chore: app start performance logs (WPB-23706)

app/src/main/kotlin/com/wire/android/WireApplication.kt

@@ -39,6 +39,7 @@ import com.wire.android.feature.analytics.globalAnalyticsManager
 import com.wire.android.feature.analytics.model.AnalyticsEvent
 import com.wire.android.feature.analytics.model.AnalyticsSettings
 import com.wire.android.util.AppNameUtil
+import com.wire.android.util.AppPerformanceTracker
 import com.wire.android.util.CurrentScreenManager
 import com.wire.android.util.DataDogLogger
 import com.wire.android.util.logging.LogFileWriter
@@ -115,6 +116,7 @@ class WireApplication : BaseApp() {
 
     override fun onCreate() {
         super.onCreate()
+        AppPerformanceTracker.markAppStart()
 
         enableStrictMode()
 

app/src/main/kotlin/com/wire/android/ui/WireActivity.kt

@@ -117,6 +117,7 @@ import com.wire.android.ui.theme.ThemeOption
 import com.wire.android.ui.theme.WireTheme
 import com.wire.android.ui.userprofile.self.dialog.LogoutOptionsDialog
 import com.wire.android.ui.userprofile.self.dialog.LogoutOptionsDialogState
+import com.wire.android.util.AppPerformanceTracker
 import com.wire.android.util.CurrentScreenManager
 import com.wire.android.util.LocalSyncStateObserver
 import com.wire.android.util.ShakeDetector
@@ -208,6 +209,11 @@ class WireActivity : AppCompatActivity() {
                 InitialAppState.ENROLL_E2EI -> E2EIEnrollmentScreenDestination()
                 InitialAppState.LOGGED_IN -> HomeScreenDestination()
             }
+
+            if (viewModel.initialAppState() != InitialAppState.LOGGED_IN) {
+                AppPerformanceTracker.cancelAppStartTracking()
+            }
+
             appLogger.i("$TAG composable content")
             setComposableContent(startDestination)
 

app/src/main/kotlin/com/wire/android/ui/WireActivityViewModel.kt

@@ -49,6 +49,7 @@ import com.wire.android.ui.common.dialogs.CustomServerNoNetworkDialogState
 import com.wire.android.ui.joinConversation.JoinConversationViaCodeState
 import com.wire.android.ui.theme.Accent
 import com.wire.android.ui.theme.ThemeOption
+import com.wire.android.util.AppPerformanceTracker
 import com.wire.android.util.CurrentScreen
 import com.wire.android.util.CurrentScreenManager
 import com.wire.android.util.deeplink.DeepLinkProcessor
@@ -353,11 +354,15 @@ class WireActivityViewModel @Inject constructor(
                     result.key,
                     result.domain
                 ) { conversationId ->
+                    AppPerformanceTracker.markNotificationOpen()
                     sendAction(OpenConversation(DeepLinkResult.OpenConversation(conversationId, result.switchedAccount)))
                 }
 
                 is DeepLinkResult.MigrationLogin -> sendAction(OnMigrationLogin(result))
-                is DeepLinkResult.OpenConversation -> sendAction(OpenConversation(result))
+                is DeepLinkResult.OpenConversation -> {
+                    AppPerformanceTracker.markNotificationOpen()
+                    sendAction(OpenConversation(result))
+                }
                 is DeepLinkResult.OpenOtherUserProfile -> onOpenUserProfileDeepLink(result)
 
                 DeepLinkResult.SharingIntent -> sendAction(OnShowImportMediaScreen)

app/src/main/kotlin/com/wire/android/ui/home/conversations/messages/ConversationMessagesViewModel.kt

@@ -27,6 +27,7 @@ import androidx.lifecycle.ViewModel
 import androidx.lifecycle.viewModelScope
 import com.wire.android.R
 import com.wire.android.appLogger
+import com.wire.android.util.AppPerformanceTracker
 import com.wire.android.media.audiomessage.ConversationAudioMessagePlayer
 import com.wire.android.model.SnackBarMessage
 import com.wire.android.ui.common.visbility.VisibilityState
@@ -216,6 +217,7 @@ class ConversationMessagesViewModel @Inject constructor(
             messages = paginatedMessagesFlow,
             firstUnreadEventIndex = max(lastReadIndex - 1, 0)
         )
+        AppPerformanceTracker.logConversationMessagesReady()
 
         handleSelectedSearchedMessageHighlighting()
     }

app/src/main/kotlin/com/wire/android/ui/home/conversationslist/ConversationListViewModel.kt

@@ -28,6 +28,7 @@ import androidx.paging.cachedIn
 import androidx.paging.insertSeparators
 import androidx.paging.map
 import com.wire.android.BuildConfig
+import com.wire.android.util.AppPerformanceTracker
 import com.wire.android.di.CurrentAccount
 import com.wire.android.mapper.UserTypeMapper
 import com.wire.android.mapper.toConversationItem
@@ -74,6 +75,7 @@ import kotlinx.coroutines.flow.flatMapLatest
 import kotlinx.coroutines.flow.flowOn
 import kotlinx.coroutines.flow.map
 import kotlinx.coroutines.flow.onStart
+import kotlinx.coroutines.flow.take
 import kotlinx.coroutines.launch
 
 @Suppress("TooManyFunctions")
@@ -195,7 +197,13 @@ class ConversationListViewModelImpl @AssistedInject constructor(
 
     init {
         observeSelfUserLegalHoldState()
-        if (!usePagination) {
+        if (usePagination) {
+            viewModelScope.launch {
+                conversationsPaginatedFlow.take(1).collect {
+                    AppPerformanceTracker.logConversationsReady()
+                }
+            }
+        } else {
             observeNonPaginatedSearchConversationList()
         }
     }
@@ -247,6 +255,7 @@ class ConversationListViewModelImpl @AssistedInject constructor(
                 }
                 .flowOn(dispatcher.io())
                 .collect {
+                    AppPerformanceTracker.logConversationsReady()
                     conversationListState = ConversationListState.NotPaginated(
                         isLoading = false,
                         conversations = it,

app/src/main/kotlin/com/wire/android/util/AppPerformanceTracker.kt

@@ -0,0 +1,61 @@
+/*
+ * Wire
+ * Copyright (C) 2026 Wire Swiss GmbH
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see http://www.gnu.org/licenses/.
+ */
+
+package com.wire.android.util
+
+import android.os.SystemClock
+import com.wire.android.appLogger
+
+/**
+ * Captures timestamps at key app entry points and logs elapsed durations for DataDog Logs.
+ */
+object AppPerformanceTracker {
+
+    @Volatile private var appStartTime: Long? = null
+
+    @Volatile private var notificationOpenTime: Long? = null
+
+    fun markAppStart() {
+        appStartTime = SystemClock.elapsedRealtime()
+    }
+
+    // Called when the startup path will NOT lead to the conversations list (e.g. user not logged in).
+    fun cancelAppStartTracking() {
+        appStartTime = null
+    }
+
+    fun logConversationsReady() {
+        appStartTime?.let {
+            val durationMs = SystemClock.elapsedRealtime() - it
+            appLogger.i("Perf | event=conversations_list_ready | duration_ms=$durationMs")
+            appStartTime = null
+        }
+    }
+
+    fun markNotificationOpen() {
+        notificationOpenTime = SystemClock.elapsedRealtime()
+    }
+
+    fun logConversationMessagesReady() {
+        notificationOpenTime?.let {
+            val durationMs = SystemClock.elapsedRealtime() - it
+            appLogger.i("Perf | event=conversation_messages_ready | duration_ms=$durationMs")
+            notificationOpenTime = null
+        }
+    }
+}