile/fenix/pull/13958#issuecomment-676857877), [mozilla-mobile/fenix#18143](https://github.com/mozilla-mobile/fenix/pull/18143)|<ul><li>tabs_open: The number of tabs open in the current session</li><li>tabs_selected: The number of tabs added to the collection</li></ul>|2021-07-01 |1, 2 |
| collections.shared |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user tapped share collection  |[mozilla-mobile/fenix#3935](https://github.com/mozilla-mobile/fenix/pull/3935), [mozilla-mobile/fenix#13958](https://github.com/mozilla-mobile/fenix/pull/13958#issuecomment-676857877), [mozilla-mobile/fenix#18143](https://github.com/mozilla-mobile/fenix/pull/18143)||2021-07-01 |1, 2 |
| collections.tab_removed |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user tapped remove tab from collection tab list  |[mozilla-mobile/fenix#3935](https://github.com/mozilla-mobile/fenix/pull/3935), [mozilla-mobile/fenix#13958](https://github.com/mozilla-mobile/fenix/pull/13958#issuecomment-676857877), [mozilla-mobile/fenix#18143](https://github.com/mozilla-mobile/fenix/pull/18143)||2021-07-01 |1, 2 |
| collections.tab_restored |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user restored a tab from collection tab list  |[mozilla-mobile/fenix#3935](https://github.com/mozilla-mobile/fenix/pull/3935), [mozilla-mobile/fenix#13958](https://github.com/mozilla-mobile/fenix/pull/13958#issuecomment-676857877), [mozilla-mobile/fenix#18143](https://github.com/mozilla-mobile/fenix/pull/18143)||2021-07-01 |1, 2 |
| collections.tab_select_opened |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user opened the select tabs screen (the first step of the collection creation flow)  |[mozilla-mobile/fenix#3935](https://github.com/mozilla-mobile/fenix/pull/3935), [mozilla-mobile/fenix#13958](https://github.com/mozilla-mobile/fenix/pull/13958#issuecomment-676857877), [mozilla-mobile/fenix#18143](https://github.com/mozilla-mobile/fenix/pull/18143)||2021-07-01 |1, 2 |
| collections.tabs_added |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user saved a list of tabs to an existing collection  |[mozilla-mobile/fenix#3935](https://github.com/mozilla-mobile/fenix/pull/3935), [mozilla-mobile/fenix#13958](https://github.com/mozilla-mobile/fenix/pull/13958#issuecomment-676857877), [mozilla-mobile/fenix#18143](https://github.com/mozilla-mobile/fenix/pull/18143)|<ul><li>tabs_open: The number of tabs open in the current session</li><li>tabs_selected: The number of tabs added to the collection</li></ul>|2021-07-01 |1, 2 |
| context_menu.item_tapped |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user tapped an item in the browsers context menu  |[mozilla-mobile/fenix#1344](https://github.com/mozilla-mobile/fenix/pull/1344#issuecomment-479285010), [mozilla-mobile/fenix#13958](https://github.com/mozilla-mobile/fenix/pull/13958#issuecomment-676857877), [mozilla-mobile/fenix/issues/16076](https://github.com/mozilla-mobile/fenix/issues/16076#issuecomment-726216734), [mozilla-mobile/fenix#18143](https://github.com/mozilla-mobile/fenix/pull/18143)|<ul><li>named: The name of the item that was tapped. Available items are:  ``` open_in_new_tab, open_in_private_tab, open_image_in_new_tab, save_image, share_link, copy_link, copy_image_location, share_image ``` </li></ul>|2021-07-01 |2 |
| contextual_hint.tracking_protection.dismiss |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |The enhanced tracking protection contextual hint was dismissed by pressing the close button  |[mozilla-mobile/fenix#11923](https://github.com/mozilla-mobile/fenix/pull/11923), [mozilla-mobile/fenix#13958](https://github.com/mozilla-mobile/fenix/pull/13958#issuecomment-676857877), [mozilla-mobile/fenix#18143](https://github.com/mozilla-mobile/fenix/pull/18143)||2021-07-01 |2 |
| contextual_hint.tracking_protection.display |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |The enhanced tracking protection contextual hint was displayed.  |[mozilla-mobile/fenix#11923](https://github.com/mozilla-mobile/fenix/pull/11923), [mozilla-mobile/fenix#13958](https://github.com/mozilla-mobile/fenix/pull/13958#issuecomment-676857877), [mozilla-mobile/fenix#18143](https://github.com/mozilla-mobile/fenix/pull/18143)||2021-07-01 |2 |
| contextual_hint.tracking_protection.inside_tap |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |The user tapped inside of the etp contextual hint (which brings up the etp panel for this site).  |[mozilla-mobile/fenix#11923](https://github.com/mozilla-mobile/fenix/pull/11923), [mozilla-mobile/fenix#13958](https://github.com/mozilla-mobile/fenix/pull/13958#issuecomment-676857877), [mozilla-mobile/fenix#18143](https://github.com/mozilla-mobile/fenix/pull/18143)||2021-07-01 |2 |
| contextual_hint.tracking_protection.outside_tap |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |The user tapped outside of the etp contextual hint (which has no effect).  |[mozilla-mobile/fenix#11923](https://github.com/mozilla-mobile/fenix/pull/11923), [mozilla-mobile/fenix#13958](https://github.com/mozilla-mobile/fenix/pull/13958#issuecomment-676857877), [mozilla-mobile/fenix#18143](https://github.com/mozilla-mobile/fenix/pull/18143)||2021-07-01 |2 |
| contextual_menu.copy_tapped |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |The context menu's 'copy' option was used.  |[mozilla-mobile/fenix#16968](https://github.com/mozilla-mobile/fenix/pull/16968)||2021-06-01 |2 |
| contextual_menu.search_tapped |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |The context menu's 'search' option was used.  |[mozilla-mobile/fenix#16968](https://github.com/mozilla-mobile/fenix/pull/16968)||2021-06-01 |2 |
| contextual_menu.select_all_tapped |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |The context menu's 'select all' option was used.  |[mozilla-mobile/fenix#16968](https://github.com/mozilla-mobile/fenix/pull/16968)||2021-06-01 |2 |
| contextual_menu.share_tapped |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |The context menu's 'share' option was used.  |[mozilla-mobile/fenix#16968](https://github.com/mozilla-mobile/fenix/pull/16968)||2021-06-01 |2 |
| crash_reporter.closed |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |The crash reporter was closed  |[mozilla-mobile/fenix#1214](https://github.com/mozilla-mobile/fenix/pull/1214#issue-264756708), [mozilla-mobile/fenix#13958](https://github.com/mozilla-mobile/fenix/pull/13958#issuecomment-676857877), [mozilla-mobile/fenix#18143](https://github.com/mozilla-mobile/fenix/pull/18143)|<ul><li>crash_submitted: A boolean that tells us whether or not the user submitted a crash report </li></ul>|2021-07-01 |2 |
| crash_reporter.opened |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |The crash reporter was displayed  |[mozilla-mobile/fenix#1214](https://github.com/mozilla-mobile/fenix/pull/1214#issue-264756708), [mozilla-mobile/fenix#13958](https://github.com/mozilla-mobile/fenix/pull/13958#issuecomment-676857877), [mozilla-mobile/fenix#18143](https://github.com/mozilla-mobile/fenix/pull/18143)||2021-07-01 |2 |
| custom_tab.action_button |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user pressed the action button provided by the launching app  |[mozilla-mobile/fenix#1697](https://github.com/mozilla-mobile/fenix/pull/1697), [mozilla-mobile/fenix#13958](https://github.com/mozilla-mobile/fenix/pull/13958#issuecomment-676857877), [mozilla-mobile/fenix#18143](https://github.com/mozilla-mobile/fenix/pull/18143)||2021-07-01 |2 |
| custom_tab.closed |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user closed the custom tab  |[mozilla-mobile/fenix#1697](https://github.com/mozilla-mobile/fenix/pull/1697), [mozilla-mobile/fenix#13958](https://github.com/mozilla-mobile/fenix/pull/13958#issuecomment-676857877), [mozilla-mobile/fenix#18143](https://github.com/mozilla-mobile/fenix/pull/18143)||2021-07-01 |2 |
| custom_tab.menu |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user opened the custom tabs menu  |[mozilla-mobile/fenix#1697](https://github.com/mozilla-mobile/fenix/pull/1697), [mozilla-mobile/fenix#13958](https://github.com/mozilla-mobile/fenix/pull/13958#issuecomment-676857877), [mozilla-mobile/fenix#18143](https://github.com/mozilla-mobile/fenix/pull/18143)||2021-07-01 |2 |
| download_notification.cancel |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user cancelled a download in the download notification  |[mozilla-mobile/fenix#6554](https://github.com/mozilla-mobile/fenix/pull/6554), [mozilla-mobile/fenix#13958](https://github.com/mozilla-mobile/fenix/pull/13958#issuecomment-676857877), [mozilla-mobile/fenix#18143](https://github.com/mozilla-mobile/fenix/pull/18143)||2021-07-01 |2 |
| download_notification.in_app_open |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user opened a downloaded file in the in-app notification link  |[mozilla-mobile/fenix#6554](https://github.com/mozilla-mobile/fenix/pull/6554), [mozilla-mobile/fenix#13958](https://github.com/mozilla-mobile/fenix/pull/13958#issuecomment-676857877), [mozilla-mobile/fenix#18143](https://github.com/mozilla-mobile/fenix/pull/18143)||2021-07-01 |2 |
| download_notification.in_app_try_again |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user tapped on try again when a download fails in the in-app notification link  |[mozilla-mobile/fenix#6554](https://github.com/mozilla-mobile/fenix/pull/6554), [mozilla-mobile/fenix#13958](https://github.com/mozilla-mobile/fenix/pull/13958#issuecomment-676857877), [mozilla-mobile/fenix#18143](https://github.com/mozilla-mobile/fenix/pull/18143)||2021-07-01 |2 |
| download_notification.open |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user opened a downloaded file in the download notification  |[mozilla-mobile/fenix#6554](https://github.com/mozilla-mobile/fenix/pull/6554), [mozilla-mobile/fenix#13958](https://github.com/mozilla-mobile/fenix/pull/13958#issuecomment-676857877), [mozilla-mobile/fenix#18143](https://github.com/mozilla-mobile/fenix/pull/18143)||2021-07-01 |2 |
| download_notification.pause |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user paused a download in the download notification  |[mozilla-mobile/fenix#6554](https://github.com/mozilla-mobile/fenix/pull/6554), [mozilla-mobile/fenix#13958](https://github.com/mozilla-mobile/fenix/pull/13958#issuecomment-676857877), [mozilla-mobile/fenix#18143](https://github.com/mozilla-mobile/fenix/pull/18143)||2021-07-01 |2 |
| download_notification.resume |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user resumed a download in the download notification  |[mozilla-mobile/fenix#6554](https://github.com/mozilla-mobile/fenix/pull/6554), [mozilla-mobile/fenix#13958](https://github.com/mozilla-mobile/fenix/pull/13958#issuecomment-676857877), [mozilla-mobile/fenix#18143](https://github.com/mozilla-mobile/fenix/pull/18143)||2021-07-01 |2 |
| download_notification.try_again |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user tapped on try again when a download fails in the download notification  |[mozilla-mobile/fenix#6554](https://github.com/mozilla-mobile/fenix/pull/6554), [mozilla-mobile/fenix#13958](https://github.com/mozilla-mobile/fenix/pull/13958#issuecomment-676857877), [mozilla-mobile/fenix#18143](https://github.com/mozilla-mobile/fenix/pull/18143)||2021-07-01 |2 |
| downloads_management.downloads_screen_opened |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A counter for the number of times users access the "Downloads" folder inside the app.  |[mozilla-mobile/fenix#16728](https://github.com/mozilla-mobile/fenix/pull/16728), [mozilla-mobile/fenix#18143](https://github.com/mozilla-mobile/fenix/pull/18143)||2021-07-01 | |
| downloads_management.item_deleted |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A counter for how often a user deletes one / more downloads at a time.  |[mozilla-mobile/fenix#16728](https://github.com/mozilla-mobile/fenix/pull/16728), [mozilla-mobile/fenix#18143](https://github.com/mozilla-mobile/fenix/pull/18143)||2021-07-01 | |
| downloads_management.item_opened |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A counter for how often a user tap to opens a download from inside the "Downloads" folder.  |[mozilla-mobile/fenix#16728](https://github.com/mozilla-mobile/fenix/pull/16728), [mozilla-mobile/fenix#18143](https://github.com/mozilla-mobile/fenix/pull/18143)||2021-07-01 | |
| downloads_misc.download_added |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A counter for how many times something is downloaded in the app. |[mozilla-mobile/fenix#16730](https://github.com/mozilla-mobile/fenix/pull/16730), [mozilla-mobile/fenix#18143](https://github.com/mozilla-mobile/fenix/pull/18143)||2021-07-01 | |
| engine_tab.foreground_metrics |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |Event collecting data about the state of tabs when the app comes back to the foreground.  |[mozilla-mobile/fenix#18747](https://github.com/mozilla-mobile/fenix/pull/18747#issuecomment-815731764)|<ul><li>background_active_tabs: Number of active tabs (with an engine session assigned) when the app went to the background. </li><li>background_crashed_tabs: Number of tabs marked as crashed when the app went to the background. </li><li>background_total_tabs: Number of total tabs when the app went to the background. </li><li>foreground_active_tabs: Number of active tabs (with an engine session assigned) when the app came back to the foreground. </li><li>foreground_crashed_tabs: Number of tabs marked as crashed when the app came back to the foreground. </li><li>foreground_total_tabs: Number of total tabs when the app came back to the foreground. </li><li>time_in_background: Time (in milliseconds) the app was in the background. </li></ul>|2021-12-31 |1 |
| error_page.visited_error |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user encountered an error page  |[mozilla-mobile/fenix#2491](https://github.com/mozilla-mobile/fenix/pull/2491#issuecomment-492414486), [mozilla-mobile/fenix#13958](https://github.com/mozilla-mobile/fenix/pull/13958#issuecomment-676857877), [mozilla-mobile/fenix#18143](https://github.com/mozilla-mobile/fenix/pull/18143)|<ul><li>error_type: The error type of the error page encountered</li></ul>|2021-07-01 |2 |
| events.app_opened |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user opened the app (from cold start, to the homescreen or browser)  |[mozilla-mobile/fenix#1067](https://github.com/mozilla-mobile/fenix/pull/1067#issuecomment-474598673), [mozilla-mobile/fenix#13958](https://github.com/mozilla-mobile/fenix/pull/13958#issuecomment-676857877), [mozilla-mobile/fenix#18143](https://github.com/mozilla-mobile/fenix/pull/18143)|<ul><li>source: The method used to open Fenix. Possible values are: `app_icon`, `custom_tab` or `link` </li></ul>|2021-07-01 |2 |
