feat: Standalone app start tracing by philipphofmann · Pull Request #7660 · getsentry/sentry-cocoa

philipphofmann · 2026-03-10T09:15:55Z

📜 Description

Send app start data as a standalone transaction instead of attaching it to the first UIViewController transaction.

The measurement is passed directly via SentryTracerConfiguration, avoiding the global static and its race conditions.

We intentionally don't add public user-facing docs for this because this is more of a proof of concept for #6883 that we still need to iterate on before we want a larger audience to try it. The Sentry product doesn't handle these standalone app start transactions yet.

💡 Motivation and Context

Fixes #6883

💚 How did you test it?

Unit tests
End-to-end regression test: Ran the iOS-Swift sample app on a clean simulator with enableStandaloneAppStartTracing = false on this branch and compared against main. Both produce identical transaction structure (same operations, same hierarchy: Cold Start grouping span with 5 child phase spans under the ui.load transaction). No regression.

Regression test run 2 — 2026-03-12T10:42Z

Method

Added a unique regression-test scope tag to identify each run
Erased the simulator between runs for clean cold starts
Built and launched iOS-Swift on each branch, waited ~15s, stopped the app
Compared transactions via Sentry MCP (search_events + get_trace_details)

Results

Property	Feature Branch	Main Branch
Tag	`regression-test-feature-branch-2`	`regression-test-main-branch-2`
Trace ID	`2279393e2bdd4126a29efeda00dd946b`	`7a1bb60029c842fea30b0e289e507b81`
Total spans	27 ¹	26
App start spans	6 (`Cold Start` + 5 phases)	6 (`Cold Start` + 5 phases)
Transaction op	`ui.load`	`ui.load`

¹ The extra span is an unrelated profileLaunch file.write, not an app start span.

Full span comparison (sorted by duration desc)

Span Description	Operation	Feature Branch	Main Branch
ErrorsViewController	`ui.load`	1101ms	1051ms
ErrorsViewController initial display	`ui.load.initial_display`	945ms	831ms
ErrorsViewController full display	`ui.load.full_display`	945ms	831ms
Cold Start	`app.start.cold`	945ms	831ms
Pre Runtime Init	`app.start.cold`	465ms	478ms
POST http://localhost:8969/stream	`http.client`	159ms	227ms
Application Init	`app.start.cold`	177ms	139ms
UIKit Init	`app.start.cold`	161ms	92ms
Initial Frame Render	`app.start.cold`	141ms	120ms
loadView	`ui.load`	3ms	5ms
Runtime Init to Pre Main Initializers	`app.start.cold`	2ms	2ms
QmU-DD-itF-view-M6c-EX-0C6.nib	`file.read`	0.7ms	0.5ms
data.data (533 bytes)	`file.write`	0.5ms	0.2ms
Info.plist	`file.read`	0.3ms	0.4ms
Info-8.0+.plist	`file.read`	0.3ms	0.3ms
Sim.Touch.plist	`file.read`	0.3ms	0.3ms
Sim.Pencil.plist	`file.read`	0.2ms	0.3ms
viewDidAppear	`ui.load`	0.3ms	0.2ms
layoutSubViews	`ui.load`	0.2ms	0.2ms
viewDidLoad	`ui.load`	0.2ms	0.2ms
layoutSubViews	`ui.load`	0.2ms	0.2ms
viewWillLayoutSubviews	`ui.load`	0.02ms	0.03ms
viewWillLayoutSubviews	`ui.load`	0.02ms	0.02ms
viewWillAppear	`ui.load`	0.02ms	0.02ms
viewDidLayoutSubviews	`ui.load`	0.02ms	0.02ms
viewDidLayoutSubviews	`ui.load`	0.02ms	0.02ms

Sentry links

Regression test run 1 — 2026-03-12T09:20Z

Method

Added a unique regression-test scope tag to identify each run
Erased the simulator between runs for clean cold starts
Built and launched iOS-Swift on each branch, waited ~15s, stopped the app
Compared transactions via Sentry MCP (search_events + get_trace_details)

