MR2 Telemetry: Homescreen view count (#22377)

* For #22146 - Added counter for home screen views

* For #22146 - Added PR number to metrics

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

app/metrics.yaml

@@ -5639,6 +5639,19 @@ home_screen:
     notification_emails:
       - android-probes@mozilla.com
     expires: "2022-04-01"
+  home_screen_view_count:
+    type: counter
+    description: |
+      The number of times the home screen was displayed to the user.
+    bugs:
+      - https://github.com/mozilla-mobile/fenix/issues/22146
+    data_reviews:
+      - https://github.com/mozilla-mobile/fenix/pull/22377
+    data_sensitivity:
+      - interaction
+    notification_emails:
+      - android-probes@mozilla.com
+    expires: "2022-11-01"
   customize_home_clicked:
     type: event
     description: A user clicked on Customize home from the home screen menu.

app/src/main/java/org/mozilla/fenix/HomeActivity.kt

@@ -230,7 +230,7 @@ open class HomeActivity : LocaleAwareAppCompatActivity(), NavHostActivity {
         }
 
         if (!shouldStartOnHome() &&
-            shouldNavigateBrowserFragmentOnCouldStart(savedInstanceState)
+            shouldNavigateBrowserFragmentOnColdStart(savedInstanceState)
         ) {
             navigateToBrowserOnColdStart()
         } else if (FeatureFlags.showStartOnHomeSettings) {
@@ -1001,7 +1001,7 @@ open class HomeActivity : LocaleAwareAppCompatActivity(), NavHostActivity {
     @VisibleForTesting
     internal fun getSettings(): Settings = settings()
 
-    private fun shouldNavigateBrowserFragmentOnCouldStart(savedInstanceState: Bundle?): Boolean {
+    private fun shouldNavigateBrowserFragmentOnColdStart(savedInstanceState: Bundle?): Boolean {
         return isActivityColdStarted(intent, savedInstanceState) &&
             !externalSourceIntentProcessors.any {
                 it.process(

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

@@ -262,6 +262,7 @@ sealed class Event {
     // Home menu interaction
     object HomeMenuSettingsItemClicked : Event()
     object HomeScreenDisplayed : Event()
+    object HomeScreenViewCount : Event()
     object HomeScreenCustomizedHomeClicked : Event()
 
     // Browser Toolbar

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

@@ -779,6 +779,9 @@ private val Event.wrapper: EventWrapper<*>?
         is Event.HomeScreenDisplayed -> EventWrapper<NoExtraKeys>(
             { HomeScreen.homeScreenDisplayed.record(it) }
         )
+        is Event.HomeScreenViewCount -> EventWrapper<NoExtraKeys>(
+            { HomeScreen.homeScreenViewCount.add() }
+        )
         is Event.HomeScreenCustomizedHomeClicked -> EventWrapper<NoExtraKeys>(
             { HomeScreen.customizeHomeClicked.record(it) }
         )

app/src/main/java/org/mozilla/fenix/home/HomeFragment.kt

@@ -480,7 +480,10 @@ class HomeFragment : Fragment() {
         val profilerStartTime = requireComponents.core.engine.profiler?.getProfilerTime()
 
         super.onViewCreated(view, savedInstanceState)
-        context?.metrics?.track(Event.HomeScreenDisplayed)
+        context?.metrics?.apply {
+            track(Event.HomeScreenDisplayed)
+            track(Event.HomeScreenViewCount)
+        }
 
         observeSearchEngineChanges()
         createHomeMenu(requireContext(), WeakReference(binding.menuButton))