| events.app_opened_all_startup |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |**This probe has a known flaw:** for COLD start up, it doesn't take into account if the process is already running when the app starts, possibly inflating results (e.g. a Service started the process 20min ago and only now is HomeActivity launching). See the `cold_*_app_to_first_frame` probes for a replacement. <br><br> A user opened the app to the HomeActivity. The HomeActivity encompasses the home screen, browser screen, settings screen, collections and other screens in the nav_graph. This differs from the app_opened probe because it measures all startups, not just cold startup. Note: There is a short gap between the time application goes into background and the time android reports the application going into the background. Note: This metric does not record souce when app opened from task switcher: open application -> press home button -> open recent tasks -> choose fenix. In this case will report [source = unknown, type = hot, has_saved_instance_state = false].  |[mozilla-mobile/fenix#12114](https://github.com/mozilla-mobile/fenix/pull/12114#pullrequestreview-445245341), [mozilla-mobile/fenix#13958](https://github.com/mozilla-mobile/fenix/pull/13958#issuecomment-676857877), [mozilla-mobile/fenix#13494](https://github.com/mozilla-mobile/fenix/pull/13494#pullrequestreview-474050499), [mozilla-mobile/fenix#15605](https://github.com/mozilla-mobile/fenix/pull/15605#issuecomment-702365594)|<ul><li>first_frame_pre_draw_nanos: the number of nanoseconds the application took to launch. This is the time difference between application launch(user pressing app_icon, launching a link) and until the first view is about to be drawn on the screen. If the time is not captured, this extra key will not be reported. </li><li>has_saved_instance_state: boolean value whether or not startup type has a savedInstance. using savedInstance, HomeActivity's previous state can be restored. This is an optional key since it is not applicable to all the cases. for example, when we are doing a hot start up, we cant have a savedInstanceState therefore we report only [APP_ICON, HOT] instead of [APP_ICON, HOT, false]. </li><li>source: The method used to open Fenix. Possible values are `app_icon`, `custom_tab`, `link` or `unknown`. unknown is for startup sources where we can't pinpoint the cause. One UNKNOWN case is the app switcher where we don't know what variables to check to ensure this startup wasn't caused by something else. </li><li>type: the startup type for opening fenix. the application and HomeActivity either needs to be created or started again. possible values are `cold`, `warm`, `hot` or `error`. Error is for impossible cases. Please file a bug if you see the error case. app created AND HomeActivity created = cold app started AND HomeActivity created = warm app started AND HomeActivity started = hot app created AND HomeActivity started = error Some applications such as gmail launches the default browser in the background. So when we eventually click a link, browser is already started in the background. This means that custom_tab will mostly report `warm` startup type. </li></ul>|2021-06-01 |2 |
| events.app_received_intent |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |The system received an Intent for the HomeActivity. An intent is received an external entity wants to the app to display content. Intents can be received when the app is closed – at which point the app will be opened – or when the app is already opened – at which point the already open app will make changes such as loading a url. This can be used loosely as a heuristic for when the user requested to open the app. The HomeActivity encompasses the home screen and browser screen but may include other screens. This differs from the app_opened probe because it measures all startups, not just cold startup.  |[mozilla-mobile/fenix#11940/](https://github.com/mozilla-mobile/fenix/pull/11940/), [mozilla-mobile/fenix#13958](https://github.com/mozilla-mobile/fenix/pull/13958#issuecomment-676857877)|<ul><li>source: The method used to open Fenix. Possible values are `app_icon`, `custom_tab`, `link` or `unknown` </li></ul>|2021-06-01 | |
| events.browser_menu_action |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A browser menu item was tapped  |[mozilla-mobile/fenix#1214](https://github.com/mozilla-mobile/fenix/pull/1214#issue-264756708), [mozilla-mobile/fenix#5098](https://github.com/mozilla-mobile/fenix/pull/5098#issuecomment-529658996), [mozilla-mobile/fenix#6310](https://github.com/mozilla-mobile/fenix/pull/6310), [mozilla-mobile/fenix#13958](https://github.com/mozilla-mobile/fenix/pull/13958#issuecomment-676857877), [mozilla-mobile/fenix#18143](https://github.com/mozilla-mobile/fenix/pull/18143)|<ul><li>item: A string containing the name of the item the user tapped. These items include:    Settings, Help, Desktop Site toggle on/off, Find in Page,   New Tab, Private Tab, Share, Report Site Issue, Back/Forward button,   Reload Button, Quit, Reader Mode On, Reader Mode Off, Open In app,   Add To Top Sites, Add-ons Manager, Bookmarks, History </li></ul>|2021-07-01 |2 |
| events.copy_url_tapped |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |An event that indicates that a user has selected copy option when long pressing on url bar.  |[mozilla-mobile/fenix#16915](https://github.com/mozilla-mobile/fenix/pull/16915)||2021-05-10 |2 |
| events.default_browser_changed |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |Indicates the default browser was changed  |[mozilla-mobile/fenix#18895](https://github.com/mozilla-mobile/fenix/pull/18895)||2021-10-01 |2 |
| events.entered_url |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user entered a url  |[mozilla-mobile/fenix#1067](https://github.com/mozilla-mobile/fenix/pull/1067#issuecomment-474598673), [mozilla-mobile/fenix#13958](https://github.com/mozilla-mobile/fenix/pull/13958#issuecomment-676857877), [mozilla-mobile/fenix#18143](https://github.com/mozilla-mobile/fenix/pull/18143)|<ul><li>autocomplete: A boolean that tells us whether the URL was autofilled by an Autocomplete suggestion </li></ul>|2021-07-01 |2 |
| events.opened_link |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user opened a link with Fenix  |[mozilla-mobile/fenix#5975](https://github.com/mozilla-mobile/fenix/pull/5975), [mozilla-mobile/fenix#13958](https://github.com/mozilla-mobile/fenix/pull/13958#issuecomment-676857877), [mozilla-mobile/fenix#18143](https://github.com/mozilla-mobile/fenix/pull/18143)|<ul><li>mode: The mode the link was opened in. Either 'PRIVATE' or 'NORMAL'. N.B.: this probe may be incorrectly implemented: see https://github.com/mozilla-mobile/fenix/issues/14133 </li></ul>|2021-07-01 |2 |
| events.performed_search |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user performed a search  |[mozilla-mobile/fenix#1067](https://github.com/mozilla-mobile/fenix/pull/1067#issuecomment-474598673), [mozilla-mobile/fenix#1677](https://github.com/mozilla-mobile/fenix/pull/1677), [mozilla-mobile/fenix#13958](https://github.com/mozilla-mobile/fenix/pull/13958#issuecomment-676857877), [mozilla-mobile/fenix#18143](https://github.com/mozilla-mobile/fenix/pull/18143)|<ul><li>source: A string that tells us how the user performed the search. Possible values are:  * default.action * default.suggestion * shortcut.action * shortcut.suggestion </li></ul>|2021-07-01 |2 |
| events.preference_toggled |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user toggled a boolean preference in settings  |[mozilla-mobile/fenix#1896](https://github.com/mozilla-mobile/fenix/pull/1896), [mozilla-mobile/fenix#5704](https://github.com/mozilla-mobile/fenix/pull/5704), [mozilla-mobile/fenix#5886](https://github.com/mozilla-mobile/fenix/pull/5886), [mozilla-mobile/fenix#5975](https://github.com/mozilla-mobile/fenix/pull/5975), [mozilla-mobile/fenix#6352](https://github.com/mozilla-mobile/fenix/pull/6352), [mozilla-mobile/fenix#6601](https://github.com/mozilla-mobile/fenix/pull/6601), [mozilla-mobile/fenix#6746](https://github.com/mozilla-mobile/fenix/pull/6746), [mozilla-mobile/fenix#13958](https://github.com/mozilla-mobile/fenix/pull/13958#issuecomment-676857877)|<ul><li>enabled: Whether or not the preference is *now* enabled</li><li>preference_key: The preference key for the boolean (true/false) preference the user toggled.  We currently track: show_search_suggestions, remote_debugging, telemetry, tracking_protection, search_bookmarks, search_browsing_history, show_clipboard_suggestions, show_search_shortcuts, open_links_in_a_private_tab (bug in implementation https://github.com/mozilla-mobile/fenix/issues/7384), pref_key_sync_logins, pref_key_sync_bookmarks, pref_key_sync_history, pref_key_show_voice_search, and pref_key_show_search_suggestions_in_private. </li></ul>|2021-06-01 |1, 2 |
| events.recently_closed_tabs_opened |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |An event that indicates that the user has accessed recently closed tabs list.  |[mozilla-mobile/fenix#16739](https://github.com/mozilla-mobile/fenix/pull/16739)||2021-05-10 |2 |
| events.search_bar_tapped |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user tapped the search bar  |[mozilla-mobile/fenix#1067](https://github.com/mozilla-mobile/fenix/pull/1067#issuecomment-474598673), [mozilla-mobile/fenix#13958](https://github.com/mozilla-mobile/fenix/pull/13958#issuecomment-676857877), [mozilla-mobile/fenix#18143](https://github.com/mozilla-mobile/fenix/pull/18143)|<ul><li>source: The view the user was on when they initiated the search (For example: `Home` or `Browser`) </li></ul>|2021-07-01 |2 |
| events.synced_tab_opened |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |An event that indicates that a synced tab was opened.  |[mozilla-mobile/fenix#16727](https://github.com/mozilla-mobile/fenix/pull/16727)||2021-05-10 |2 |
| events.tab_counter_menu_action |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A tab counter menu item was tapped |[mozilla-mobile/fenix#11533](https://github.com/mozilla-mobile/fenix/pull/11533), [mozilla-mobile/fenix#13958](https://github.com/mozilla-mobile/fenix/pull/13958#issuecomment-676857877), [mozilla-mobile/fenix#18143](https://github.com/mozilla-mobile/fenix/pull/18143)|<ul><li>item: A string containing the name of the item the user tapped. These items are:    New tab, New private tab, Close tab </li></ul>|2021-07-01 |2 |
| events.toolbar_menu_visible |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |The browser menu was displayed from toolbar menu  |[mozilla-mobile/fenix#18895](https://github.com/mozilla-mobile/fenix/pull/18895)||2021-10-01 |2 |
| events.whats_new_tapped |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user opened the "what's new" page button  |[mozilla-mobile/fenix#5090](https://github.com/mozilla-mobile/fenix/pull/5090), [mozilla-mobile/fenix#13958](https://github.com/mozilla-mobile/fenix/pull/13958#issuecomment-676857877), [mozilla-mobile/fenix#18143](https://github.com/mozilla-mobile/fenix/pull/18143)||2021-07-01 |2 |
| experiments_default_browser.toolbar_menu_clicked |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |Set default browser was clicked from toolbar menu  |[mozilla-mobile/fenix#18895](https://github.com/mozilla-mobile/fenix/pull/18895)||2021-10-01 |2 |
| find_in_page.closed |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user closed the find in page UI  |[mozilla-mobile/fenix#1344](https://github.com/mozilla-mobile/fenix/pull/1344#issuecomment-479285010), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
| find_in_page.opened |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user opened the find in page UI  |[mozilla-mobile/fenix#1344](https://github.com/mozilla-mobile/fenix/pull/1344#issuecomment-479285010), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
| find_in_page.searched_page |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user searched the page  |[mozilla-mobile/fenix#1344](https://github.com/mozilla-mobile/fenix/pull/1344#issuecomment-479285010), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
| history.opened |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user opened the history screen  |[mozilla-mobile/fenix#3940](https://github.com/mozilla-mobile/fenix/pull/3940), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
| history.opened_item |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user opened a history item  |[mozilla-mobile/fenix#18261](https://github.com/mozilla-mobile/fenix/pull/18261)||2022-08-01 |2 |
| history.opened_item_in_new_tab |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user opened a history item in a new tab  |[mozilla-mobile/fenix#18261](https://github.com/mozilla-mobile/fenix/pull/18261)||2022-08-01 |2 |
| history.opened_item_in_private_tab |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user opened a history item in a private tab  |[mozilla-mobile/fenix#18261](https://github.com/mozilla-mobile/fenix/pull/18261)||2022-08-01 |2 |
| history.opened_items_in_new_tabs |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user opened multiple history items in new tabs  |[Review 1](https://gith ub.com/mozilla-mobile/fenix/pull/18261)||2022-08-01 |2 |
| history.opened_items_in_private_tabs |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user opened multiple history items in private tabs  |[mozilla-mobile/fenix#18261](https://github.com/mozilla-mobile/fenix/pull/18261)||2022-08-01 |2 |
| history.removed |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user removed a history item  |[mozilla-mobile/fenix#3940](https://github.com/mozilla-mobile/fenix/pull/3940), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
| history.removed_all |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user removed all history items  |[mozilla-mobile/fenix#3940](https://github.com/mozilla-mobile/fenix/pull/3940), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
| history.shared |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user shared a history item  |[mozilla-mobile/fenix#3940](https://github.com/mozilla-mobile/fenix/pull/3940), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
| home_menu.settings_item_clicked |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |The user clicked the settings option in home menu. |[mozilla-mobile/fenix#18987](https://github.com/mozilla-mobile/fenix/pull/18987)||2021-10-01 |2 |
| home_screen.home_screen_displayed |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |The user clicked the settings option in home menu. |[mozilla-mobile/fenix#19025](https://github.com/mozilla-mobile/fenix/pull/19025)||2021-10-01 |2 |
| login_dialog.cancelled |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |The login dialog prompt was cancelled  |[mozilla-mobile/fenix#13050](https://github.com/mozilla-mobile/fenix/pull/13050)||2021-08-01 |2 |
| login_dialog.displayed |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |The login dialog prompt was displayed  |[mozilla-mobile/fenix#13050](https://github.com/mozilla-mobile/fenix/pull/13050)||2021-08-01 |2 |
| login_dialog.never_save |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |The login dialog prompt "never save" button was pressed  |[mozilla-mobile/fenix#13050](https://github.com/mozilla-mobile/fenix/pull/13050)||2021-08-01 |2 |
| login_dialog.saved |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |The login dialog prompt "save" button was pressed  |[mozilla-mobile/fenix#13050](https://github.com/mozilla-mobile/fenix/pull/13050)||2021-08-01 |2 |
| logins.copy_login |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user copied a piece of a login in saved logins  |[mozilla-mobile/fenix#6352](https://github.com/mozilla-mobile/fenix/pull/6352), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