Results

Property	Feature Branch	Main Branch
Tag	`regression-test-feature-branch`	`regression-test-main-branch`
Trace ID	`3ff1c4e3c3754ab18ece26d7e0cf722a`	`3edc353029d34c9292f5ea85df4851ac`
Total spans	26	26
App start spans	6 (`Cold Start` + 5 phases)	6 (`Cold Start` + 5 phases)
Transaction op	`ui.load`	`ui.load`

Full span comparison (sorted by duration desc)

Span Description	Operation	Feature Branch	Main Branch
ErrorsViewController	`ui.load`	1152ms	1091ms
ErrorsViewController initial display	`ui.load.initial_display`	967ms	887ms
ErrorsViewController full display	`ui.load.full_display`	967ms	920ms
Cold Start	`app.start.cold`	967ms	887ms
Pre Runtime Init	`app.start.cold`	468ms	531ms
POST http://localhost:8969/stream	`http.client`	189ms	206ms
UIKit Init	`app.start.cold`	188ms	102ms
Initial Frame Render	`app.start.cold`	171ms	113ms
Application Init	`app.start.cold`	137ms	138ms
loadView	`ui.load`	4ms	5ms
Runtime Init to Pre Main Initializers	`app.start.cold`	2ms	2ms
QmU-DD-itF-view-M6c-EX-0C6.nib	`file.read`	0.5ms	0.6ms
Info.plist	`file.read`	0.4ms	0.4ms
Info-8.0+.plist	`file.read`	0.3ms	0.3ms
data.data (533 bytes)	`file.write`	0.3ms	0.4ms
Sim.Pencil.plist	`file.read`	0.3ms	0.2ms
layoutSubViews	`ui.load`	0.3ms	0.3ms
Sim.Touch.plist	`file.read`	0.3ms	0.2ms
viewDidAppear	`ui.load`	0.2ms	0.2ms
viewDidLoad	`ui.load`	0.2ms	0.2ms
layoutSubViews	`ui.load`	0.07ms	0.08ms
viewWillLayoutSubviews	`ui.load`	0.03ms	0.03ms
viewWillAppear	`ui.load`	0.02ms	0.02ms
viewWillLayoutSubviews	`ui.load`	0.02ms	0.02ms
viewDidLayoutSubviews	`ui.load`	0.02ms	0.02ms
viewDidLayoutSubviews	`ui.load`	0.02ms	0.02ms

Sentry links

Reproducible prompt

Run an end-to-end regression test for app start tracing. Compare the current branch
(with enableStandaloneAppStartTracing = false) against main to verify no regression
in the UIViewController app start transaction.

Steps:
1. In SentrySDKWrapper.swift, set enableStandaloneAppStartTracing = false and add a
   unique scope tag: scope.setTag(value: "regression-test-feature-branch", key: "regression-test")
2. Erase the iOS simulator (xcrun simctl shutdown <ID> && xcrun simctl erase <ID>),
   boot it, build and run iOS-Swift scheme, wait 15 seconds, stop the app
3. Revert sample app changes, stash, checkout main
4. In SentrySDKWrapper.swift on main, add scope tag:
   scope.setTag(value: "regression-test-main-branch", key: "regression-test")
5. Erase the simulator again, boot, build and run iOS-Swift, wait 15 seconds, stop
6. Revert main changes, checkout back to feature branch, pop stash
7. Use Sentry MCP search_events to find transactions with tag regression-test for
   each branch in project 5428557 (sentry-sdks org)
8. Use get_trace_details and search_events to get all spans for both traces
9. Compare: span count, span operations, span descriptions, hierarchy structure.
   Durations will differ (expected). Everything else should match.
10. Update the PR description "How did you test it?" section with the comparison.

