feat: ios native anr capture

[bitsandfoxes]

What does it do

This PR allows Unity users to set enableAppHangTracking through the SentryUnityOptions via IosNativeAnrEnabled.

Why does it do it

On iOS, the Unity player loop runs on the main thread (the one with the CFRunLoop). The generated UnityAppController.mm registers Unity's frame tick as a CADisplayLink callback on the main run loop. Every Update, FixedUpdate, and LateUpdate execute on that single thread. Native UIKit/AppKit events share the same queue.
So when a Unity script blocks (e.g. infinite loop in Update, synchronous I/O, deadlock on .Wait()), it blocks the iOS main run loop directly. sentry-cocoa's watchdog enqueues a block on the main queue and times its execution. That means if Unity is stuck, that block never runs, and that hang is reported.

This is effectively replacing the Unity SDK C# ANR integration. The generated native ANR event contains an actual stack trace, making the report actually actionable.

How does it do it

We add a new flag IosNativeAnrEnabled that mirrors the AndroidNativeAnrEnabled. But unlike on Android, this replaces the C# watchdog entirely. We will need to follow up on this for Android as well. But the idea is to deprecate the `Anr

The resulting native event contains a fully symbolicated stack trace of the C# code that caused the freeze.

Follow up

We'll need to work on the in-app frames to clean up the stack trace presentation.

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## Unreleased

### Features

- ios native anr capture ([#2679](https://github.com/getsentry/sentry-unity/pull/2679))

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macOS gets duplicate ANR detection from iOS-specific flag

Medium Severity

SentryCocoaBridgeProxy.Init() is shared between iOS and macOS, and now unconditionally sets enableAppHangTracking based on IosNativeAnrEnabled (which defaults to true). On macOS, this enables native app-hang tracking, but unlike the iOS branch, DisableAnrIntegration() is never called — so both the native sentry-cocoa watchdog and the C# AnrIntegration run simultaneously, likely producing duplicate ANR reports on macOS.

Additional Locations (1)

• src/Sentry.Unity.iOS/SentryNativeCocoa.cs#L46-L51

 

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