| logins.delete_saved_login |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user confirms delete of a saved login  |[mozilla-mobile/fenix/issues/11208](https://github.com/mozilla-mobile/fenix/issues/11208), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
| logins.open_individual_login |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user accessed an individual login in saved logins  |[mozilla-mobile/fenix#6352](https://github.com/mozilla-mobile/fenix/pull/6352), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
| logins.open_login_editor |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user entered the edit screen for an individual saved login  |[mozilla-mobile/fenix/issues/11208](https://github.com/mozilla-mobile/fenix/issues/11208), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
| logins.open_logins |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user accessed Logins in Settings  |[mozilla-mobile/fenix#6352](https://github.com/mozilla-mobile/fenix/pull/6352), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
| logins.save_edited_login |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user saves changes made to an individual login  |[mozilla-mobile/fenix/issues/11208](https://github.com/mozilla-mobile/fenix/issues/11208), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
| logins.save_logins_setting_changed |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user changed their setting for asking to save logins  |[mozilla-mobile/fenix#7767](https://github.com/mozilla-mobile/fenix/pull/7767), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)|<ul><li>setting: The new setting for saving logins the user selected. Either `ask_to_save` or `never_save` </li></ul>|2021-08-01 |2 |
| logins.view_password_login |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user viewed a password in an individual saved login  |[mozilla-mobile/fenix#6352](https://github.com/mozilla-mobile/fenix/pull/6352), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
| master_password.displayed |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |The master password migration dialog was displayed  |[mozilla-mobile/fenix#14468](https://github.com/mozilla-mobile/fenix/pull/14468#issuecomment-684114534), [mozilla-mobile/fenix#18071](https://github.com/mozilla-mobile/fenix/pull/18071)||2021-09-01 |2 |
| master_password.migration |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |Logins were successfully migrated using a master password.  |[mozilla-mobile/fenix#14468](https://github.com/mozilla-mobile/fenix/pull/14468#issuecomment-684114534), [mozilla-mobile/fenix#18071](https://github.com/mozilla-mobile/fenix/pull/18071)||2021-09-01 |2 |
| media_notification.pause |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user pressed the pause icon on the media notification  |[mozilla-mobile/fenix#5520](https://github.com/mozilla-mobile/fenix/pull/5520), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
| media_notification.play |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user pressed the play icon on the media notification  |[mozilla-mobile/fenix#5520](https://github.com/mozilla-mobile/fenix/pull/5520), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
| media_state.fullscreen |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |Video set to fullscreen.  |[mozilla-mobile/fenix#16833](https://github.com/mozilla-mobile/fenix/pull/16833)||2021-08-01 |2 |
| media_state.pause |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |Media playback was paused.  |[mozilla-mobile/fenix#6463](https://github.com/mozilla-mobile/fenix/pull/6463), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
| media_state.picture_in_picture |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |Video set to picture in picture mode.  |[mozilla-mobile/fenix#16833](https://github.com/mozilla-mobile/fenix/pull/16833)||2021-08-01 |2 |
| media_state.play |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |Media started playing.  |[mozilla-mobile/fenix#6463](https://github.com/mozilla-mobile/fenix/pull/6463), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
| media_state.stop |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |Media playback has ended.  |[mozilla-mobile/fenix#6463](https://github.com/mozilla-mobile/fenix/pull/6463), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
| onboarding.finish |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |The user taps starts browsing and ends the onboarding experience. |[mozilla-mobile/fenix#11867](https://github.com/mozilla-mobile/fenix/pull/11867), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
| onboarding.fxa_auto_signin |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |The onboarding automatic sign in card was tapped. |[mozilla-mobile/fenix#11867](https://github.com/mozilla-mobile/fenix/pull/11867), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
| onboarding.fxa_manual_signin |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |The onboarding manual sign in card was tapped. |[mozilla-mobile/fenix#11867](https://github.com/mozilla-mobile/fenix/pull/11867), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
| onboarding.pref_toggled_private_browsing |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |The private browsing preference was selected from the onboarding card. |[mozilla-mobile/fenix#11867](https://github.com/mozilla-mobile/fenix/pull/11867), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
| onboarding.pref_toggled_theme_picker |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |The device theme was chosen using the theme picker onboarding card. |[mozilla-mobile/fenix#11867](https://github.com/mozilla-mobile/fenix/pull/11867), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)|<ul><li>theme: A string that indicates the theme LIGHT, DARK, or FOLLOW DEVICE. Default: FOLLOW DEVICE </li></ul>|2021-08-01 |2 |
| onboarding.pref_toggled_toolbar_position |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |The toolbar position preference was chosen from the onboarding card. |[mozilla-mobile/fenix#11867](https://github.com/mozilla-mobile/fenix/pull/11867), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)|<ul><li>position: A string that indicates the position of the toolbar TOP or BOTTOM. Default: BOTTOM </li></ul>|2021-08-01 |2 |
| onboarding.pref_toggled_tracking_prot |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |The tracking protection preference was chosen from the onboarding card. |[mozilla-mobile/fenix#11867](https://github.com/mozilla-mobile/fenix/pull/11867), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)|<ul><li>setting: A string that indicates the Tracking Protection policy STANDARD or STRICT. Default: Toggle ON, STANDARD </li></ul>|2021-08-01 |2 |
| onboarding.privacy_notice |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |The onboarding privacy notice card was tapped. |[mozilla-mobile/fenix#11867](https://github.com/mozilla-mobile/fenix/pull/11867), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
| pocket.pocket_top_site_clicked |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user clicked on the trending Pocket top site  |[mozilla-mobile/fenix#8098](https://github.com/mozilla-mobile/fenix/pull/8098), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
| pocket.pocket_top_site_removed |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user removed the trending Pocket top site  |[mozilla-mobile/fenix#8098](https://github.com/mozilla-mobile/fenix/pull/8098), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
| private_browsing_mode.notification_tapped |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user pressed the private browsing mode notification itself.  |[mozilla-mobile/fenix#4968](https://github.com/mozilla-mobile/fenix/pull/4968), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
| private_browsing_mode.snackbar_undo |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user pressed the "undo" button in the snackbar that is shown when the garbage icon is tapped.  |[mozilla-mobile/fenix#4968](https://github.com/mozilla-mobile/fenix/pull/4968), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
| private_browsing_shortcut.cfr_add_shortcut |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user pressed the "Add shortcut" button when the contextual feature recommender appeared.  |[mozilla-mobile/fenix#5194](https://github.com/mozilla-mobile/fenix/pull/5194), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
| private_browsing_shortcut.cfr_cancel |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user pressed the "No thanks" button when the contextual feature recommender appeared.  |[mozilla-mobile/fenix#5194](https://github.com/mozilla-mobile/fenix/pull/5194), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
| private_browsing_shortcut.create_shortcut |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user pressed the "Add private browsing shortcut" button in settings.  |[mozilla-mobile/fenix#5194](https://github.com/mozilla-mobile/fenix/pull/5194), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
| private_browsing_shortcut.pinned_shortcut_priv |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user pressed the pinned private shortcut in Android home screen, opening up a new private search.  |[mozilla-mobile/fenix#5194](https://github.com/mozilla-mobile/fenix/pull/5194), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
| private_browsing_shortcut.static_shortcut_priv |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user pressed the long-press shortcut "Open new private tab", opening up a new private search.  |[mozilla-mobile/fenix#5194](https://github.com/mozilla-mobile/fenix/pull/5194), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
| private_browsing_shortcut.static_shortcut_tab |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user pressed the long-press shortcut "Open new tab", opening up a new search.  |[mozilla-mobile/fenix#5194](https://github.com/mozilla-mobile/fenix/pull/5194), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
| progressive_web_app.background |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user puts the PWA into the background.  |[mozilla-mobile/fenix#11859](https://github.com/mozilla-mobile/fenix/pull/11859), [mozilla-mobile/fenix#18071](https://github.com/mozilla-mobile/fenix/pull/18071)|<ul><li>time_ms: The current time in ms when the PWA was backgrounded. </li></ul>|2021-09-01 |2 |
| progressive_web_app.foreground |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user brings the PWA into the foreground.  |[mozilla-mobile/fenix#11859](https://github.com/mozilla-mobile/fenix/pull/11859), [mozilla-mobile/fenix#18071](https://github.com/mozilla-mobile/fenix/pull/18071)|<ul><li>time_ms: The current time in ms when the PWA was brought to the foreground. </li></ul>|2021-09-01 |2 |
| progressive_web_app.homescreen_tap |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user taps on PWA homescreen icon  |[mozilla-mobile/fenix#11859](https://github.com/mozilla-mobile/fenix/pull/11859), [mozilla-mobile/fenix#18071](https://github.com/mozilla-mobile/fenix/pull/18071)||2021-09-01 |2 |
| progressive_web_app.install_tap |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user installs a PWA. Could be a shortcut or added to homescreen.  |[mozilla-mobile/fenix#11859](https://github.com/mozilla-mobile/fenix/pull/11859), [mozilla-mobile/fenix#18071](https://github.com/mozilla-mobile/fenix/pull/18071)||2021-09-01 |2 |
| reader_mode.appearance |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user tapped the appearance button  |[mozilla-mobile/fenix#3941](https://github.com/mozilla-mobile/fenix/pull/3941), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
| reader_mode.available |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |Reader mode is available for the current page  |[mozilla-mobile/fenix#3941](https://github.com/mozilla-mobile/fenix/pull/3941), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
| reader_mode.closed |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user closed reader mode  |[mozilla-mobile/fenix#4328](https://github.com/mozilla-mobile/fenix/pull/4328), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
| reader_mode.opened |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user opened reader mode  |[mozilla-mobile/fenix#3941](https://github.com/mozilla-mobile/fenix/pull/3941), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
| search_shortcuts.selected |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user selected a search shortcut engine to use  |[mozilla-mobile/fenix#1202](https://github.com/mozilla-mobile/fenix/pull/1202#issuecomment-476870449), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)|<ul><li>engine: The name of the built-in search engine the user selected as a string </li></ul>|2021-08-01 | |
| search_suggestions.enable_in_private |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user enabled receiving search suggestions in private sessions  |[mozilla-mobile/fenix#6746](https://github.com/mozilla-mobile/fenix/pull/6746), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |1, 2 |
| search_widget.new_tab_button |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user pressed anywhere from the Firefox logo until the start of the microphone icon, opening a new tab search screen.  |[mozilla-mobile/fenix#4714](https://github.com/mozilla-mobile/fenix/pull/4714), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
| search_widget.voice_button |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user pressed the microphone icon, opening a new voice search screen.  |[mozilla-mobile/fenix#4714](https://github.com/mozilla-mobile/fenix/pull/4714), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
| set_default_newtab_experiment.close_experiment_card_clicked |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |Close experiment card was clicked from new tab screen.  |[mozilla-mobile/fenix#18895](https://github.com/mozilla-mobile/fenix/pull/18895)||2021-10-01 |2 |
| set_default_newtab_experiment.set_default_browser_clicked |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |Set default browser was clicked from new tab screen.  |[mozilla-mobile/fenix#18895](https://github.com/mozilla-mobile/fenix/pull/18895)||2021-10-01 |2 |
| sync_account.opened |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user opened the sync account page  |[mozilla-mobile/fenix#2745](https://github.com/mozilla-mobile/fenix/pull/2745#issuecomment-494918532), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
| sync_account.send_tab |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user sent the current tab to another FxA device  |[mozilla-mobile/fenix#5106](https://github.com/mozilla-mobile/fenix/pull/5106), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
| sync_account.sign_in_to_send_tab |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user pressed the "sign in to send tab" button inside the share tab menu  |[mozilla-mobile/fenix#5106](https://github.com/mozilla-mobile/fenix/pull/5106), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
| sync_account.sync_now |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user pressed the sync now button on the sync account page  |[mozilla-mobile/fenix#2745](https://github.com/mozilla-mobile/fenix/pull/2745#issuecomment-494918532), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