📝 Checklist

You have to check all boxes before merging:

I added tests to verify the 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.
Review from the native team if needed.
No breaking change or entry added to the changelog.
No breaking change for hybrid SDKs or communicated to hybrid SDKs.

github-actions · 2026-03-10T09:16:20Z

Semver Impact of This PR

🟡 Minor (new features)

📋 Changelog Preview

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

New Features ✨

Standalone app start tracing by philipphofmann in #7660

Internal Changes 🔧

Samples

Restructure samples and revert to sample-specific target names by philprime in #7659
Restructure iOS-Swift6 sample by philprime in #7656

Other

(deps) Update clang-format version by github-actions in #7675

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

github-actions · 2026-03-10T09:16:25Z

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

Generated by 🚫 dangerJS against dffab76

codecov · 2026-03-10T09:40:48Z

Codecov Report

❌ Patch coverage is 99.43820% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 85.563%. Comparing base (8180609) to head (dffab76).
⚠️ Report is 15 commits behind head on main.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
...s/AppStartTracking/AppStartReportingStrategy.swift	97.674%	1 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##              main     #7660       +/-   ##
=============================================
+ Coverage   85.546%   85.563%   +0.017%     
=============================================
  Files          487       489        +2     
  Lines        29660     29835      +175     
  Branches     12889     12949       +60     
=============================================
+ Hits         25373     25528      +155     
- Misses        4237      4257       +20     
  Partials        50        50

Files with missing lines	Coverage Δ
Sources/Sentry/SentryAppStartMeasurementProvider.m	`94.230% <100.000%> (+2.338%)`	⬆️
Sources/Sentry/SentryBuildAppStartSpans.m	`100.000% <100.000%> (ø)`
.../SentryDefaultUIViewControllerPerformanceTracker.m	`97.784% <100.000%> (+0.007%)`	⬆️
Sources/Sentry/SentryPerformanceTracker.m	`99.224% <100.000%> (+0.102%)`	⬆️
Sources/Sentry/SentryTracer.m	`99.049% <100.000%> (+0.791%)`	⬆️
Sources/Sentry/SentryTransactionContext.m	`83.478% <100.000%> (+2.105%)`	⬆️
...es/Swift/Helper/SentryEnabledFeaturesBuilder.swift	`100.000% <100.000%> (ø)`
...tions/AppStartTracking/SentryAppStartTracker.swift	`93.902% <100.000%> (+0.191%)`	⬆️
Sources/Swift/Options.swift	`100.000% <ø> (ø)`
Sources/Swift/SentryDependencyContainer.swift	`97.285% <100.000%> (+0.012%)`	⬆️
... and 2 more

... and 7 files with indirect coverage changes

Continue to review full report in Codecov by Sentry.

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Δ = absolute <relative> (impact), ø = not affected, ? = missing data
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github-actions · 2026-03-10T10:24:41Z

Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	1212.32 ms	1247.60 ms	35.29 ms
Size	24.14 KiB	1.16 MiB	1.14 MiB

Baseline results on branch: main

Startup times

Revision	Plain	With Sentry	Diff
`786f763`	1217.17 ms	1238.37 ms	21.20 ms
`909f4ae`	1222.85 ms	1253.26 ms	30.41 ms
`151b3ee`	1238.69 ms	1270.73 ms	32.05 ms
`85ee155`	1227.40 ms	1251.52 ms	24.12 ms
`66415de`	1221.21 ms	1253.28 ms	32.07 ms
`69745fc`	1226.70 ms	1259.72 ms	33.02 ms
`dff20e3`	1225.19 ms	1258.66 ms	33.47 ms
`670aba7`	1219.98 ms	1257.20 ms	37.23 ms
`da35aa2`	1224.21 ms	1249.00 ms	24.79 ms
`ec88236`	1219.04 ms	1253.69 ms	34.65 ms

