Recent bookmark count telemetry (#22293)

* For #22075 - Added event to track the count of recent bookmarks

* For #22075 - Added data review issue number

Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>

app/metrics.yaml

@@ -5893,6 +5893,21 @@ recent_bookmarks:
     notification_emails:
       - android-probes@mozilla.com
     expires: "2022-02-01"
+  recent_bookmarks_count:
+    type: quantity
+    description: |
+      The number of bookmarked items appearing in the
+      Recently Saved section on the home page.
+    bugs:
+      - https://github.com/mozilla-mobile/fenix/issues/22075
+    data_reviews:
+      - https://github.com/mozilla-mobile/fenix/pull/22293
+    data_sensitivity:
+      - interaction
+    notification_emails:
+      - android-probes@mozilla.com
+    expires: "2022-11-01"
+    unit: integer
 
 recent_searches:
   group_deleted:

app/src/main/java/org/mozilla/fenix/components/metrics/Event.kt

@@ -275,6 +275,7 @@ sealed class Event {
     object BookmarkClicked : Event()
     object ShowAllBookmarks : Event()
     object RecentBookmarksShown : Event()
+    data class RecentBookmarkCount(val count: Int) : Event()
 
     // Recently visited/Recent searches
     object RecentSearchesGroupDeleted : Event()

app/src/main/java/org/mozilla/fenix/components/metrics/GleanMetricsService.kt

@@ -823,6 +823,10 @@ private val Event.wrapper: EventWrapper<*>?
             { RecentBookmarks.shown.record(it) }
         )
 
+        is Event.RecentBookmarkCount -> EventWrapper<NoExtraKeys>(
+            { RecentBookmarks.recentBookmarksCount.set(this.count.toLong()) },
+        )
+
         is Event.AndroidAutofillRequestWithLogins -> EventWrapper<NoExtraKeys>(
             { AndroidAutofill.requestMatchingLogins.record(it) }
         )

app/src/main/java/org/mozilla/fenix/home/sessioncontrol/SessionControlController.kt

@@ -604,9 +604,13 @@ class DefaultSessionControlController(
     }
 
     override fun handleReportSessionMetrics(state: HomeFragmentState) {
-        metrics.track(
-            if (state.recentTabs.isEmpty()) Event.RecentTabsSectionIsNotVisible
-            else Event.RecentTabsSectionIsVisible
-        )
+        with(metrics) {
+            track(
+                if (state.recentTabs.isEmpty()) Event.RecentTabsSectionIsNotVisible
+                else Event.RecentTabsSectionIsVisible
+            )
+
+            track(Event.RecentBookmarkCount(state.recentBookmarks.size))
+        }
     }
 }

app/src/test/java/org/mozilla/fenix/home/DefaultSessionControlControllerTest.kt

@@ -29,6 +29,7 @@ import mozilla.components.browser.state.state.recover.RecoverableTab
 import mozilla.components.browser.state.state.selectedOrDefaultSearchEngine
 import mozilla.components.browser.state.store.BrowserStore
 import mozilla.components.concept.engine.Engine
+import mozilla.components.concept.storage.BookmarkNode
 import mozilla.components.feature.session.SessionUseCases
 import mozilla.components.feature.tab.collections.TabCollection
 import mozilla.components.feature.tabs.TabsUseCases
@@ -843,6 +844,27 @@ class DefaultSessionControlControllerTest {
         }
     }
 
+    @Test
+    fun `WHEN handleReportSessionMetrics is called AND there are zero recent bookmarks THEN report Event#RecentBookmarkCount(0)`() {
+        every { homeFragmentState.recentBookmarks } returns emptyList()
+        every { homeFragmentState.recentTabs } returns emptyList()
+        createController().handleReportSessionMetrics(homeFragmentState)
+        verify {
+            metrics.track(Event.RecentBookmarkCount(0))
+        }
+    }
+
+    @Test
+    fun `WHEN handleReportSessionMetrics is called AND there is at least one recent bookmark THEN report Event#RecentBookmarkCount(1)`() {
+        val recentBookmark: BookmarkNode = mockk(relaxed = true)
+        every { homeFragmentState.recentBookmarks } returns listOf(recentBookmark)
+        every { homeFragmentState.recentTabs } returns emptyList()
+        createController().handleReportSessionMetrics(homeFragmentState)
+        verify {
+            metrics.track(Event.RecentBookmarkCount(1))
+        }
+    }
+
     private fun createController(
         hideOnboarding: () -> Unit = { },
         registerCollectionStorageObserver: () -> Unit = { },