| sync_auth.closed |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user closed the sync page  |[mozilla-mobile/fenix#2745](https://github.com/mozilla-mobile/fenix/pull/2745#issuecomment-494918532), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
| sync_auth.opened |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user opened the sync authentication page  |[mozilla-mobile/fenix#2745](https://github.com/mozilla-mobile/fenix/pull/2745#issuecomment-494918532), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
| sync_auth.other_external |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |User authenticated via FxA using an unknown mechanism. "Known" mechanisms are currently sign-in, sign-up and pairing  |[mozilla-mobile/fenix#4931](https://github.com/mozilla-mobile/fenix/pull/4931#issuecomment-529740300), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |1, 2 |
| sync_auth.paired |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |User signed into FxA by pairing with a different Firefox browser, using a QR code  |[mozilla-mobile/fenix#4931](https://github.com/mozilla-mobile/fenix/pull/4931#issuecomment-529740300), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |1, 2 |
| sync_auth.recovered |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |Account manager automatically recovered FxA authentication state without direct user involvement  |[mozilla-mobile/fenix#4931](https://github.com/mozilla-mobile/fenix/pull/4931#issuecomment-529740300), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |1, 2 |
| sync_auth.scan_pairing |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user pressed the scan pairing button on the sync authentication page  |[mozilla-mobile/fenix#2745](https://github.com/mozilla-mobile/fenix/pull/2745#issuecomment-494918532), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
| sync_auth.sign_in |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user pressed the sign in button on the sync authentication page and was successfully signed in to FxA  |[mozilla-mobile/fenix#2745](https://github.com/mozilla-mobile/fenix/pull/2745#issuecomment-494918532), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
| sync_auth.sign_out |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user pressed the sign out button on the sync account page and was successfully signed out of FxA  |[mozilla-mobile/fenix#2745](https://github.com/mozilla-mobile/fenix/pull/2745#issuecomment-494918532), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
| sync_auth.sign_up |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |User registered a new Firefox Account, and was signed into it  |[mozilla-mobile/fenix#4931](https://github.com/mozilla-mobile/fenix/pull/4931#issuecomment-529740300), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |1, 2 |
| sync_auth.use_email |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user chose to use their email to sign in instead of scanning a QR code, counterpart to "scan_pairing"  |[mozilla-mobile/fenix#9835](https://github.com/mozilla-mobile/fenix/pull/9835#pullrequestreview-398641844), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
| sync_auth.use_email_problem |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user chose to use their email to sign in after an account problem  |[mozilla-mobile/fenix#9835](https://github.com/mozilla-mobile/fenix/pull/9835#pullrequestreview-398641844), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
| synced_tabs.synced_tabs_suggestion_clicked |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |The synced tab suggestion in awesomebar was clicked.  |[mozilla-mobile/fenix#18172](https://github.com/mozilla-mobile/fenix/pull/18172)||2021-08-01 |2 |
| tab.media_pause |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user pressed the pause icon on a tab from the home screen  |[mozilla-mobile/fenix#5266](https://github.com/mozilla-mobile/fenix/pull/5266), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
| tab.media_play |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user pressed the play icon on a tab from the home screen  |[mozilla-mobile/fenix#5266](https://github.com/mozilla-mobile/fenix/pull/5266), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
| tabs.setting_opened |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |The tab settings were opened.  |[mozilla-mobile/fenix#15811](https://github.com/mozilla-mobile/fenix/pull/15811#issuecomment-706402952)||2021-08-01 |2 |
| tabs_tray.cfr.dismiss |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user dismisses the tabs tray CFR.  |[mozilla-mobile/fenix#17442](https://github.com/mozilla-mobile/fenix/pull/17442), [mozilla-mobile/fenix/issues/16485](https://github.com/mozilla-mobile/fenix/issues/16485#issuecomment-759641324)||2021-08-01 |2 |
| tabs_tray.cfr.go_to_settings |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user selects the CFR option to navigate to settings.  |[mozilla-mobile/fenix#17442](https://github.com/mozilla-mobile/fenix/pull/17442), [mozilla-mobile/fenix/issues/16485](https://github.com/mozilla-mobile/fenix/issues/16485#issuecomment-759641324)||2021-08-01 |2 |
| tabs_tray.close_all_tabs |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user tapped the close all tabs button in the three dot menu within the tabs tray  |[mozilla-mobile/fenix#12036](https://github.com/mozilla-mobile/fenix/pull/12036), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
| tabs_tray.closed |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user closed the tabs tray  |[mozilla-mobile/fenix#12036](https://github.com/mozilla-mobile/fenix/pull/12036), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
| tabs_tray.closed_existing_tab |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user closed an existing tab  |[mozilla-mobile/fenix#12036](https://github.com/mozilla-mobile/fenix/pull/12036), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
| tabs_tray.menu_opened |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user opened three three dot menu in the tabs tray  |[mozilla-mobile/fenix#12036](https://github.com/mozilla-mobile/fenix/pull/12036), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
| tabs_tray.new_private_tab_tapped |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user opened a new private tab  |[mozilla-mobile/fenix#12036](https://github.com/mozilla-mobile/fenix/pull/12036), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
| tabs_tray.new_tab_tapped |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user opened a new tab  |[mozilla-mobile/fenix#12036](https://github.com/mozilla-mobile/fenix/pull/12036), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
| tabs_tray.normal_mode_tapped |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user switched to normal mode  |[mozilla-mobile/fenix#12036](https://github.com/mozilla-mobile/fenix/pull/12036), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
| tabs_tray.opened |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user opened the tabs tray  |[mozilla-mobile/fenix#12036](https://github.com/mozilla-mobile/fenix/pull/12036), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
| tabs_tray.opened_existing_tab |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user opened an existing tab  |[mozilla-mobile/fenix#12036](https://github.com/mozilla-mobile/fenix/pull/12036), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
| tabs_tray.private_mode_tapped |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user switched to private mode  |[mozilla-mobile/fenix#12036](https://github.com/mozilla-mobile/fenix/pull/12036), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
| tabs_tray.save_to_collection |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user tapped the save to collection button in the tabs tray  |[mozilla-mobile/fenix#12036](https://github.com/mozilla-mobile/fenix/pull/12036), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
| tabs_tray.share_all_tabs |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user tapped the share all tabs button in the three dot menu within the tabs tray  |[mozilla-mobile/fenix#12036](https://github.com/mozilla-mobile/fenix/pull/12036), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
| tabs_tray.synced_mode_tapped |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user switched to synced mode  |[mozilla-mobile/fenix#19004](https://github.com/mozilla-mobile/fenix/pull/19004)||2022-08-01 |2 |
| tip.closed |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |The tip was closed  |[mozilla-mobile/fenix#9836](https://github.com/mozilla-mobile/fenix/pull/9836), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)|<ul><li>identifier: The identifier of the tip closed</li></ul>|2021-08-01 |2 |
| tip.displayed |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |The tip was displayed  |[mozilla-mobile/fenix#9836](https://github.com/mozilla-mobile/fenix/pull/9836), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)|<ul><li>identifier: The identifier of the tip displayed</li></ul>|2021-08-01 |2 |
| tip.pressed |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |The tip's button was pressed  |[mozilla-mobile/fenix#9836](https://github.com/mozilla-mobile/fenix/pull/9836), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)|<ul><li>identifier: The identifier of the tip the action was taken on</li></ul>|2021-08-01 |2 |
| toolbar_settings.changed_position |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |The user selected a new position for the toolbar  |[mozilla-mobile/fenix#6608](https://github.com/mozilla-mobile/fenix/pull/6608), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)|<ul><li>position: A string that indicates the new position of the toolbar TOP or BOTTOM </li></ul>|2021-08-01 |2 |
| top_sites.long_press |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user long pressed on a top site  |[mozilla-mobile/fenix#15136](https://github.com/mozilla-mobile/fenix/pull/15136), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)|<ul><li>type: The type of top site. Options are: "FRECENCY," "DEFAULT," or "PINNED." </li></ul>|2021-08-01 |2 |
| top_sites.open_default |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user opened a default top site  |[mozilla-mobile/fenix#10752](https://github.com/mozilla-mobile/fenix/pull/10752), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
| top_sites.open_frecency |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user opened a frecency top site  |[mozilla-mobile/fenix#15136](https://github.com/mozilla-mobile/fenix/pull/15136), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
| top_sites.open_google_search_attribution |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user opened the google top site  |[mozilla-mobile/fenix#17637](https://github.com/mozilla-mobile/fenix/pull/17637)||2021-08-01 |2 |
| top_sites.open_in_new_tab |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user opens a new tab based on a top site item  |[mozilla-mobile/fenix#7523](https://github.com/mozilla-mobile/fenix/pull/7523), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
| top_sites.open_in_private_tab |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user opens a new private tab based on a top site item  |[mozilla-mobile/fenix#7523](https://github.com/mozilla-mobile/fenix/pull/7523), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
| top_sites.open_pinned |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user opened a pinned top site  |[mozilla-mobile/fenix#15136](https://github.com/mozilla-mobile/fenix/pull/15136), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
| top_sites.remove |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user removes a top site item  |[mozilla-mobile/fenix#7523](https://github.com/mozilla-mobile/fenix/pull/7523), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
| top_sites.swipe_carousel |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user swiped to change the page of the top sites carousel  |[mozilla-mobile/fenix#15136](https://github.com/mozilla-mobile/fenix/pull/15136), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)|<ul><li>page: The page number the carousel is now on </li></ul>|2021-08-01 |2 |
| tracking_protection.etp_setting_changed |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user changed their tracking protection level setting to either strict, standard, or custom.  |[mozilla-mobile/fenix#5414](https://github.com/mozilla-mobile/fenix/pull/5414#issuecomment-532847188), [mozilla-mobile/fenix#11383](https://github.com/mozilla-mobile/fenix/pull/11383), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)|<ul><li>etp_setting: The new setting for ETP: strict, standard, custom</li></ul>|2021-08-01 |2 |
| tracking_protection.etp_settings |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user opened tracking protection settings through settings.  |[mozilla-mobile/fenix#5414](https://github.com/mozilla-mobile/fenix/pull/5414#issuecomment-532847188), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
| tracking_protection.etp_shield |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user pressed the tracking protection shield icon in toolbar.  |[mozilla-mobile/fenix#5414](https://github.com/mozilla-mobile/fenix/pull/5414#issuecomment-532847188), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
| tracking_protection.etp_tracker_list |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user pressed into a list of categorized trackers in tracking protection panel.  |[mozilla-mobile/fenix#5414](https://github.com/mozilla-mobile/fenix/pull/5414#issuecomment-532847188), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
| tracking_protection.exception_added |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user added a tracking protection exception through the TP toggle in the panel.  |[mozilla-mobile/fenix#5414](https://github.com/mozilla-mobile/fenix/pull/5414#issuecomment-532847188), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
| tracking_protection.panel_settings |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user opened tracking protection settings from the panel.  |[mozilla-mobile/fenix#5414](https://github.com/mozilla-mobile/fenix/pull/5414#issuecomment-532847188), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
| user_specified_search_engines.custom_engine_added |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user added a new custom search engine  |[mozilla-mobile/fenix#6918](https://github.com/mozilla-mobile/fenix/pull/6918), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
| user_specified_search_engines.custom_engine_deleted |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user deleted a custom search engine  |[mozilla-mobile/fenix#6918](https://github.com/mozilla-mobile/fenix/pull/6918), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
| voice_search.tapped |[event](https://mozilla.github.io/glean/book/user/metrics/event.html) |A user selected the voice search button on the search screen.  |[mozilla-mobile/fenix#10785](https://github.com/mozilla-mobile/fenix/pull/10785), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |

## first-session

This ping is intended to capture the source of the app install
on the first session.


This ping includes the [client id](https://mozilla.github.io/glean/book/user/pings/index.html#the-client_info-section).

**Data reviews for this ping:**

- <https://github.com/mozilla-mobile/fenix/pull/8074#issuecomment-586512202>

**Bugs related to this ping:**

- <https://github.com/mozilla-mobile/fenix/issues/7295>

All Glean pings contain built-in metrics in the [`ping_info`](https://mozilla.github.io/glean/book/user/pings/index.html#the-ping_info-section) and [`client_info`](https://mozilla.github.io/glean/book/user/pings/index.html#the-client_info-section) sections.

In addition to those built-in metrics, the following metrics are added to the ping:

| Name | Type | Description | Data reviews | Extras | Expiration | [Data Sensitivity](https://wiki.mozilla.org/Firefox/Data_Collection) |
| --- | --- | --- | --- | --- | --- | --- |
| first_session.adgroup |[string](https://mozilla.github.io/glean/book/user/metrics/string.html) |The name of the AdGroup that was used to source this installation.  |[mozilla-mobile/fenix#8074](https://github.com/mozilla-mobile/fenix/pull/8074#issuecomment-586480836), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |1, 2 |
| first_session.campaign |[string](https://mozilla.github.io/glean/book/user/metrics/string.html) |The name of the campaign that is responsible for this installation.  |[mozilla-mobile/fenix#8074](https://github.com/mozilla-mobile/fenix/pull/8074#issuecomment-586512202), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |1, 2 |
| first_session.creative |[string](https://mozilla.github.io/glean/book/user/metrics/string.html) |The identifier of the creative material that the user interacted with.  |[mozilla-mobile/fenix#8074](https://github.com/mozilla-mobile/fenix/pull/8074#issuecomment-586512202), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |1, 2 |
| first_session.network |[string](https://mozilla.github.io/glean/book/user/metrics/string.html) |The name of the Network that sourced this installation.  |[mozilla-mobile/fenix#8074](https://github.com/mozilla-mobile/fenix/pull/8074#issuecomment-586512202), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |1, 2 |
| first_session.timestamp |[datetime](https://mozilla.github.io/glean/book/user/metrics/datetime.html) |The Glean generated date and time of the installation. This is unique per app install, though the rest of the data in this ping is from Adjust and will remain static across installs.  |[mozilla-mobile/fenix#8074](https://github.com/mozilla-mobile/fenix/pull/8074#issuecomment-586512202), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |1, 2 |

## metrics

This is a built-in ping that is assembled out of the box by the Glean SDK.

See the Glean SDK documentation for the [`metrics` ping](https://mozilla.github.io/glean/book/user/pings/metrics.html).

All Glean pings contain built-in metrics in the [`ping_info`](https://mozilla.github.io/glean/book/user/pings/index.html#the-ping_info-section) and [`client_info`](https://mozilla.github.io/glean/book/user/pings/index.html#the-client_info-section) sections.

In addition to those built-in metrics, the following metrics are added to the ping:

| Name | Type | Description | Data reviews | Extras | Expiration | [Data Sensitivity](https://wiki.mozilla.org/Firefox/Data_Collection) |
| --- | --- | --- | --- | --- | --- | --- |
| addons.enabled_addons |[string_list](https://mozilla.github.io/glean/book/user/metrics/string_list.html) |A list of all enabled add-ons on the device.  |[mozilla-mobile/fenix#11080](https://github.com/mozilla-mobile/fenix/pull/11080), [mozilla-mobile/fenix#13958](https://github.com/mozilla-mobile/fenix/pull/13958#issuecomment-676857877), [mozilla-mobile/fenix#18143](https://github.com/mozilla-mobile/fenix/pull/18143)||2021-07-01 |2 |
| addons.has_enabled_addons |[boolean](https://mozilla.github.io/glean/book/user/metrics/boolean.html) |Whether or not the user has enabled add-ons on the device.  |[mozilla-mobile/fenix#8318](https://github.com/mozilla-mobile/fenix/pull/8318), [mozilla-mobile/fenix#13958](https://github.com/mozilla-mobile/fenix/pull/13958#issuecomment-676857877), [mozilla-mobile/fenix#18143](https://github.com/mozilla-mobile/fenix/pull/18143)||2021-07-01 |2 |
| addons.has_installed_addons |[boolean](https://mozilla.github.io/glean/book/user/metrics/boolean.html) |Whether or not the user has installed add-ons on the device.  |[mozilla-mobile/fenix#8318](https://github.com/mozilla-mobile/fenix/pull/8318), [mozilla-mobile/fenix#13958](https://github.com/mozilla-mobile/fenix/pull/13958#issuecomment-676857877), [mozilla-mobile/fenix#18143](https://github.com/mozilla-mobile/fenix/pull/18143)||2021-07-01 |2 |
| addons.installed_addons |[string_list](https://mozilla.github.io/glean/book/user/metrics/string_list.html) |A list of all installed add-ons on the device.  |[mozilla-mobile/fenix#11080](https://github.com/mozilla-mobile/fenix/pull/11080), [mozilla-mobile/fenix#13958](https://github.com/mozilla-mobile/fenix/pull/13958#issuecomment-676857877), [mozilla-mobile/fenix#18143](https://github.com/mozilla-mobile/fenix/pull/18143)||2021-07-01 |2 |
| browser.search.ad_clicks |[labeled_counter](https://mozilla.github.io/glean/book/user/metrics/labeled_counters.html) |Records clicks of adverts on SERP pages. The key format is ‘<provider-name>’.  |[mozilla-mobile/fenix#10112](https://github.com/mozilla-mobile/fenix/pull/10112), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
| browser.search.in_content |[labeled_counter](https://mozilla.github.io/glean/book/user/metrics/labeled_counters.html) |Records the type of interaction a user has on SERP pages.  |[mozilla-mobile/fenix#10167](https://github.com/mozilla-mobile/fenix/pull/10167), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
| browser.search.with_ads |[labeled_counter](https://mozilla.github.io/glean/book/user/metrics/labeled_counters.html) |Records counts of SERP pages with adverts displayed. The key format is ‘<provider-name>’.  |[mozilla-mobile/fenix#10112](https://github.com/mozilla-mobile/fenix/pull/10112), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
| engine_tab.kill_background_age |[timing_distribution](https://mozilla.github.io/glean/book/user/metrics/timing_distribution.html) |Measures the age of the engine session of a background tab at the time its content process got killed.  |[mozilla-mobile/fenix#17864](https://github.com/mozilla-mobile/fenix/pull/17864)||2021-12-31 |1 |
| engine_tab.kill_foreground_age |[timing_distribution](https://mozilla.github.io/glean/book/user/metrics/timing_distribution.html) |Measures the age of the engine session of a foreground (selected) tab at the time its content process got killed.  |[mozilla-mobile/fenix#17864](https://github.com/mozilla-mobile/fenix/pull/17864)||2021-12-31 |1 |
| engine_tab.kills |[labeled_counter](https://mozilla.github.io/glean/book/user/metrics/labeled_counters.html) |How often was the content process of a foreground (selected) or background tab killed.  |[mozilla-mobile/fenix#17864](https://github.com/mozilla-mobile/fenix/pull/17864)|<ul><li>foreground</li><li>background</li></ul>|2021-12-31 |1 |
| events.normal_and_private_uri_count |[counter](https://mozilla.github.io/glean/book/user/metrics/counter.html) |A counter of URIs visited by the user in the current session, including page reloads. This includes private browsing.  This does not include background page requests and URIs from embedded pages but may be incremented without user interaction by website scripts that programmatically redirect to a new location.  |[mozilla-mobile/fenix#17935](https://github.com/mozilla-mobile/fenix/pull/17935)||2022-08-01 |2 |
| events.total_uri_count |[counter](https://mozilla.github.io/glean/book/user/metrics/counter.html) |A counter of URIs visited by the user in the current session, including page reloads. This does not include background page requests and URIs from embedded pages or private browsing but may be incremented without user interaction by website scripts that programmatically redirect to a new location.  |[mozilla-mobile/fenix#1785](https://github.com/mozilla-mobile/fenix/pull/1785), [mozilla-mobile/fenix#8314](https://github.com/mozilla-mobile/fenix/pull/8314), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
| metrics.adjust_ad_group |[string](https://mozilla.github.io/glean/book/user/metrics/string.html) |A string containing the Adjust ad group ID from which the user installed Fenix. This will not send on the first session the user runs. If the install is organic, this will be empty.  |[mozilla-mobile/fenix#9253](https://github.com/mozilla-mobile/fenix/pull/9253), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
| metrics.adjust_campaign |[string](https://mozilla.github.io/glean/book/user/metrics/string.html) |A string containing the Adjust campaign ID from which the user installed Fenix. This will not send on the first session the user runs. If the install is organic, this will be empty.  |[mozilla-mobile/fenix#5579](https://github.com/mozilla-mobile/fenix/pull/5579), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |1 |
| metrics.adjust_creative |[string](https://mozilla.github.io/glean/book/user/metrics/string.html) |A string containing the Adjust creative ID from which the user installed Fenix. This will not send on the first session the user runs. If the install is organic, this will be empty.  |[mozilla-mobile/fenix#9253](https://github.com/mozilla-mobile/fenix/pull/9253), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
| metrics.adjust_network |[string](https://mozilla.github.io/glean/book/user/metrics/string.html) |A string containing the Adjust network ID from which the user installed Fenix. This will not send on the first session the user runs. If the install is organic, this will be empty.  |[mozilla-mobile/fenix#9253](https://github.com/mozilla-mobile/fenix/pull/9253), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
| metrics.close_tab_setting |[string](https://mozilla.github.io/glean/book/user/metrics/string.html) |A string that indicates the setting for tab closing: MANUAL, ONE_DAY, ONE_WEEK, ONE_MONTH  |[mozilla-mobile/fenix#15811](https://github.com/mozilla-mobile/fenix/pull/15811#issuecomment-706402952)||2021-08-01 |2 |
| metrics.default_browser |[boolean](https://mozilla.github.io/glean/book/user/metrics/boolean.html) |Is Fenix the default browser?  |[mozilla-mobile/fenix#1067](https://github.com/mozilla-mobile/fenix/pull/1067#issuecomment-474598673), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
| metrics.default_moz_browser |[string](https://mozilla.github.io/glean/book/user/metrics/string.html) |The name of the default browser on device if and only if it's a Mozilla owned product  |[mozilla-mobile/fenix#1953/](https://github.com/mozilla-mobile/fenix/pull/1953/), [mozilla-mobile/fenix#5216](https://github.com/mozilla-mobile/fenix/pull/5216), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |1, 2 |
| metrics.desktop_bookmarks_count |[counter](https://mozilla.github.io/glean/book/user/metrics/counter.html) |A counter that indicates how many bookmarks a user has in the desktop folder. This value will only be set if the user has at least *one* bookmark. If they have 0, this ping will not get sent, resulting in a null value. To disambiguate between a failed `desktop_bookmarks_count` ping and 0 bookmarks, please see `has_desktop_bookmarks`.  |[mozilla-mobile/fenix#16942](https://github.com/mozilla-mobile/fenix/pull/16942), [mozilla-mobile/fenix#16942](https://github.com/mozilla-mobile/fenix/pull/16942#issuecomment-742794701)||2021-08-01 |2 |
| metrics.distribution_id |[string](https://mozilla.github.io/glean/book/user/metrics/string.html) |A string containing the distribution identifier. This is currently used to identify installs from Mozilla Online.  |[mozilla-mobile/fenix/issues/16075](https://github.com/mozilla-mobile/fenix/issues/16075)||never |1 |
| metrics.has_desktop_bookmarks |[boolean](https://mozilla.github.io/glean/book/user/metrics/boolean.html) |A boolean that indicates if the user has bookmarks in the desktop folder  |[mozilla-mobile/fenix#16942](https://github.com/mozilla-mobile/fenix/pull/16942), [mozilla-mobile/fenix#16942](https://github.com/mozilla-mobile/fenix/pull/16942#issuecomment-742794701)||2021-08-01 |2 |
| metrics.has_mobile_bookmarks |[boolean](https://mozilla.github.io/glean/book/user/metrics/boolean.html) |A boolean that indicates if the user has bookmarks in the mobile folder  |[mozilla-mobile/fenix#16942](https://github.com/mozilla-mobile/fenix/pull/16942), [mozilla-mobile/fenix#16942](https://github.com/mozilla-mobile/fenix/pull/16942#issuecomment-742794701)||2021-08-01 |2 |
| metrics.has_open_tabs |[boolean](https://mozilla.github.io/glean/book/user/metrics/boolean.html) |A boolean that indicates if the user has any open NORMAL tabs.  |[mozilla-mobile/fenix#12024](https://github.com/mozilla-mobile/fenix/pull/12024), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
| metrics.has_recent_pwas |[boolean](https://mozilla.github.io/glean/book/user/metrics/boolean.html) |A boolean that indicates if the user has recently used PWAs. See recently_used_pwa_count for the actual count.  |[mozilla-mobile/fenix#11982](https://github.com/mozilla-mobile/fenix/pull/11982#pullrequestreview-437963817), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
| metrics.has_top_sites |[boolean](https://mozilla.github.io/glean/book/user/metrics/boolean.html) |A boolean that indicates if the user has top sites  |[mozilla-mobile/fenix#9556](https://github.com/mozilla-mobile/fenix/pull/9556), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
| metrics.mobile_bookmarks_count |[counter](https://mozilla.github.io/glean/book/user/metrics/counter.html) |A counter that indicates how many bookmarks a user has in the mobile folder. This value will only be set if the user has at least *one* bookmark. If they have 0, this ping will not get sent, resulting in a null value. To disambiguate between a failed `mobile_bookmarks_count` ping and 0 bookmarks, please see `has_mobile_bookmarks`.  |[mozilla-mobile/fenix#16942](https://github.com/mozilla-mobile/fenix/pull/16942), [mozilla-mobile/fenix#16942](https://github.com/mozilla-mobile/fenix/pull/16942#issuecomment-742794701)||2021-08-01 |2 |
| metrics.mozilla_products |[string_list](https://mozilla.github.io/glean/book/user/metrics/string_list.html) |A list of all the Mozilla products installed on device. We currently scan for: Firefox, Firefox Beta, Firefox Aurora, Firefox Nightly, Firefox Fdroid, Firefox Lite, Reference Browser, Reference Browser Debug, Fenix, Focus, and Lockwise.  |[mozilla-mobile/fenix#1953/](https://github.com/mozilla-mobile/fenix/pull/1953/), [mozilla-mobile/fenix#5216](https://github.com/mozilla-mobile/fenix/pull/5216), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |1, 2 |
| metrics.recently_used_pwa_count |[counter](https://mozilla.github.io/glean/book/user/metrics/counter.html) |A counter that indicates how many PWAs a user has recently used. Threshold for "recency" set in HomeActivity#PWA_RECENTLY_USED_THRESHOLD. Currently we are not told by the OS when a PWA is removed by the user, so we use the "recently used" heuristic to judge how many PWAs are still active, as a proxy for "installed". This value will only be set if the user has at least *one* recently used PWA. If they have 0, this metric will not be sent, resulting in a null value during analysis on the server-side. To disambiguate between a failed `recently_used_pwa_count` metric and 0 recent PWAs, please see `has_recent_pwas`.  |[mozilla-mobile/fenix#11982](https://github.com/mozilla-mobile/fenix/pull/11982#pullrequestreview-437963817), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
| metrics.search_count |[labeled_counter](https://mozilla.github.io/glean/book/user/metrics/labeled_counters.html) |The labels for this counter are `<search-engine-name>.<source>`.  If the search engine is bundled with Fenix `search-engine-name` will be the name of the search engine. If it's a custom search engine (defined: https://github.com/mozilla-mobile/fenix/issues/1607) the value will be `custom`.  `source` will be: `action`, `suggestion`, `widget`, `shortcut`, `topsite` (depending on the source from which the search started). Also added the `other` option for the source but it should never enter on this case.  |[mozilla-mobile/fenix#1677](https://github.com/mozilla-mobile/fenix/pull/1677), [mozilla-mobile/fenix#5216](https://github.com/mozilla-mobile/fenix/pull/5216), [mozilla-mobile/fenix#7310](https://github.com/mozilla-mobile/fenix/pull/7310), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |1, 2 |
| metrics.search_widget_installed |[boolean](https://mozilla.github.io/glean/book/user/metrics/boolean.html) |Whether or not the search widget is installed  |[mozilla-mobile/fenix#10958](https://github.com/mozilla-mobile/fenix/pull/10958), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
| metrics.start_reason_activity_error |[boolean](https://mozilla.github.io/glean/book/user/metrics/boolean.html) |The `AppStartReasonProvider.ActivityLifecycleCallbacks.onActivityCreated` was unexpectedly called twice. We can use this metric to validate our assumptions about how these APIs are called. This probe can be removed once we validate these assumptions.  |[mozilla-mobile/fenix#18632](https://github.com/mozilla-mobile/fenix/pull/18632#issue-600193452)||2021-08-11 |1 |
| metrics.start_reason_process_error |[boolean](https://mozilla.github.io/glean/book/user/metrics/boolean.html) |The `AppStartReasonProvider.ProcessLifecycleObserver.onCreate` was unexpectedly called twice. We can use this metric to validate our assumptions about how these APIs are called. This probe can be removed once we validate these assumptions.  |[mozilla-mobile/fenix#18632](https://github.com/mozilla-mobile/fenix/pull/18632#issue-600193452)||2021-08-11 |1 |
| metrics.tab_view_setting |[string](https://mozilla.github.io/glean/book/user/metrics/string.html) |A string that indicates the setting for tab view: GRID, LIST  |[mozilla-mobile/fenix#15811](https://github.com/mozilla-mobile/fenix/pull/15811#issuecomment-706402952)||2021-08-01 |2 |
| metrics.tabs_open_count |[counter](https://mozilla.github.io/glean/book/user/metrics/counter.html) |A counter that indicates how many NORMAL tabs a user has open. This value will only be set if the user has at least *one* open tab. If they have 0, this ping will not get sent, resulting in a null value. To disambiguate between a failed `tabs_open_count` ping and 0 open tabs, please see `has_open_tabs`.  |[mozilla-mobile/fenix#12024](https://github.com/mozilla-mobile/fenix/pull/12024), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
| metrics.toolbar_position |[string](https://mozilla.github.io/glean/book/user/metrics/string.html) |A string that indicates the new position of the toolbar TOP or BOTTOM  |[mozilla-mobile/fenix#6608](https://github.com/mozilla-mobile/fenix/pull/6608), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
| metrics.top_sites_count |[counter](https://mozilla.github.io/glean/book/user/metrics/counter.html) |A counter that indicates how many top sites a user has. This value will only be set if the user has at least *one* top site. If they have 0, this ping will not get sent, resulting in a null value. To disambiguate between a failed `top_sites_count` ping and 0 top sites, please see `has_top_sites`.  |[mozilla-mobile/fenix#9556](https://github.com/mozilla-mobile/fenix/pull/9556), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
| perf.awesomebar.bookmark_suggestions |[timing_distribution](https://mozilla.github.io/glean/book/user/metrics/timing_distribution.html) |Duration of a bookmarks awesomebar suggestion query.  |[mozilla-mobile/fenix#10276](https://github.com/mozilla-mobile/fenix/pull/10276#pullrequestreview-411101979)||2021-11-15 |1, 2 |
| perf.awesomebar.clipboard_suggestions |[timing_distribution](https://mozilla.github.io/glean/book/user/metrics/timing_distribution.html) |Duration of a clipboard awesomebar suggestion query.  |[mozilla-mobile/fenix#10276](https://github.com/mozilla-mobile/fenix/pull/10276#pullrequestreview-411101979)||2021-11-15 |1, 2 |
| perf.awesomebar.history_suggestions |[timing_distribution](https://mozilla.github.io/glean/book/user/metrics/timing_distribution.html) |Duration of a history awesomebar suggestion query.  |[mozilla-mobile/fenix#10276](https://github.com/mozilla-mobile/fenix/pull/10276#pullrequestreview-411101979)||2021-11-15 |1, 2 |
| perf.awesomebar.search_engine_suggestions |[timing_distribution](https://mozilla.github.io/glean/book/user/metrics/timing_distribution.html) |Duration of a search engine awesomebar suggestion query.  |[mozilla-mobile/fenix#10276](https://github.com/mozilla-mobile/fenix/pull/10276#pullrequestreview-411101979)||2021-11-15 |1, 2 |
| perf.awesomebar.session_suggestions |[timing_distribution](https://mozilla.github.io/glean/book/user/metrics/timing_distribution.html) |Duration of a session awesomebar suggestion query.  |[mozilla-mobile/fenix#10276](https://github.com/mozilla-mobile/fenix/pull/10276#pullrequestreview-411101979)||2021-11-15 |1, 2 |
| perf.awesomebar.shortcuts_suggestions |[timing_distribution](https://mozilla.github.io/glean/book/user/metrics/timing_distribution.html) |Duration of a shortcuts awesomebar suggestion query.  |[mozilla-mobile/fenix#10276](https://github.com/mozilla-mobile/fenix/pull/10276#pullrequestreview-411101979)||2021-11-15 |1, 2 |
| perf.awesomebar.synced_tabs_suggestions |[timing_distribution](https://mozilla.github.io/glean/book/user/metrics/timing_distribution.html) |Duration of a synced tabs awesomebar suggestion query.  |[mozilla-mobile/fenix#10276](https://github.com/mozilla-mobile/fenix/pull/10276#pullrequestreview-411101979)||2021-11-15 |1, 2 |
| perf.startup.app_on_create_to_glean_init |[timing_distribution](https://mozilla.github.io/glean/book/user/metrics/timing_distribution.html) |A subsection of the duration of `FenixApplication.onCreate` and thus the `application_on_create` probe from the start of the method through when `initializeGlean` is called. Note: `initializeGlean` is a no-op for Beta and Release builds which instead initialize it during `MigratingFenixApplication`, which we don't currently measure.  |[mozilla-mobile/fenix#18525](https://github.com/mozilla-mobile/fenix/pull/18525#issue-594961170)||2021-08-11 |1 |
| perf.startup.app_on_create_to_megazord_init |[timing_distribution](https://mozilla.github.io/glean/book/user/metrics/timing_distribution.html) |A subsection of the duration of `FenixApplication.onCreate` and thus the `application_on_create` probe from after the `app_on_create_to_glean_init` probe until we block for the megazord to complete set up.  |[mozilla-mobile/fenix#18525](https://github.com/mozilla-mobile/fenix/pull/18525#issue-594961170)||2021-08-11 |1 |