App size

Revision	Plain	With Sentry	Diff
`786f763`	24.14 KiB	1.15 MiB	1.13 MiB
`909f4ae`	24.14 KiB	1.16 MiB	1.13 MiB
`151b3ee`	24.14 KiB	1.15 MiB	1.13 MiB
`85ee155`	24.14 KiB	1.16 MiB	1.13 MiB
`66415de`	24.14 KiB	1.16 MiB	1.13 MiB
`69745fc`	24.14 KiB	1.15 MiB	1.13 MiB
`dff20e3`	24.14 KiB	1.15 MiB	1.13 MiB
`670aba7`	24.14 KiB	1.16 MiB	1.13 MiB
`da35aa2`	24.14 KiB	1.15 MiB	1.13 MiB
`ec88236`	24.14 KiB	1.15 MiB	1.13 MiB

Previous results on branch: feat/standalone-app-start-tracing

Startup times

Revision	Plain	With Sentry	Diff
`9175efb`	1219.83 ms	1239.50 ms	19.67 ms
`7287df6`	1224.02 ms	1254.77 ms	30.75 ms
`42f95dd`	1222.20 ms	1257.02 ms	34.82 ms
`0d2ca60`	1229.17 ms	1261.09 ms	31.91 ms
`50bee10`	1228.36 ms	1267.13 ms	38.77 ms
`edbdb50`	1217.06 ms	1249.92 ms	32.86 ms
`89b00b8`	1218.33 ms	1255.14 ms	36.81 ms
`40d30ad`	1234.65 ms	1269.73 ms	35.09 ms
`8b737d8`	1222.43 ms	1252.96 ms	30.53 ms
`98def9b`	1216.00 ms	1249.29 ms	33.29 ms

App size

Revision	Plain	With Sentry	Diff
`9175efb`	24.14 KiB	1.12 MiB	1.10 MiB
`7287df6`	24.14 KiB	1.16 MiB	1.14 MiB
`42f95dd`	24.14 KiB	1.16 MiB	1.14 MiB
`0d2ca60`	24.14 KiB	1.12 MiB	1.10 MiB
`50bee10`	24.14 KiB	1.16 MiB	1.13 MiB
`edbdb50`	24.14 KiB	1.12 MiB	1.10 MiB
`89b00b8`	24.14 KiB	1.16 MiB	1.13 MiB
`40d30ad`	24.14 KiB	1.16 MiB	1.14 MiB
`8b737d8`	24.14 KiB	1.12 MiB	1.10 MiB
`98def9b`	24.14 KiB	1.16 MiB	1.14 MiB

philipphofmann

Review for Claude Code.

sentry · 2026-03-10T11:25:23Z

Sentry Build Distribution

App	Version	Configuration
App	9.6.0 (1)	Release

sentry · 2026-03-10T11:25:55Z

Sentry Build Distribution

App	Version	Configuration
App	9.6.0 (1)	Release

sentry · 2026-03-10T11:51:51Z

📲 Install Builds

iOS

🔗 App Name	App ID	Version	Configuration
SDK-Size	io.sentry.sample.SDK-Size	9.13.0 (1)	Release

⚙️ sentry-cocoa Build Distribution Settings

sentry · 2026-03-10T11:53:45Z

Sentry Build Distribution

App	Version	Configuration
App	9.6.0 (1)	Release

…vider Move the app start measurement retrieval logic from SentryTracer into a standalone SentryAppStartMeasurementProvider class to decouple it from the tracer and prepare for a future Swift rewrite. Agent transcript: https://claudescope.sentry.dev/share/-ySeYAQr0t_-TzVJYh7grS4nvSpo6f1NKAIEUc4__60

Call SentryAppStartMeasurementProvider.reset() directly from ClearTestState and the provider tests instead of routing through SentryTracer's forwarding method. Agent transcript: https://claudescope.sentry.dev/share/L1InLC1w4Xm6HgEp2bHk-sJ2wtr9fRfQ08BpwGE4JSs

