fix(profiling): Fix app start transaction profile timestamp offset

CHANGELOG.md

@@ -8,6 +8,10 @@
 
 ## Unreleased
 
+### Fixes
+
+- Fix app start transaction profile offset by using the actual profiling start timestamp instead of the adjusted app start time ([#4511](https://github.com/getsentry/sentry-react-native/issues/4511))
+
 ### Features
 
 - Enable "Open Sentry" button in Playground for Expo apps ([#5947](https://github.com/getsentry/sentry-react-native/pull/5947))

packages/core/src/js/profiling/integration.ts

@@ -279,9 +279,13 @@ export function stopProfiling(
     return null;
   }
 
+  hermesProfileEvent.profilingStartTimestampNs = profileStartTimestampNs;
+
   if (collectedProfiles.androidProfile) {
     const durationNs = profileEndTimestampNs - profileStartTimestampNs;
-    return createAndroidWithHermesProfile(hermesProfileEvent, collectedProfiles.androidProfile, durationNs);
+    const androidProfile = createAndroidWithHermesProfile(hermesProfileEvent, collectedProfiles.androidProfile, durationNs);
+    androidProfile.profilingStartTimestampNs = profileStartTimestampNs;
+    return androidProfile;
   } else if (collectedProfiles.nativeProfile) {
     return addNativeProfileToHermesProfile(hermesProfileEvent, collectedProfiles.nativeProfile);
   }

packages/core/src/js/profiling/types.ts

@@ -15,6 +15,7 @@ export type HermesProfileEvent = {
   transaction: {
     active_thread_id: string;
   };
+  profilingStartTimestampNs?: number;
 };
 
 /*
@@ -31,6 +32,7 @@ export type AndroidCombinedProfileEvent = {
   android_api_level: number;
   duration_ns: string;
   active_thread_id: string;
+  profilingStartTimestampNs?: number;
 };
 
 /*

packages/core/src/js/profiling/utils.ts

@@ -88,14 +88,20 @@ export function enrichCombinedProfileWithEventContext(
     }
   }
 
+  const { profilingStartTimestampNs, ...profileWithoutInternalFields } = profile;
+
   return {
-    ...profile,
+    ...profileWithoutInternalFields,
     event_id: profile_id,
     runtime: {
       name: 'hermes',
       version: '', // TODO: get hermes version
     },
-    timestamp: event.start_timestamp ? new Date(event.start_timestamp * 1000).toISOString() : new Date().toISOString(),
+    timestamp: profilingStartTimestampNs
+      ? new Date(profilingStartTimestampNs / 1e6).toISOString()
+      : event.start_timestamp
+        ? new Date(event.start_timestamp * 1000).toISOString()
+        : new Date().toISOString(),
     release: event.release || '',
     environment: event.environment || getDefaultEnvironment(),
     os: {
@@ -130,8 +136,10 @@ export function enrichAndroidProfileWithEventContext(
   profile: AndroidCombinedProfileEvent,
   event: Event,
 ): AndroidProfileEvent | null {
+  const { profilingStartTimestampNs, ...profileWithoutInternalFields } = profile;
+
   return {
-    ...profile,
+    ...profileWithoutInternalFields,
     debug_meta: {
       images: getDebugMetadata(),
     },
@@ -152,7 +160,11 @@ export function enrichAndroidProfileWithEventContext(
 
     profile_id,
 
-    timestamp: event.start_timestamp ? new Date(event.start_timestamp * 1000).toISOString() : new Date().toISOString(),
+    timestamp: profilingStartTimestampNs
+      ? new Date(profilingStartTimestampNs / 1e6).toISOString()
+      : event.start_timestamp
+        ? new Date(event.start_timestamp * 1000).toISOString()
+        : new Date().toISOString(),
 
     release: event.release || '',
     dist: event.dist || '',