fix(profiling): Fix app start transaction profile timestamp offset#5962
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fix(profiling): Fix app start transaction profile timestamp offset#5962
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Use the actual profiling start timestamp for the profile's timestamp field instead of the adjusted transaction start_timestamp. For app start transactions, the transaction start is adjusted backward to the app start time, but the profile samples are relative to when profiling actually started (JS VM start). This caused a misalignment in the Sentry UI. Fixes #4511 Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Semver Impact of This PR⚪ None (no version bump detected) 📋 Changelog PreviewThis is how your changes will appear in the changelog.
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antonis
commented
Apr 7, 2026
Add unit tests for enrichCombinedProfileWithEventContext and enrichAndroidProfileWithEventContext verifying that: - profilingStartTimestampNs is used for the profile timestamp when set - Falls back to event.start_timestamp when not set - profilingStartTimestampNs is stripped from serialized output Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Sentry Build Distribution
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Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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📢 Type of change
📜 Description
Uses the actual profiling start timestamp for the profile's
timestampfield instead of the adjustedevent.start_timestamp.For app start transactions, the SDK adjusts the transaction's
start_timestampbackward to the app start time. However, profile samples useelapsed_since_start_nsrelative to when profiling actually started (JS VM start), not the app start time. This mismatch caused the profile to appear misaligned in the Sentry UI.Changes:
profilingStartTimestampNsfield toHermesProfileEventandAndroidCombinedProfileEventtypesstopProfilingnow stores the profiling start timestamp on the returned profile eventenrichCombinedProfileWithEventContextandenrichAndroidProfileWithEventContextprefer the stored profiling start timestamp overevent.start_timestamp💡 Motivation and Context
Fixes #4511
When an app start transaction has its start time adjusted, the profile timestamp was incorrectly set to the app start time, while profile samples were relative to the JS VM start. This caused a visual offset in the Sentry profiling UI.
Relay does not validate the profile
timestampagainst the transactionstart_timestamp, so this change is safe from the ingestion side.💚 How did you test it?
📝 Checklist
sendDefaultPIIis enabled🔮 Next steps