Remove unused profilerReferenceID parameter, add header docs, and fix stale TSan suppression. Agent transcript: https://claudescope.sentry.dev/share/YCbJaiw4eo47tyRGdPdNfyWa3VZueptJtPoevH1S97A

Agent transcript: https://claudescope.sentry.dev/share/F7n3parCPAfcG8axuTkl_e5rqRhTpI6T0S_tdcKY0CA

Fix trailing closure ambiguity with DispatchWorkItem and remove non-existent profilerReferenceID parameter. Agent transcript: https://claudescope.sentry.dev/share/boilLz21_S-f8uu_dcXvext-dAi2MAY8xkbK2zEafW4

Add experimental option to send standalone app start transactions instead of attaching app start data to the first UIViewController transaction. Uses a strategy pattern via AppStartMeasurementHandler protocol. The standalone handler is currently a no-op placeholder; actual transaction logic will be added in a follow-up. Refs: #6883 Agent transcript: https://claudescope.sentry.dev/share/KZR39vRrsVDqgpm56ONILZFlu1u_gpBhAnK7QrpyOH0

Create a real tracer with app.start.cold/warm operation that reuses the existing tracer pipeline for span building, measurements, context, debug images, and profiling. - Add SentrySpanOperationAppStartCold/Warm constants - Relax getAppStartMeasurement to accept app start ops - Skip intermediate root span for standalone transactions - Enable option in iOS sample app for validation Refs: #6883 Agent transcript: https://claudescope.sentry.dev/share/UaCuhStnxjQCwKH46hOsPqgeHsckPh15A0Flqw8JOPc

Move the standalone app start detection from SentryBuildAppStartSpans to SentryTracer and pass it as a BOOL parameter. Use span operation constants instead of string literals. Agent transcript: https://claudescope.sentry.dev/share/QyuEyImC81GP83tCrqUbp939ejQ3-3y_0TcwnvcejsA

Deduplicate the app start operation check in SentryTracer into a single method reused in toTransaction and getAppStartMeasurement. Agent transcript: https://claudescope.sentry.dev/share/bffTUQ5TAcp6oTyLqR8SSSjLLG4pSUsZ8l7TB7qaq1s

Also verify the trace origin is auto.app_start to more precisely identify standalone app start transactions. Agent transcript: https://claudescope.sentry.dev/share/HhoCIcB8Nh0dEd16RtFdllS_ZIxK393KCEPaOUiPp5s

Add StandaloneAppStartTransactionHelper to centralize the logic for identifying standalone app start transactions next to the code that creates them. Agent transcript: https://claudescope.sentry.dev/share/th338Y1YxxM5471m3BNGV5Az6QKNTNQzAyhCyZ9MmuM

Agent transcript: https://claudescope.sentry.dev/share/xXkgR2dl97mE2PWt7NruvtllULuWG4AsRUqKNBWTwmY

Agent transcript: https://claudescope.sentry.dev/share/pdKSDSkCaothxFJDzOiGaAa5Xx0Y25-3FAXUPTQBrMk

Agent transcript: https://claudescope.sentry.dev/share/ybqp4mPXWwKgONVEqEjXEB2fOJpPadgxjoVveErVLJg

Avoids race conditions with global static by passing the measurement directly to the tracer. Agent transcript: https://claudescope.sentry.dev/share/5dFraoe7qfSofcTRtjfi59JzjPmHtWPyBK9YLzp61_g

Agent transcript: https://claudescope.sentry.dev/share/X8DACobiqDRtZfVbeaQw4zLHsDROh6I5nJeKDL5zUEs

The assertion checked "app.vitals.start.warm.value" which is a span data key only set in standalone mode. The ui.load transaction uses "app_start_warm" as its measurement key.

SentryAppStartMeasurementProvider is only available on UIKit platforms. Without the guard, macOS builds fail.

Use a named ObjC category (SwiftPrivate) with rawNameSource: to give a distinct selector, replacing the standalone C functions and eliminating SentryTransactionContextFactory.h.

