For #8125 - Send top sites count with metrics ping

app/metrics.yaml

@@ -295,6 +295,34 @@ metrics:
     notification_emails:
     - fenix-core@mozilla.com
     expires: "2020-09-01"
+  top_sites_count:
+    type: counter
+    lifetime: application
+    description: >
+      A counter that indicates how many top sites a user has
+    send_in_pings:
+      - metrics
+    bugs:
+      - https://github.com/mozilla-mobile/fenix/issues/8125
+    data_reviews:
+      - https://github.com/mozilla-mobile/fenix/pull/9556
+    notification_emails:
+      - fenix-core@mozilla.com
+    expires: "2020-09-01"
+  has_top_sites:
+    type: boolean
+    lifetime: application
+    description: >
+      A boolean that indicates if the user has top sites
+    send_in_pings:
+      - metrics
+    bugs:
+      - https://github.com/mozilla-mobile/fenix/issues/8125
+    data_reviews:
+      - https://github.com/mozilla-mobile/fenix/pull/9556
+    notification_emails:
+      - fenix-core@mozilla.com
+    expires: "2020-09-01"
   search_count:
     type: labeled_counter
     description: >

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

@@ -546,6 +546,8 @@ class GleanMetricsService(private val context: Context) : MetricsService {
             adjustAdGroup.set(context.settings().adjustAdGroup)
             adjustCreative.set(context.settings().adjustCreative)
             adjustNetwork.set(context.settings().adjustNetwork)
+            hasTopSites.set(context.settings().topSitesSize > 0)
+            topSitesCount.add(context.settings().topSitesSize)
 
             toolbarPosition.set(
                 if (context.settings().shouldUseBottomToolbar) {

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

@@ -42,19 +42,8 @@ import androidx.recyclerview.widget.RecyclerView
 import androidx.recyclerview.widget.RecyclerView.SCROLL_STATE_IDLE
 import com.google.android.material.appbar.AppBarLayout
 import com.google.android.material.snackbar.Snackbar
-import kotlinx.android.synthetic.main.fragment_home.homeAppBar
-import kotlinx.android.synthetic.main.fragment_home.privateBrowsingButton
-import kotlinx.android.synthetic.main.fragment_home.search_engine_icon
-import kotlinx.android.synthetic.main.fragment_home.toolbarLayout
-import kotlinx.android.synthetic.main.fragment_home.view.add_tab_button
-import kotlinx.android.synthetic.main.fragment_home.view.bottomBarShadow
-import kotlinx.android.synthetic.main.fragment_home.view.bottom_bar
-import kotlinx.android.synthetic.main.fragment_home.view.homeAppBar
-import kotlinx.android.synthetic.main.fragment_home.view.menuButton
-import kotlinx.android.synthetic.main.fragment_home.view.sessionControlRecyclerView
-import kotlinx.android.synthetic.main.fragment_home.view.toolbar
-import kotlinx.android.synthetic.main.fragment_home.view.toolbarLayout
-import kotlinx.android.synthetic.main.fragment_home.view.toolbar_wrapper
+import kotlinx.android.synthetic.main.fragment_home.*
+import kotlinx.android.synthetic.main.fragment_home.view.*
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Dispatchers.IO
 import kotlinx.coroutines.Dispatchers.Main
@@ -689,6 +678,8 @@ class HomeFragment : Fragment() {
     private fun subscribeToTopSites(): Observer<List<TopSite>> {
         return Observer<List<TopSite>> { topSites ->
             requireComponents.core.topSiteStorage.cachedTopSites = topSites
+            context?.settings()?.preferences?.edit()
+                ?.putInt(getString(R.string.pref_key_top_sites_size), topSites.size)?.apply()
             homeFragmentStore.dispatch(HomeFragmentAction.TopSitesChange(topSites))
         }.also { observer ->
             requireComponents.core.topSiteStorage.getTopSites().observe(this, observer)

app/src/main/java/org/mozilla/fenix/utils/Settings.kt

@@ -609,4 +609,9 @@ class Settings private constructor(
         appContext.getPreferenceKey(R.string.pref_key_override_sync_tokenserver),
         default = ""
     )
+
+    val topSitesSize by intPreference(
+        appContext.getPreferenceKey(R.string.pref_key_top_sites_size),
+        default = 0
+    )
 }

app/src/main/res/values/preference_keys.xml

@@ -156,4 +156,5 @@
 
     <string name="pref_key_encryption_key_generated" translatable="false">pref_key_encryption_key_generated</string>
     <string name="default_top_sites_added" translatable="false">pref_key_pocket_top_site_added</string>
+    <string name="pref_key_top_sites_size" translatable="false">pref_key_top_sites_size</string>
 </resources>