Bug 1823682 - add Server Knobs validation metric

app/metrics.yaml

@@ -9429,6 +9429,23 @@ private_browsing_shortcut_cfr:
       - android-probes@mozilla.com
     expires: 122
 
+server_knobs:
+  validation:
+    disabled: true
+    type: event
+    description: |
+      Temporary metric recorded at the same time as
+      "tabs_tray.new_tab_tapped" to validate that the Glean Server Knobs
+      functionality is working correctly.
+    bugs:
+      - https://bugzilla.mozilla.org/show_bug.cgi?id=1823682
+    data_reviews:
+      - https://bugzilla.mozilla.org/show_bug.cgi?id=1823682#c2
+    notification_emails:
+      - android-probes@mozilla.com
+      - brosa@mozilla.com
+    expires: 116
+
 pull_to_refresh_in_browser:
   enabled:
     type: boolean

app/src/main/java/org/mozilla/fenix/tabstray/TabsTrayController.kt

@@ -28,6 +28,7 @@ import mozilla.telemetry.glean.private.NoExtras
 import org.mozilla.fenix.BrowserDirection
 import org.mozilla.fenix.GleanMetrics.Collections
 import org.mozilla.fenix.GleanMetrics.Events
+import org.mozilla.fenix.GleanMetrics.ServerKnobs
 import org.mozilla.fenix.GleanMetrics.TabsTray
 import org.mozilla.fenix.HomeActivity
 import org.mozilla.fenix.R
@@ -478,6 +479,9 @@ class DefaultTabsTrayController(
             TabsTray.newPrivateTabTapped.record(NoExtras())
         } else {
             TabsTray.newTabTapped.record(NoExtras())
+
+            // Temporary recording for validating the Glean Server Knobs functionality.
+            ServerKnobs.validation.record(NoExtras())
         }
     }