…andalone-app-start-tracing

itaybre · 2026-05-15T15:15:35Z

Example App Start

Trace ID is linked to ui.load
Has attributes app.vitals.start.screen, app.vitals.start.type, app.vitals.start.warm.value and app.vitals.start.value

philprime

Approved so you can move on, but I did leave a couple of feedback points to consider as you believe fit

cursor

Cursor Bugbot has reviewed your changes and found 1 potential issue.

^{❌ Bugbot Autofix is OFF. To automatically fix reported issues with cloud agents, enable autofix in the Cursor dashboard.}

^{Reviewed by Cursor Bugbot for commit 0e5330b. Configure here.}

The standalone strategy now owns marking the measurement as read, co-locating the responsibility with the code that consumes it.

## DESCRIBE YOUR PR Document new experimental option for the Apple/Cocoa SDK and how to sample standalone app starts - **`experimental.enableStandaloneAppStartTracing`** (shipped in [9.14.0](getsentry/sentry-cocoa#7660)): When enabled, the SDK sends app start data as a dedicated `app.start` transaction instead of attaching it as spans to the first UIViewController transaction. ## IS YOUR CHANGE URGENT? Help us prioritize incoming PRs by letting us know when the change needs to go live. - [ ] Urgent deadline (GA date, etc.): - [ ] Other deadline: - [x] None: Not urgent, can wait up to 1 week+ ## SLA - Teamwork makes the dream work, so please add a reviewer to your PRs. - Please give the docs team up to 1 week to review your PR unless you've added an urgent due date to it. Thanks in advance for your help! ## PRE-MERGE CHECKLIST *Make sure you've checked the following before merging your changes:* - [ ] Checked Vercel preview for correctness, including links - [ ] PR was reviewed and approved by any necessary SMEs (subject matter experts) - [ ] PR was reviewed and approved by a member of the [Sentry docs team](https://github.com/orgs/getsentry/teams/docs) --------- Co-authored-by: Claude Opus 4.6 (1M context) <[email protected]>

philipphofmann added the ready-to-merge Use this label to trigger all PR workflows label Mar 10, 2026

philipphofmann commented Mar 10, 2026

View reviewed changes

philipphofmann mentioned this pull request Mar 10, 2026

feat: Send standalone app start transactions #6883

Closed

Base automatically changed from ref/extract-app-start-measurement-provider to main March 11, 2026 10:44

philipphofmann added 18 commits March 11, 2026 12:04

fix: Remove leftover profilerReferenceID in concurrency test

ec54453

Agent transcript: https://claudescope.sentry.dev/share/F7n3parCPAfcG8axuTkl_e5rqRhTpI6T0S_tdcKY0CA

ref: Use SentrySpan protocol in app start spans

81c03f0

Agent transcript: https://claudescope.sentry.dev/share/xXkgR2dl97mE2PWt7NruvtllULuWG4AsRUqKNBWTwmY

fix linter

51dc82b

test: Add standalone app start span building tests

d4918cb

Agent transcript: https://claudescope.sentry.dev/share/pdKSDSkCaothxFJDzOiGaAa5Xx0Y25-3FAXUPTQBrMk

feat: Guard standalone app start transaction on SDK enabled

db3ef7e

Agent transcript: https://claudescope.sentry.dev/share/ybqp4mPXWwKgONVEqEjXEB2fOJpPadgxjoVveErVLJg

test: Assert span names and operations in standalone test

89686ca

Agent transcript: https://claudescope.sentry.dev/share/X8DACobiqDRtZfVbeaQw4zLHsDROh6I5nJeKDL5zUEs

test: Improve standalone app start global measurement test

985fdd0

itaybre added 2 commits May 11, 2026 18:57

chore: move changelog entry to unreleased section

eae8893

fix(test): use correct measurement key in markAsRead test

764f45e

The assertion checked "app.vitals.start.warm.value" which is a span data key only set in standalone mode. The ui.load transaction uses "app_start_warm" as its measurement key.

