feat(android): Set app start vitals on standalone app start children

[buenaflor]

📜 Description

Set app.vitals.start.type on the standalone app.start root, and copy app.vitals.start.screen + app.vitals.start.type onto all of its children — including user spans under app.start.extended. Headless starts omit screen. The ui.load-attached app start path is unchanged.

💡 Motivation and Context

Mobile vitals app start breakdown with app.start children with the root using these attributes. They were only on the root, so child spans did not group. Matches Flutter (getsentry/sentry-dart#3988).

Example of the sample app app start breakdown (previously empty without this PR):

Related to getsentry/sentry#122577

💚 How did you test it?

Unit tests in PerformanceAndroidEventProcessorTest (foreground, user descendants under app.start.extended, headless, ui.load non-propagation). Verified on sentry-samples-android (debug) that the envelope includes both attributes on the root, app.start.extended, and user children.

📝 Checklist

• I added GH Issue ID & Linear ID
• 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.
• Public API changes reviewed by another Mobile SDK team member or implemented according to the develop docs spec.

🔮 Next steps

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📲 Install Builds

Android

🔗 App Name	App ID	Version	Configuration
SDK Size	io.sentry.tests.size	8.53.0 (1)	release

⚙️ sentry-android Build Distribution Settings

[Copilot]

Pull request overview

This PR updates the Android app start transaction processing so standalone app.start transactions consistently expose app.vitals.start.type on the transaction root and propagate app.vitals.start.screen + app.vitals.start.type to all child spans (including user spans under app.start.extended), while keeping the ui.load-attached app start behavior unchanged.

Changes:

• Add app.vitals.start.type (APP_START_TYPE_DATA) and set it on standalone app start transaction roots.
• Propagate app.vitals.start.type and (when present) app.vitals.start.screen from the standalone app start root to all child spans.
• Add/extend unit tests covering foreground, headless, extended/user-span descendants, and non-propagation for ui.load-attached app start.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
sentry-android-core/src/main/java/io/sentry/android/core/PerformanceAndroidEventProcessor.java	Sets app.vitals.start.type on standalone app start roots and copies type/screen to child spans.
sentry-android-core/src/main/java/io/sentry/android/core/ActivityLifecycleIntegration.java	Introduces the APP_START_TYPE_DATA constant (app.vitals.start.type).
sentry-android-core/src/test/java/io/sentry/android/core/PerformanceAndroidEventProcessorTest.kt	Adds test coverage for propagation behavior across standalone app start scenarios.
sentry-android-core/build.gradle.kts	Adds Truth assertions dependency for new tests.
CHANGELOG.md	Adds an Unreleased feature entry describing the new standalone app start attribute propagation.

Suppressed comments (1)

sentry-android-core/build.gradle.kts:122

• libs.google.truth is declared twice in the test dependencies block, which is redundant and can cause confusion when scanning dependency lists. Keep a single declaration.

  testImplementation(libs.google.truth)
  testImplementation(libs.androidx.core.ktx)
  testImplementation(libs.androidx.test.core)
  testImplementation(libs.androidx.test.ext.junit)
  testImplementation(libs.androidx.test.runner)
  testImplementation(libs.awaitility.kotlin)
  testImplementation(libs.google.truth)

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