Add names to app launch vitals

Author: aleksandr-gringauz

features/dd-sdk-android-rum/src/main/kotlin/com/datadog/android/rum/internal/domain/scope/RumVitalAppLaunchEventHelper.kt

@@ -144,7 +144,7 @@ internal class RumVitalAppLaunchEventHelper(
             ddtags = buildDDTagsString(datadogContext),
             vital = RumVitalAppLaunchEvent.Vital(
                 id = UUID.randomUUID().toString(),
-                name = null,
+                name = appLaunchMetric.vitalName(),
                 description = null,
                 appLaunchMetric = appLaunchMetric,
                 duration = durationNs,
@@ -155,3 +155,10 @@ internal class RumVitalAppLaunchEventHelper(
         )
     }
 }
+
+private fun RumVitalAppLaunchEvent.AppLaunchMetric.vitalName(): String {
+    return when (this) {
+        RumVitalAppLaunchEvent.AppLaunchMetric.TTID -> "time_to_initial_display"
+        RumVitalAppLaunchEvent.AppLaunchMetric.TTFD -> "time_to_full_display"
+    }
+}

features/dd-sdk-android-rum/src/test/kotlin/com/datadog/android/rum/internal/startup/RumSessionScopeStartupManagerTest.kt

@@ -693,7 +693,7 @@ internal class RumSessionScopeStartupManagerTest {
         val vital = value.vital
 
         assertThat(vital).apply {
-            hasName(null)
+            hasName("time_to_initial_display")
             hasDescription(null)
             hasAppLaunchMetric(RumVitalAppLaunchEvent.AppLaunchMetric.TTID)
             hasDuration(info.durationNs)
@@ -745,7 +745,7 @@ internal class RumSessionScopeStartupManagerTest {
         val vital = value.vital
 
         assertThat(vital).apply {
-            hasName(null)
+            hasName("time_to_full_display")
             hasDescription(null)
             hasAppLaunchMetric(RumVitalAppLaunchEvent.AppLaunchMetric.TTFD)
             hasDuration(durationNs)