cursor Bot reviewed May 11, 2026

View reviewed changes

Comment thread Sources/Swift/Integrations/AppStartTracking/AppStartReportingStrategy.swift Outdated

buenaflor reviewed May 12, 2026

View reviewed changes

Comment thread Sources/Swift/Integrations/AppStartTracking/AppStartReportingStrategy.swift

feat: implement app start trace ID and screen name handling

39f4d4c

sentry Bot reviewed May 12, 2026

View reviewed changes

Comment thread Sources/Sentry/SentryPerformanceTracker.m Outdated

cursor Bot reviewed May 12, 2026

View reviewed changes

Comment thread Sources/Sentry/SentryPerformanceTracker.m

itaybre added 4 commits May 12, 2026 17:18

fix: guard app start trace ID usage with SENTRY_HAS_UIKIT

90ffe5e

SentryAppStartMeasurementProvider is only available on UIKit platforms. Without the guard, macOS builds fail.

ref: replace C factory functions with named category

d731019

Use a named ObjC category (SwiftPrivate) with rawNameSource: to give a distinct selector, replacing the standalone C functions and eliminating SentryTransactionContextFactory.h.

Merge branch 'main' of github.com:getsentry/sentry-cocoa into feat/st…

f795775

…andalone-app-start-tracing

Fix changelog

1d50d19

itaybre reviewed May 15, 2026

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Comment thread Sources/Sentry/SentryBuildAppStartSpans.m

philprime assigned itaybre May 19, 2026

philprime approved these changes May 19, 2026

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itaybre added 3 commits May 20, 2026 00:58

Fix changelog conflict

0907f2d

Add debug logs

1b0e8bc

Added precondition checks

c3d31c1

sentry Bot reviewed May 20, 2026

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Comment thread Sources/Sentry/SentryAppStartMeasurementProvider.m Outdated

cursor Bot reviewed May 20, 2026

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Comment thread Sources/Sentry/SentryAppStartMeasurementProvider.m

cursor Bot reviewed May 20, 2026

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Comment thread Sources/Sentry/SentryAppStartMeasurementProvider.m

itaybre force-pushed the feat/standalone-app-start-tracing branch from 0e5330b to c3d31c1 Compare May 20, 2026 12:58

sentry Bot reviewed May 20, 2026

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Comment thread Sources/Swift/Integrations/AppStartTracking/SentryAppStartTracker.swift

ref: move markAsRead from SentryTracer to strategy

dffab76

The standalone strategy now owns marking the measurement as read, co-locating the responsibility with the code that consumes it.

itaybre enabled auto-merge (squash) May 20, 2026 14:07

itaybre merged commit 89aaba2 into main May 20, 2026
255 of 258 checks passed

itaybre deleted the feat/standalone-app-start-tracing branch May 20, 2026 14:53

itaybre restored the feat/standalone-app-start-tracing branch May 20, 2026 15:17

itaybre mentioned this pull request May 21, 2026

docs(apple): Add standalone app start tracing docs getsentry/sentry-docs#17852

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📜 Description

💡 Motivation and Context

💚 How did you test it?

Method

Results

Full span comparison (sorted by duration desc)

Sentry links

Method

Results

Full span comparison (sorted by duration desc)

Sentry links

📝 Checklist

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Semver Impact of This PR

New Features ✨

Internal Changes 🔧

Samples

Other

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Codecov Report

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Performance metrics 🚀

Baseline results on branch: main

Startup times

App size

Previous results on branch: feat/standalone-app-start-tracing

Startup times

App size

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sentry Bot commented Mar 10, 2026

Sentry Build Distribution

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Sentry Build Distribution

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📲 Install Builds

iOS

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Sentry Build Distribution

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itaybre commented May 15, 2026

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philipphofmann commented Mar 10, 2026 •

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