feat(tracing): Copy app start vitals onto standalone children by buenaflor · Pull Request #6631 · getsentry/sentry-react-native

buenaflor · 2026-08-28T10:49:29Z

📢 Type of change

Bugfix
New feature
Enhancement
Refactoring

📜 Description

Copy app.vitals.start.type and app.vitals.start.screen from the standalone app.start root onto every child span, including SDK breakdown spans and user spans under app.start.extended.

app.vitals.start.value stays on the root only. Screen is omitted when no route has been registered. The non-standalone ui.load path is unchanged. Deadline / suppressed-measurement captures still omit these vitals on both the root and children.

💡 Motivation and Context

Mobile vitals grouping/drill-down queries app.vitals.start.type and app.vitals.start.screen on child spans. Those attributes were only on the standalone app.start root, so breakdown and user-added children did not group with the root.

Matches Android (getsentry/sentry-java#6005) and Flutter (getsentry/sentry-dart#3988).

Related to getsentry/sentry#122577

💚 How did you test it?

Unit tests in packages/core/test/tracing/integrations/appStart.test.ts covering SDK children, native spans, no-screen, extended/user descendants, deadline suppression, and non-standalone non-propagation
Updated the locked standalone app start snapshot
yarn workspace @sentry/react-native test:sdk (1904 passing)

📝 Checklist

I added tests to verify changes.
No new PII added or SDK only sends newly added PII if sendDefaultPII is enabled.
I updated the docs if needed.
I updated the wizard if needed.
All tests passing.
Public API changes reviewed by another Mobile SDK team member or implemented according to the develop docs spec.
No breaking changes.

🔮 Next steps

Mobile vitals grouping queries app.vitals.start.type and app.vitals.start.screen on child spans. Those attributes were only on the standalone app.start root, so breakdown and user spans under app.start.extended did not group with the root. Co-Authored-By: Cursor <cursoragent@cursor.com>

github-actions · 2026-08-28T10:50:24Z

Semver Impact of This PR

⚪ None (no version bump detected)

📋 Changelog Preview

This is how your changes will appear in the changelog.
Entries from this PR are highlighted with a left border (blockquote style).

feat(tracing): Copy app start vitals onto standalone children by buenaflor in #6631

chore(deps): update Cocoa SDK to v9.26.1 by github-actions in #6623
fix(ios): Force-load the Sentry static archive to keep ObjC category methods by antonis in #6615
feat(core): Forward feature flag evaluations to the native SDKs by antonis in #6613
chore(deps): update Android SDK to v8.54.0 by github-actions in #6624
chore(deps): update Sentry Android Gradle Plugin to v6.20.0 by github-actions in #6627

_{🤖 This preview updates automatically when you update the PR.}

github-actions · 2026-08-28T10:56:05Z

	Messages
📖	Do not forget to update Sentry-docs with your feature once the pull request gets approved.

Generated by 🚫 dangerJS against cd7ee01

Copilot

Pull request overview

Adds propagation of standalone app-start vitals dimensions (app.vitals.start.type, app.vitals.start.screen) from the root app.start transaction onto all child spans so downstream mobile vitals grouping/drill-down works consistently (including breakdown spans, native spans, and user spans under app.start.extended). The root-only behavior for app.vitals.start.value, the non-standalone ui.load path, and the deadline/suppressed-measurement behavior are preserved.

Changes:

Copy app.vitals.start.type / app.vitals.start.screen from standalone app.start root trace data onto every event.spans[] entry.
Expand unit test coverage for standalone children propagation (incl. native spans, no-screen behavior, extended/user descendants, and suppression paths).
Update locked snapshot and document the feature in CHANGELOG.md.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
packages/core/src/js/tracing/integrations/appStart.ts	Adds `copyStandaloneAppStartVitalsToChildren` and wires it into the standalone attach flow.
packages/core/test/tracing/integrations/appStart.test.ts	Adds assertions/helpers to validate vitals propagation to standalone child spans (incl. extended/user descendants).
packages/core/test/tracing/integrations/snapshots/appStart.test.ts.snap	Updates the locked standalone snapshot to reflect vitals on child span data.
CHANGELOG.md	Notes the new standalone child-span vitals propagation behavior.

