ref(android): Measure ANR thresholds on the monotonic clock (JAVA-579)

[runningcode]

📜 Description

Moves the ANR integrations to use the MonotonicTicker abstraction. This also makes them more testable since we aren't hard coding a direct access to SystemClock.

A note: We previously used SystemClock.uptimeMillis which does not include time spent in sleep. The implementation of MonotonicTicker on Android uses SystemClock.elapsedRealtimeNanos(). Since we aren't using these to measure background ANRs, nothing changes.

Also ANRWatchdog was previously using a ICurrentDateProvider. Which has two different implementations, a wall clock and a monotonic clock. It happens to work by chance on Android because on Android it should always return a monotonic clock but this is quite brittle.

💡 Motivation and Context

Fixing clocks and making the code more sane.

• resolves: JAVA-579

💚 How did you test it?

./gradlew :sentry-android-core:testReleaseUnitTest :sentry-android-core:apiCheck — green.

📝 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.

[linear-code]

JAVA-579

[sentry]

📲 Install Builds

Android

🔗 App Name	App ID	Version	Configuration
SDK Size	io.sentry.tests.size	8.56.0 (1)	release

⚙️ sentry-android Build Distribution Settings

[runningcode]

This returns EITHER a monotonic clock or a wall clock depending on the platform. This is a bad abstraction.
On android it gives you a monotonic clock which is what we want for this class, but the fact that it has Date in the name but gives you a monotonic clock is quite confusing.

[cursor]

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

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[cursor]

ANR clock includes device sleep

Medium Severity

ANR thresholds now come from MonotonicTicker, which on Android is elapsedRealtimeNanos and keeps counting through suspend. ANRWatchDog still polls while backgrounded, so a device sleep can expire uiResponsiveUntil and look like a frozen main thread. The old uptimeMillis path did not include sleep.

Additional Locations (2)

• sentry-android-core/src/main/java/io/sentry/android/core/ANRWatchDog.java#L146-L147
• sentry-android-core/src/main/java/io/sentry/android/core/anr/AnrProfilingIntegration.java#L245-L247

 

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