diff --git a/app/src/main/java/org/mozilla/fenix/components/metrics/LeanplumMetricsService.kt b/app/src/main/java/org/mozilla/fenix/components/metrics/LeanplumMetricsService.kt
index 15b59c1c8..4d9ca393e 100644
--- a/app/src/main/java/org/mozilla/fenix/components/metrics/LeanplumMetricsService.kt
+++ b/app/src/main/java/org/mozilla/fenix/components/metrics/LeanplumMetricsService.kt
@@ -37,7 +37,8 @@ private val Event.name: String?
         is Event.CollectionSaved -> "E_Collection_Created"
         is Event.CollectionTabRestored -> "E_Collection_Tab_Opened"
         is Event.SyncAuthSignUp -> "E_FxA_New_Signup"
-        is Event.SyncAuthSignIn -> "E_Sign_In_FxA"
+        is Event.SyncAuthSignIn, Event.SyncAuthPaired, Event.SyncAuthOtherExternal -> "E_Sign_In_FxA"
+        is Event.SyncAuthFromShared -> "E_Sign_In_FxA_Fennec_to_Fenix"
         is Event.SyncAuthSignOut -> "E_Sign_Out_FxA"
         is Event.ClearedPrivateData -> "E_Cleared_Private_Data"
         is Event.DismissedOnboarding -> "E_Dismissed_Onboarding"
@@ -107,13 +108,13 @@ class LeanplumMetricsService(
             val currentLocale = applicationSetLocale ?: Locale.getDefault()
             val languageCode =
                 currentLocale.iso3LanguageOrNull
-                ?: currentLocale.language.let {
-                    if (it.isNotBlank()) {
-                        it
-                    } else {
-                        currentLocale.toString()
+                    ?: currentLocale.language.let {
+                        if (it.isNotBlank()) {
+                            it
+                        } else {
+                            currentLocale.toString()
+                        }
                     }
-                }
 
             if (!isLeanplumEnabled(languageCode)) {
                 Log.i(LOGTAG, "Leanplum is not available for this locale: $languageCode")
@@ -142,18 +143,21 @@ class LeanplumMetricsService(
                 }
             }
 
-            Leanplum.start(application, hashMapOf(
-                "default_browser" to MozillaProductDetector.getMozillaBrowserDefault(application).orEmpty(),
-                "fennec_installed" to installedApps.contains(MozillaProducts.FIREFOX.productName),
-                "focus_installed" to installedApps.contains(MozillaProducts.FOCUS.productName),
-                "klar_installed" to installedApps.contains(MozillaProducts.KLAR.productName),
-                "fxa_signed_in" to application.settings().fxaSignedIn,
-                "fxa_has_synced_items" to application.settings().fxaHasSyncedItems,
-                "search_widget_installed" to application.settings().searchWidgetInstalled,
-                "tracking_protection_enabled" to application.settings().shouldUseTrackingProtection,
-                "tracking_protection_setting" to trackingProtection,
-                "fenix" to true
-            ))
+            Leanplum.start(
+                application, hashMapOf(
+                    "default_browser" to MozillaProductDetector.getMozillaBrowserDefault(application)
+                        .orEmpty(),
+                    "fennec_installed" to installedApps.contains(MozillaProducts.FIREFOX.productName),
+                    "focus_installed" to installedApps.contains(MozillaProducts.FOCUS.productName),
+                    "klar_installed" to installedApps.contains(MozillaProducts.KLAR.productName),
+                    "fxa_signed_in" to application.settings().fxaSignedIn,
+                    "fxa_has_synced_items" to application.settings().fxaHasSyncedItems,
+                    "search_widget_installed" to application.settings().searchWidgetInstalled,
+                    "tracking_protection_enabled" to application.settings().shouldUseTrackingProtection,
+                    "tracking_protection_setting" to trackingProtection,
+                    "fenix" to true
+                )
+            )
 
             withContext(Main) {
                 LeanplumInternal.setCalledStart(true)
@@ -202,7 +206,9 @@ class LeanplumMetricsService(
         get() =
             try {
                 this.isO3Language
-            } catch (_: MissingResourceException) { null }
+            } catch (_: MissingResourceException) {
+                null
+            }
 
     companion object {
         private const val LOGTAG = "LeanplumMetricsService"
@@ -213,6 +219,7 @@ class LeanplumMetricsService(
         private val LeanplumToken: String
             // Debug builds have a null (nullable) LEANPLUM_TOKEN
             get() = BuildConfig.LEANPLUM_TOKEN.orEmpty()
+
         // Leanplum needs to be enabled for the following locales.
         // Irrespective of the actual device location.
         private val LEANPLUM_ENABLED_LOCALES = setOf(
diff --git a/docs/mma.md b/docs/mma.md
index de12f9208..4db6157ae 100644
--- a/docs/mma.md
+++ b/docs/mma.md
@@ -225,7 +225,12 @@ Here is the list of current Events sent, which can be found here in the code bas
     <td>`E_Sign_In_FxA`</td>
     <td>The user successfully signed in to FxA</td>
     <td><a href="https://github.com/mozilla-mobile/fenix/pull/4626#issuecomment-519691332">#4626</a></td>
-  </tr> 
+  </tr>
+  <tr>
+    <td>`E_Sign_In_FxA_Fennec_to_Fenix`</td>
+    <td>The user successfully signed in to FxA using previously signed in Fennec account</td>
+    <td><a href="https://github.com/mozilla-mobile/fenix/pull/4626#issuecomment-519691332">#4626</a></td>
+  </tr>
   <tr>
     <td>`E_Sign_Out_FxA`</td>
     <td>The user successfully signed out of FxA</td>