💡 Add a code-review agent skill or configure MCP servers for context-aware, tailored reviews. Learn more in the docs.

sentry · 2026-08-28T11:33:47Z

📲 Install Builds

Android

🔗 App Name	App ID	Version	Configuration
Sentry RN	io.sentry.reactnative.sample	8.24.0 (104)	Release

⚙️ sentry-react-native Build Distribution Settings

github-actions · 2026-08-28T11:36:41Z

Android (legacy) Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	428.62 ms	456.81 ms	28.19 ms
Size	49.74 MiB	55.66 MiB	5.91 MiB

Baseline results on branch: main

Startup times

Revision	Plain	With Sentry	Diff
`8e18f68`+dirty	426.20 ms	456.44 ms	30.24 ms
`038a6d7`+dirty	524.82 ms	531.92 ms	7.10 ms
`a858ac3`+dirty	426.50 ms	484.82 ms	58.32 ms
`822d35b`+dirty	429.31 ms	498.04 ms	68.73 ms
`5ca03f9`+dirty	423.30 ms	467.00 ms	43.70 ms
`083e3ef`+dirty	446.67 ms	491.68 ms	45.01 ms
`4953e94`+dirty	442.02 ms	456.52 ms	14.50 ms
`244f6e8`+dirty	424.36 ms	488.29 ms	63.92 ms
`2e64504`+dirty	450.52 ms	482.70 ms	32.18 ms
`a9df5ce`+dirty	418.40 ms	452.38 ms	33.98 ms

App size

Revision	Plain	With Sentry	Diff
`8e18f68`+dirty	49.74 MiB	55.45 MiB	5.71 MiB
`038a6d7`+dirty	48.30 MiB	53.60 MiB	5.30 MiB
`a858ac3`+dirty	49.74 MiB	55.08 MiB	5.34 MiB
`822d35b`+dirty	49.74 MiB	54.84 MiB	5.10 MiB
`5ca03f9`+dirty	49.74 MiB	55.26 MiB	5.52 MiB
`083e3ef`+dirty	49.74 MiB	55.36 MiB	5.61 MiB
`4953e94`+dirty	43.75 MiB	48.08 MiB	4.33 MiB
`244f6e8`+dirty	49.74 MiB	55.38 MiB	5.63 MiB
`2e64504`+dirty	49.74 MiB	55.45 MiB	5.71 MiB
`a9df5ce`+dirty	49.74 MiB	55.36 MiB	5.62 MiB

github-actions · 2026-08-28T11:37:16Z

iOS (legacy) Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	3854.74 ms	1217.45 ms	-2637.30 ms
Size	5.08 MiB	6.80 MiB	1.72 MiB

Baseline results on branch: main

Startup times

Revision	Plain	With Sentry	Diff
`64630e5`+dirty	3842.70 ms	1218.11 ms	-2624.60 ms
`b0d3373`+dirty	3831.75 ms	1227.29 ms	-2604.46 ms
`b04af96`+dirty	3818.92 ms	1219.76 ms	-2599.16 ms
`3d31fcf`+dirty	3838.09 ms	1223.46 ms	-2614.63 ms
`a0a3177`+dirty	3844.73 ms	1225.23 ms	-2619.51 ms
`af33f3b`+dirty	3849.98 ms	1236.45 ms	-2613.53 ms
`09a902f`+dirty	3835.67 ms	1217.11 ms	-2618.57 ms
`5a316ea`+dirty	3820.11 ms	1211.28 ms	-2608.83 ms
`403b9f3`+dirty	3832.18 ms	1213.32 ms	-2618.87 ms
`acd838e`+dirty	3849.78 ms	1230.00 ms	-2619.78 ms

