Bug 1841156 - New event telemetry for Firefox Sync.

app/metrics.yaml

@@ -10093,3 +10093,19 @@ app_icon:
     metadata:
       tags:
         - Tabs
+
+sync:
+  failed:
+    type: event
+    description: |
+      User sign-in/sync has failed.
+    bugs:
+      - https://bugzilla.mozilla.org/show_bug.cgi?id=1841156
+    data_reviews:
+      - https://github.com/mozilla-mobile/firefox-android/pull/2726
+    data_sensitivity:
+      - interaction
+    notification_emails:
+      - android-probes@mozilla.com
+      - cgordon@mozilla.com
+    expires: never

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

@@ -26,6 +26,7 @@ import mozilla.components.feature.search.telemetry.incontent.InContentTelemetry
 import mozilla.components.feature.sitepermissions.SitePermissionsFacts
 import mozilla.components.feature.syncedtabs.facts.SyncedTabsFacts
 import mozilla.components.feature.top.sites.facts.TopSitesFacts
+import mozilla.components.service.fxa.SyncFacts
 import mozilla.components.support.base.Component
 import mozilla.components.support.base.facts.Action
 import mozilla.components.support.base.facts.Fact
@@ -50,6 +51,7 @@ import org.mozilla.fenix.GleanMetrics.MediaState
 import org.mozilla.fenix.GleanMetrics.PerfAwesomebar
 import org.mozilla.fenix.GleanMetrics.ProgressiveWebApp
 import org.mozilla.fenix.GleanMetrics.SitePermissions
+import org.mozilla.fenix.GleanMetrics.Sync
 import org.mozilla.fenix.GleanMetrics.SyncedTabs
 import org.mozilla.fenix.search.awesomebar.ShortcutsSuggestionProvider
 import org.mozilla.fenix.utils.Settings
@@ -352,6 +354,9 @@ internal class ReleaseMetricController(
                 }
             }
         }
+        Component.SERVICE_FIREFOX_ACCOUNTS to SyncFacts.Items.SYNC_FAILED -> {
+            Sync.failed.record(NoExtras())
+        }
 
         else -> {
             // no-op