Update naming

flutter/android/src/main/kotlin/io/sentry/flutter/SentryFlutterPlugin.kt

@@ -36,10 +36,10 @@ class SentryFlutterPlugin : FlutterPlugin, MethodCallHandler, ActivityAware {
 
   private var activity: WeakReference<Activity>? = null
   private var framesTracker: ActivityFramesTracker? = null
-  private var engineEndTime: Long? = null
+  private var engineReadyEndtime: Long? = null
 
   override fun onAttachedToEngine(flutterPluginBinding: FlutterPlugin.FlutterPluginBinding) {
-    engineEndTime = System.currentTimeMillis()
+    engineReadyEndtime = System.currentTimeMillis()
 
     context = flutterPluginBinding.applicationContext
     channel = MethodChannel(flutterPluginBinding.binaryMessenger, "sentry_flutter")
@@ -149,7 +149,7 @@ class SentryFlutterPlugin : FlutterPlugin, MethodCallHandler, ActivityAware {
   }
 
   private fun fetchEngineReadyEndtime(result: Result) {
-    result.success(engineEndTime)
+    result.success(engineReadyEndtime)
   }
 
   private fun beginNativeFrames(result: Result) {

flutter/ios/Classes/SentryFlutterPluginApple.swift

@@ -26,12 +26,12 @@ public class SentryFlutterPluginApple: NSObject, FlutterPlugin {
 #endif
     }
 
-    private static var engineEndtime: Int64 = 0
+    private static var engineReadyEndtime: Int64 = 0
 
     public static func register(with registrar: FlutterPluginRegistrar) {
         let currentDate = Date()
         let timeInterval = currentDate.timeIntervalSince1970
-        engineEndtime = Int64(timeInterval * 1000)
+        engineReadyEndtime = Int64(timeInterval * 1000)
 
 #if os(iOS)
         let channel = FlutterMethodChannel(name: "sentry_flutter", binaryMessenger: registrar.messenger())
@@ -86,7 +86,7 @@ public class SentryFlutterPluginApple: NSObject, FlutterPlugin {
     }
 
     private func fetchEngineReadyEndtime(result: @escaping FlutterResult) {
-        result(SentryFlutterPluginApple.engineEndtime)
+        result(SentryFlutterPluginApple.engineReadyEndtime)
     }
 
     // swiftlint:disable:next cyclomatic_complexity

flutter/lib/src/integrations/native_app_start_integration.dart

@@ -71,20 +71,20 @@ class NativeAppStartIntegration extends Integration<SentryFlutterOptions> {
         _native.appStartEnd ??= options.clock();
         final appStartEnd = _native.appStartEnd;
         final nativeAppStart = await _native.fetchNativeAppStart();
-        final engineEndtime = await _native.fetchEngineReadyEndtime();
+        final engineReadyEndtime = await _native.fetchEngineReadyEndtime();
         final dartLoadingEnd = SentryFlutter.dartLoadingEnd;
 
         if (nativeAppStart == null ||
             appStartEnd == null ||
-            engineEndtime == null) {
+            engineReadyEndtime == null) {
           return;
         }
 
         final appStartDateTime = DateTime.fromMillisecondsSinceEpoch(
             nativeAppStart.appStartTime.toInt());
         final duration = appStartEnd.difference(appStartDateTime);
         final engineEndDatetime =
-            DateTime.fromMillisecondsSinceEpoch(engineEndtime);
+            DateTime.fromMillisecondsSinceEpoch(engineReadyEndtime);
 
         // We filter out app start more than 60s.
         // This could be due to many different reasons.

flutter/test/integrations/native_app_start_integration_test.dart

@@ -195,10 +195,10 @@ void main() {
     });
 
     test('have correct endTimestamp', () async {
-      final engineEndtime = await fixture.native.fetchEngineReadyEndtime();
+      final engineReadyEndtime = await fixture.native.fetchEngineReadyEndtime();
       expect(coldStartSpan?.endTimestamp, fixture.native.appStartEnd?.toUtc());
       expect(engineReadySpan?.endTimestamp,
-          DateTime.fromMillisecondsSinceEpoch(engineEndtime!).toUtc());
+          DateTime.fromMillisecondsSinceEpoch(engineReadyEndtime!).toUtc());
       expect(dartIsolateLoadingSpan?.endTimestamp,
           SentryFlutter.dartLoadingEnd.toUtc());
       expect(firstFrameRenderSpan?.endTimestamp, coldStartSpan?.endTimestamp);