App size

Revision	Plain	With Sentry	Diff
`64630e5`+dirty	4.98 MiB	6.46 MiB	1.49 MiB
`b0d3373`+dirty	5.15 MiB	6.68 MiB	1.53 MiB
`b04af96`+dirty	4.98 MiB	6.54 MiB	1.56 MiB
`3d31fcf`+dirty	4.98 MiB	6.56 MiB	1.58 MiB
`a0a3177`+dirty	4.98 MiB	6.55 MiB	1.58 MiB
`af33f3b`+dirty	4.98 MiB	6.51 MiB	1.54 MiB
`09a902f`+dirty	4.98 MiB	6.46 MiB	1.49 MiB
`5a316ea`+dirty	4.98 MiB	6.51 MiB	1.53 MiB
`403b9f3`+dirty	5.08 MiB	6.72 MiB	1.64 MiB
`acd838e`+dirty	5.15 MiB	6.70 MiB	1.55 MiB

github-actions · 2026-08-28T11:49:57Z

iOS (new) Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	3831.78 ms	1214.85 ms	-2616.92 ms
Size	5.08 MiB	6.80 MiB	1.72 MiB

Baseline results on branch: main

Startup times

Revision	Plain	With Sentry	Diff
`3ce5254`+dirty	1217.70 ms	1224.69 ms	6.99 ms
`0b1b5e3`+dirty	3820.72 ms	1207.94 ms	-2612.78 ms
`44abcc2`+dirty	3841.42 ms	1214.77 ms	-2626.65 ms
`1d3572b`+dirty	3830.71 ms	1222.23 ms	-2608.49 ms
`6177334`+dirty	3851.52 ms	1226.23 ms	-2625.29 ms
`5ee78d6`+dirty	3815.71 ms	1217.04 ms	-2598.67 ms
`083e3ef`+dirty	3871.96 ms	1234.95 ms	-2637.01 ms
`ce7b368`+dirty	3851.41 ms	1222.37 ms	-2629.04 ms
`7887847`+dirty	3844.89 ms	1221.67 ms	-2623.22 ms
`1122a96`+dirty	3839.17 ms	1219.23 ms	-2619.93 ms

App size

Revision	Plain	With Sentry	Diff
`3ce5254`+dirty	3.38 MiB	4.76 MiB	1.38 MiB
`0b1b5e3`+dirty	5.15 MiB	6.70 MiB	1.54 MiB
`44abcc2`+dirty	4.98 MiB	6.55 MiB	1.57 MiB
`1d3572b`+dirty	4.98 MiB	6.56 MiB	1.58 MiB
`6177334`+dirty	5.15 MiB	6.68 MiB	1.53 MiB
`5ee78d6`+dirty	5.15 MiB	6.69 MiB	1.53 MiB
`083e3ef`+dirty	4.98 MiB	6.55 MiB	1.57 MiB
`ce7b368`+dirty	4.98 MiB	6.51 MiB	1.53 MiB
`7887847`+dirty	4.98 MiB	6.46 MiB	1.48 MiB
`1122a96`+dirty	5.15 MiB	6.68 MiB	1.53 MiB

github-actions · 2026-08-28T11:50:15Z

Android (new) Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	437.18 ms	462.73 ms	25.55 ms
Size	49.74 MiB	55.66 MiB	5.91 MiB

Baseline results on branch: main

Startup times

Revision	Plain	With Sentry	Diff
`8e18f68`+dirty	443.14 ms	446.98 ms	3.84 ms
`ca9d079`+dirty	460.67 ms	512.54 ms	51.87 ms
`c151573`+dirty	485.39 ms	495.18 ms	9.79 ms
`5a21b51`+dirty	505.16 ms	539.20 ms	34.04 ms
`ecf47a2`+dirty	457.21 ms	498.10 ms	40.89 ms
`1d3572b`+dirty	444.48 ms	478.42 ms	33.94 ms
`3ce5254`+dirty	373.90 ms	427.84 ms	53.94 ms
`9b5615c`+dirty	428.67 ms	490.15 ms	61.48 ms
`2e64504`+dirty	488.33 ms	541.31 ms	52.98 ms
`ad66da3`+dirty	411.49 ms	449.38 ms	37.89 ms