| perf.startup.app_on_create_to_setup_in_main |[timing_distribution](https://mozilla.github.io/glean/book/user/metrics/timing_distribution.html) |A subsection of the duration of `FenixApplication.onCreate` and thus the `application_on_create` probe from after the `app_on_create_to_megazord_init` probe until the end of `setupInMainProcessOnly`, which is expected to be the end of the `onCreate` call (unless the implementation later changes).  |[mozilla-mobile/fenix#18525](https://github.com/mozilla-mobile/fenix/pull/18525#issue-594961170)||2021-08-11 |1 |
| perf.startup.application_on_create |[timing_distribution](https://mozilla.github.io/glean/book/user/metrics/timing_distribution.html) |The duration of `FenixApplication.onCreate` in the main process. This does not measure the duration of migration code (via `MigratingFenixApplication` included in the Beta and Release channels.  |[mozilla-mobile/fenix#17973](https://github.com/mozilla-mobile/fenix/pull/17973#issue-572183889)||2021-08-11 |1 |
| perf.startup.base_bfragment_on_create_view |[timing_distribution](https://mozilla.github.io/glean/book/user/metrics/timing_distribution.html) |The duration of `BaseBrowserFragment.onCreateView`.  |[mozilla-mobile/fenix#18558](https://github.com/mozilla-mobile/fenix/pull/18558#issue-596791848)||2021-08-11 |1 |
| perf.startup.base_bfragment_on_view_created |[timing_distribution](https://mozilla.github.io/glean/book/user/metrics/timing_distribution.html) |The duration of `BaseBrowserFragment.onViewCreated`.  |[mozilla-mobile/fenix#18558](https://github.com/mozilla-mobile/fenix/pull/18558#issue-596791848)||2021-08-11 |1 |
| perf.startup.cold_main_app_to_first_frame |[timing_distribution](https://mozilla.github.io/glean/book/user/metrics/timing_distribution.html) |The duration from `*Application`'s initializer to the first Android frame being drawn in a [COLD MAIN start up](https://wiki.mozilla.org/index.php?title=Performance/Fenix/Glossary). Notably, this duration omits the time from process start to the initializer (which includes a lengthy dex operation) and the time from the first frame to visual completeness. This probe doesn't measure Custom Tabs or other uses of `ExternalAppBrowserActivity` to simplify result analysis. The methodology for determining this measurement is imperfect to simplify implementation. Issues may include: <br>- Not measuring Beta and Release channels (due to `MigrationDecisionActivity` interrupting the logic). <br>- Not distinguishing between MAIN to homescreen, onboarding, session restore, others? <br>- Not choosing to record a MAIN based on what the user would see and thus the core code path (i.e. the thing we want to measure) but rather on the initial `Intent` state. <br><br> The hope is that these cases will not have a significant impact on the end results but, if they appear to, we can replace it with a more complex implementation. <br><br> Around April 8, 2021 the implementation was refactored. Functionally, it should be the same but it's noted just in case there are bugs.  |[mozilla-mobile/fenix#18632](https://github.com/mozilla-mobile/fenix/pull/18632#issue-600193452)||2021-08-11 |1 |
| perf.startup.cold_unknwn_app_to_first_frame |[timing_distribution](https://mozilla.github.io/glean/book/user/metrics/timing_distribution.html) |The duration from `*Application`'s initializer to the first Android frame being drawn in a [COLD start up](https://wiki.mozilla.org/index.php?title=Performance/Fenix/Glossary) where we can't say it was a MAIN or VIEW start up. The methodology for determining this measurement is imperfect to simplify implementation. <br><br> See the `cold_main_app_to_first_frame` probe docs for known issues and more details. <br><br> Around April 8, 2021 the implementation was refactored. Functionally, it should be the same but it's noted just in case there are bugs.  |[mozilla-mobile/fenix#18632](https://github.com/mozilla-mobile/fenix/pull/18632#issue-600193452)||2021-08-11 |1 |
| perf.startup.cold_view_app_to_first_frame |[timing_distribution](https://mozilla.github.io/glean/book/user/metrics/timing_distribution.html) |The duration from `*Application`'s initializer to the first Android frame being drawn in a [COLD VIEW start up](https://wiki.mozilla.org/index.php?title=Performance/Fenix/Glossary). The methodology for determining this measurement is imperfect to simplify implementation. Issues may include: <br>-Including VIEW intents that aren't valid so take code paths similar to MAIN (this is speculative) <br><br> See the `cold_main_app_to_first_frame` probe docs for other possible known issues and more details. <br><br> Around April 8, 2021 the implementation was refactored. Functionally, it should be the same but it's noted just in case there are bugs.  |[mozilla-mobile/fenix#18632](https://github.com/mozilla-mobile/fenix/pull/18632#issue-600193452)||2021-08-11 |1 |
| perf.startup.home_activity_on_create |[timing_distribution](https://mozilla.github.io/glean/book/user/metrics/timing_distribution.html) |The duration of `HomeActivity.onCreate`.  |[mozilla-mobile/fenix#17973](https://github.com/mozilla-mobile/fenix/pull/17973#issue-572183889)||2021-08-11 |1 |
| perf.startup.home_activity_on_start |[timing_distribution](https://mozilla.github.io/glean/book/user/metrics/timing_distribution.html) |The duration of `HomeActivity.onStart`. This may encapsulate `HomeFragment` or `BrowserFragment` creation, depending on the code path, so we expect this to take varying amounts of time. As such, this probe may not be easy to interpret directly but we believe collecting it may give us more information about different patterns we might see in performance data.  |[mozilla-mobile/fenix#18558](https://github.com/mozilla-mobile/fenix/pull/18558#issue-596791848)||2021-08-11 |1 |
| perf.startup.home_fragment_on_create_view |[timing_distribution](https://mozilla.github.io/glean/book/user/metrics/timing_distribution.html) |The duration of `HomeFragment.onCreateView`.  |[mozilla-mobile/fenix#18558](https://github.com/mozilla-mobile/fenix/pull/18558#issue-596791848)||2021-08-11 |1 |
| perf.startup.home_fragment_on_view_created |[timing_distribution](https://mozilla.github.io/glean/book/user/metrics/timing_distribution.html) |The duration of `HomeFragment.onViewCreated`.  |[mozilla-mobile/fenix#18558](https://github.com/mozilla-mobile/fenix/pull/18558#issue-596791848)||2021-08-11 |1 |
| perf.startup.startup_type |[labeled_counter](https://mozilla.github.io/glean/book/user/metrics/labeled_counters.html) |Indicates how the browser was started. The label is divided into two variables. `state` is how cached the browser is when started. `path` is what code path we are expected to take. Together, they create a combined label: `state_path`. For brevity, the specific states are documented in the [Fenix perf glossary](https://wiki.mozilla.org/index.php?title=Performance/Fenix/Glossary). <br><br> This implementation is intended to be simple, not comprehensive. We list the implications below.  <br><br> These ways of opening the app undesirably adds events to our primary buckets (non-`unknown` cases): <br>- App switcher cold/warm: `cold/warm_` + duplicates path from previous launch <br>- Home screen shortcuts: `*_view` <br>- An Intent is sent internally that's uses `ACTION_MAIN` or `ACTION_VIEW` could be: `*_main/view` (unknown if this ever happens) <br>- A command-line launch uses `ACTION_MAIN` or `ACTION_VIEW` could be: `*_main/view`  <br><br> These ways of opening the app undesirably do not add their events to our primary buckets: <br>- Close and reopen the app very quickly: no event is recorded.  <br><br> These ways of opening the app don't affect our primary buckets: <br>- App switcher hot: `hot_unknown` <br>- PWA (all states): `unknown_unknown` <br>- Custom tab: `unknown_view` <br>- Cold start where a service or other non-activity starts the process (not manually tested) - this seems to happen if you have the homescreen widget: `unknown_*` <br>- Another activity is drawn before HomeActivity (e.g. widget voice search): `unknown_*` <br>- Widget text search: `*_unknown`  <br><br> In addition to the events above, the `unknown` state may be chosen when we were unable to determine a cause due to implementation details or the API was used incorrectly. We may be able to record the events listed above into different buckets but we kept the implementation simple for now. <br><br> N.B.: for implementation simplicity, we duplicate the logic in app that determines `path` so it's not perfectly accurate. In one way, we record we is intended to happen rather than what actually happened (e.g. the user may click a link so we record VIEW but the app does a MAIN by going to the homescreen because the link was invalid).  |[mozilla-mobile/fenix#19028](https://github.com/mozilla-mobile/fenix/pull/19028)|<ul><li>cold_main</li><li>cold_view</li><li>cold_unknown</li><li>warm_main</li><li>warm_view</li><li>warm_unknown</li><li>hot_main</li><li>hot_view</li><li>hot_unknown</li><li>unknown_main</li><li>unknown_view</li><li>unknown_unknown</li></ul>|2021-10-09 |2 |
| preferences.accessibility_services |[string_list](https://mozilla.github.io/glean/book/user/metrics/string_list.html) |Whether or not the user has touch exploration or switch services enabled. These are built into the Android OS, not Fenix prefs. default: ""  |[mozilla-mobile/fenix#11211](https://github.com/mozilla-mobile/fenix/pull/11211), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
| preferences.open_links_in_a_private_tab |[string_list](https://mozilla.github.io/glean/book/user/metrics/string_list.html) |Whether or not the user has enabled open links in a private tab. default: false  |[mozilla-mobile/fenix#11211](https://github.com/mozilla-mobile/fenix/pull/11211), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
| preferences.open_links_in_app |[string_list](https://mozilla.github.io/glean/book/user/metrics/string_list.html) |Whether or not the user has the open links in apps feature enabled. default: false  |[mozilla-mobile/fenix#11446](https://github.com/mozilla-mobile/fenix/pull/11446), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
| preferences.remote_debugging |[string_list](https://mozilla.github.io/glean/book/user/metrics/string_list.html) |Whether or not the user has remote debugging enabled default: false  |[mozilla-mobile/fenix#11211](https://github.com/mozilla-mobile/fenix/pull/11211), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
| preferences.search_bookmarks |[string_list](https://mozilla.github.io/glean/book/user/metrics/string_list.html) |Whether or not the user has enabled bookmark search suggestions default: true  |[mozilla-mobile/fenix#11211](https://github.com/mozilla-mobile/fenix/pull/11211), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
| preferences.search_browsing_history |[string_list](https://mozilla.github.io/glean/book/user/metrics/string_list.html) |Whether or not the user has enabled browsing history suggestions. default: true  |[mozilla-mobile/fenix#11211](https://github.com/mozilla-mobile/fenix/pull/11211), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
| preferences.search_suggestions_private |[string_list](https://mozilla.github.io/glean/book/user/metrics/string_list.html) |Whether or not the user has enabled showing search suggestions in private mode. default: false (we prompt the user, asking them to make a selection)  |[mozilla-mobile/fenix#11211](https://github.com/mozilla-mobile/fenix/pull/11211), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
| preferences.show_clipboard_suggestions |[string_list](https://mozilla.github.io/glean/book/user/metrics/string_list.html) |Whether or not the user has enabled clipboard search suggestions. default: true  |[mozilla-mobile/fenix#11211](https://github.com/mozilla-mobile/fenix/pull/11211), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
| preferences.show_search_shortcuts |[string_list](https://mozilla.github.io/glean/book/user/metrics/string_list.html) |Whether or not the user has enabled search shortcuts. default: true  |[mozilla-mobile/fenix#11211](https://github.com/mozilla-mobile/fenix/pull/11211), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
| preferences.show_search_suggestions |[string_list](https://mozilla.github.io/glean/book/user/metrics/string_list.html) |Whether or not the user has search suggestions enabled default: true  |[mozilla-mobile/fenix#11211](https://github.com/mozilla-mobile/fenix/pull/11211), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
| preferences.show_voice_search |[string_list](https://mozilla.github.io/glean/book/user/metrics/string_list.html) |Whether or not the user has enabled the voice search button. default: true  |[mozilla-mobile/fenix#11211](https://github.com/mozilla-mobile/fenix/pull/11211), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
| preferences.sync |[string_list](https://mozilla.github.io/glean/book/user/metrics/string_list.html) |Whether or not the user is signed into FxA default: false  |[mozilla-mobile/fenix#11211](https://github.com/mozilla-mobile/fenix/pull/11211), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
| preferences.sync_items |[string_list](https://mozilla.github.io/glean/book/user/metrics/string_list.html) |The list of items the user has chosen to sync with FxA. default: "" if the user is signed out. Otherwise defaults to whatever is set in their FxA account. New accounts set: [bookmarks, history, passwords, tabs]  |[mozilla-mobile/fenix#11211](https://github.com/mozilla-mobile/fenix/pull/11211), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
| preferences.telemetry |[string_list](https://mozilla.github.io/glean/book/user/metrics/string_list.html) |Whether or not the user has telemetry enabled. Note we should never receive a "false" value for this since telemetry would not send in that case. default: true  |[mozilla-mobile/fenix#11211](https://github.com/mozilla-mobile/fenix/pull/11211), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
| preferences.theme |[string_list](https://mozilla.github.io/glean/book/user/metrics/string_list.html) |The theme the user has enabled. "light," "dark," "system," or "battery" default: "system" for API 28+, else "light"  |[mozilla-mobile/fenix#11446](https://github.com/mozilla-mobile/fenix/pull/11446), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
| preferences.toolbar_position |[string_list](https://mozilla.github.io/glean/book/user/metrics/string_list.html) |The position of the toolbar default: bottom (defaults to top if the user has accessibility services)  |[mozilla-mobile/fenix#11211](https://github.com/mozilla-mobile/fenix/pull/11211), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
| preferences.tracking_protection |[string_list](https://mozilla.github.io/glean/book/user/metrics/string_list.html) |What type of enhanced tracking protection the user has enabled. "standard," "strict," "custom," or "" (if disabled) default: "standard"  |[mozilla-mobile/fenix#11211](https://github.com/mozilla-mobile/fenix/pull/11211), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
| search.default_engine.code |[string](https://mozilla.github.io/glean/book/user/metrics/string.html) |If the search engine is pre-loaded with Fenix this value will be the search engine identifier. If it's a custom search engine (defined: https://github.com/mozilla-mobile/fenix/issues/1607) the value will be "custom"  |[mozilla-mobile/fenix#1606](https://github.com/mozilla-mobile/fenix/pull/1606), [mozilla-mobile/fenix#5216](https://github.com/mozilla-mobile/fenix/pull/5216), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |1, 2 |
| search.default_engine.name |[string](https://mozilla.github.io/glean/book/user/metrics/string.html) |If the search engine is pre-loaded with Fenix this value will be the search engine name. If it's a custom search engine (defined: https://github.com/mozilla-mobile/fenix/issues/1607) the value will be "custom"  |[mozilla-mobile/fenix#1606](https://github.com/mozilla-mobile/fenix/pull/1606), [mozilla-mobile/fenix#5216](https://github.com/mozilla-mobile/fenix/pull/5216), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |1, 2 |
| search.default_engine.submission_url |[string](https://mozilla.github.io/glean/book/user/metrics/string.html) |If the search engine is pre-loaded with Fenix this value will be he base URL we use to build the search query for the search engine. For example: https://mysearchengine.com/?query=%s. If it's a custom search engine (defined: https://github.com/mozilla-mobile/fenix/issues/1607) the value will be "custom"  |[mozilla-mobile/fenix#1606](https://github.com/mozilla-mobile/fenix/pull/1606), [mozilla-mobile/fenix#5216](https://github.com/mozilla-mobile/fenix/pull/5216), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |1, 2 |
| storage.stats.app_bytes |[memory_distribution](https://mozilla.github.io/glean/book/user/metrics/memory_distribution.html) |The size of the app's APK and related files as installed: this is expected to be larger than download size. This is the output of [StorageStats.getAppBytes](https://developer.android.com/reference/android/app/usage/StorageStats#getAppBytes()) so see that for details. This value is only available on Android 8+. A similar value may be available on the Google Play dashboard: we can use this value to see if that value is reliable enough.  |[mozilla-mobile/fenix#12876](https://github.com/mozilla-mobile/fenix/pull/12876#issuecomment-666770732), [mozilla-mobile/fenix#17704](https://github.com/mozilla-mobile/fenix/pull/17704#issue-564299127)||2021-08-01 |1, 2 |
| storage.stats.cache_bytes |[memory_distribution](https://mozilla.github.io/glean/book/user/metrics/memory_distribution.html) |The size of all cached data in the app. This is the output of [StorageStats.getCacheBytes](https://developer.android.com/reference/android/app/usage/StorageStats#getCacheBytes()) so see that for details. This value is only available on Android 8+.  |[mozilla-mobile/fenix#12876](https://github.com/mozilla-mobile/fenix/pull/12876#issuecomment-666770732), [mozilla-mobile/fenix#17704](https://github.com/mozilla-mobile/fenix/pull/17704#issue-564299127)||2021-08-01 |1, 2 |
| storage.stats.data_dir_bytes |[memory_distribution](https://mozilla.github.io/glean/book/user/metrics/memory_distribution.html) |The size of all data minus `cache_bytes`. This is the output of [StorageStats.getDataBytes](https://developer.android.com/reference/android/app/usage/StorageStats#getDataBytes()) except we subtract the value of `cache_bytes` so the cache is not measured redundantly; see that method for details. This value is only available on Android 8+.  |[mozilla-mobile/fenix#12876](https://github.com/mozilla-mobile/fenix/pull/12876#issuecomment-666770732), [mozilla-mobile/fenix#17704](https://github.com/mozilla-mobile/fenix/pull/17704#issue-564299127)||2021-08-01 |1, 2 |
| storage.stats.query_stats_duration |[timing_distribution](https://mozilla.github.io/glean/book/user/metrics/timing_distribution.html) |How long it took to query the device for the StorageStats that contain the file size information. The docs say it may be expensive so we want to ensure it's not too expensive.  This value is only available on Android 8+.  |[mozilla-mobile/fenix#12876](https://github.com/mozilla-mobile/fenix/pull/12876#issuecomment-666770732), [mozilla-mobile/fenix#17704](https://github.com/mozilla-mobile/fenix/pull/17704#issue-564299127)||2021-08-01 |1, 2 |

