@ -312,6 +312,7 @@ In addition to those built-in metrics, the following metrics are added to the pi
| 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 |
| 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.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 |
| 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.activity_state_provider_error |[boolean](https://mozilla.github.io/glean/book/user/metrics/boolean.html) |The `StartupActivityStateProvider...onActivityStarted` 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. |[Review 1](TODO)||2021-08-11 |1 |
| 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_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_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_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 |
@ -331,7 +332,7 @@ In addition to those built-in metrics, the following metrics are added to the pi
| 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.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_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.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.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. |[Review 1](TODO)||2021-08-11 |1 |
| 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. |[Review 1](TODO)||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. |[Review 1](TODO)||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. |[Review 1](TODO)||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.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.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 |