App size

Revision	Plain	With Sentry	Diff
`8e18f68`+dirty	49.74 MiB	55.45 MiB	5.71 MiB
`ca9d079`+dirty	48.30 MiB	53.58 MiB	5.28 MiB
`c151573`+dirty	48.30 MiB	53.54 MiB	5.24 MiB
`5a21b51`+dirty	48.30 MiB	53.49 MiB	5.19 MiB
`ecf47a2`+dirty	49.74 MiB	54.82 MiB	5.07 MiB
`1d3572b`+dirty	49.74 MiB	55.38 MiB	5.63 MiB
`3ce5254`+dirty	43.94 MiB	48.98 MiB	5.04 MiB
`9b5615c`+dirty	49.74 MiB	55.09 MiB	5.34 MiB
`2e64504`+dirty	49.74 MiB	55.45 MiB	5.71 MiB
`ad66da3`+dirty	48.30 MiB	53.49 MiB	5.19 MiB

antonis

LGTM 🚢
Thank you for handling this Gino 🙇

Merge branch 'main' into feat/standalone-app-start-child-vitals

cd7ee01

buenaflor marked this pull request as ready for review August 28, 2026 11:16

buenaflor requested review from alwx, antonis and lucas-zimerman as code owners August 28, 2026 11:16

Copilot AI lite review requested due to automatic review settings August 28, 2026 11:16

Copilot started reviewing on behalf of buenaflor August 28, 2026 11:17 View session

Copilot AI reviewed Aug 28, 2026

View reviewed changes

Comment thread packages/core/test/tracing/integrations/appStart.test.ts

buenaflor added the ready-to-merge Triggers the full CI test suite label Aug 28, 2026

antonis approved these changes Aug 28, 2026

View reviewed changes

antonis merged commit 695c88a into main Aug 28, 2026
117 of 122 checks passed

antonis deleted the feat/standalone-app-start-child-vitals branch August 28, 2026 12:09

Uh oh!

Uh oh!

Conversation

buenaflor commented Aug 28, 2026 • edited Loading Uh oh! There was an error while loading. Please reload this page.

Uh oh!

📢 Type of change

📜 Description

💡 Motivation and Context

💚 How did you test it?

📝 Checklist

🔮 Next steps

Uh oh!

github-actions Bot commented Aug 28, 2026

Semver Impact of This PR

Uh oh!

github-actions Bot commented Aug 28, 2026 • edited Loading Uh oh! There was an error while loading. Please reload this page.

Uh oh!

Uh oh!

Copilot AI left a comment

Choose a reason for hiding this comment

Pull request overview

Reviewed changes

Uh oh!

Uh oh!

sentry Bot commented Aug 28, 2026

📲 Install Builds

Android

Uh oh!

github-actions Bot commented Aug 28, 2026

Android (legacy) Performance metrics 🚀

Baseline results on branch: main

Startup times

App size

Uh oh!

github-actions Bot commented Aug 28, 2026

iOS (legacy) Performance metrics 🚀

Baseline results on branch: main

Startup times

App size

Uh oh!

github-actions Bot commented Aug 28, 2026

iOS (new) Performance metrics 🚀

Baseline results on branch: main

Startup times

App size

Uh oh!

github-actions Bot commented Aug 28, 2026

Android (new) Performance metrics 🚀

Baseline results on branch: main

Startup times

App size

Uh oh!

antonis left a comment

Choose a reason for hiding this comment

Uh oh!

Uh oh!

Reviewers

Assignees

Labels

Projects

Milestone

Development

Uh oh!

3 participants

buenaflor commented Aug 28, 2026 •

edited

Loading

github-actions Bot commented Aug 28, 2026 •

edited

Loading