## startup-timeline

This ping is intended to provide an understanding of startup performance.

In addition to being captured on real devices, the ping data was prematurely
optimized into this separate ping to be isolated from other metrics to be
more easily captured by performance testing automation but that hasn't
happened in practice. We would have removed it but implementation
details don't make that possible:
https://github.com/mozilla-mobile/fenix/issues/17972#issuecomment-781002987


This ping includes the [client id](https://mozilla.github.io/glean/book/user/pings/index.html#the-client_info-section).

**Data reviews for this ping:**

- <https://github.com/mozilla-mobile/fenix/pull/9788#pullrequestreview-394228626>
- <https://github.com/mozilla-mobile/fenix/pull/18043#issue-575389284>

**Bugs related to this ping:**

- <https://github.com/mozilla-mobile/fenix/issues/8803>
- <https://github.com/mozilla-mobile/fenix/issues/17972>

All Glean pings contain built-in metrics in the [`ping_info`](https://mozilla.github.io/glean/book/user/pings/index.html#the-ping_info-section) and [`client_info`](https://mozilla.github.io/glean/book/user/pings/index.html#the-client_info-section) sections.

In addition to those built-in metrics, the following metrics are added to the ping:

| Name | Type | Description | Data reviews | Extras | Expiration | [Data Sensitivity](https://wiki.mozilla.org/Firefox/Data_Collection) |
| --- | --- | --- | --- | --- | --- | --- |
| startup.timeline.clock_ticks_per_second_v2 |[quantity](https://mozilla.github.io/glean/book/user/metrics/quantity.html) |The number of clock tick time units that occur in one second on this particular device. This value is expected to be used in conjunction with the `framework_primary/secondary` metrics.  |[mozilla-mobile/fenix#9788](https://github.com/mozilla-mobile/fenix/pull/9788#pullrequestreview-394228626), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068), [mozilla-mobile/fenix#18158](https://github.com/mozilla-mobile/fenix/pull/18158#issue-579593943)|<ul><li>unit: clock ticks per second</li></ul>|2021-08-01 |1 |
| startup.timeline.framework_primary |[timespan](https://mozilla.github.io/glean/book/user/metrics/timespan.html) |The duration the Android framework takes to start before letting us run code in `*Application.init` when this device has `clock_ticks_per_second_v2` equal to 100: if it's not equal to 100, then this value is captured in `framework_secondary`. We split this into two metrics to make it easier to analyze in GLAM. We split on 100 because when we did our initial brief analysis - https://sql.telemetry.mozilla.org/queries/75591 - the results for clocks ticks were overwhelmingly 100.  The duration is calculated from `appInitTimestamp - processStartTimestamp`. `processStartTimestamp` is derived from the clock tick time unit, which is expected to be less granular than nanoseconds. Therefore, we convert and round our timestamps to clock ticks before computing the difference and convert back to nanoseconds to report.  For debugging purposes, `clock_ticks_per_second_v2`, which may vary between devices, is also reported as a metric  |[mozilla-mobile/fenix#9788](https://github.com/mozilla-mobile/fenix/pull/9788#pullrequestreview-394228626), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068), [mozilla-mobile/fenix#18043](https://github.com/mozilla-mobile/fenix/pull/18043#issue-575389284)||2021-08-01 |1 |
| startup.timeline.framework_secondary |[timespan](https://mozilla.github.io/glean/book/user/metrics/timespan.html) |The duration the Android framework takes to start before letting us run code in `*Application.init` when this device has `clock_ticks_per_second_v2` not equal to 100. For more details on this metric, see `framework_primary`  |[mozilla-mobile/fenix#18043](https://github.com/mozilla-mobile/fenix/pull/18043#issue-575389284)||2021-08-01 |1 |
| startup.timeline.framework_start_error |[boolean](https://mozilla.github.io/glean/book/user/metrics/boolean.html) |An error when attempting to record `framework_primary/secondary` - the application init timestamp returned a negative value - which is likely indicative of a bug in the implementation.  |[mozilla-mobile/fenix#9788](https://github.com/mozilla-mobile/fenix/pull/9788#pullrequestreview-394228626), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |1 |
| startup.timeline.framework_start_read_error |[boolean](https://mozilla.github.io/glean/book/user/metrics/boolean.html) |An error when attempting to read stats from /proc pseudo-filesystem - privacy managers can block access to reading these files - the application will catch a file reading exception.  |[mozilla-mobile/fenix#10481](https://github.com/mozilla-mobile/fenix/pull/10481), [mozilla-mobile/fenix#15713](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |1 |

Data categories are [defined here](https://wiki.mozilla.org/Firefox/Data_Collection).

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