[BUG] OOM in ANRTracker

[mpurbo]

Bug Description

OOM when ANRTracker is trying to collect stack trace.

Exception java.lang.OutOfMemoryError:
at java.util.Arrays.copyOf (Arrays.java:3257)
at java.lang.AbstractStringBuilder.ensureCapacityInternal (AbstractStringBuilder.java:124)
at java.lang.AbstractStringBuilder.append (AbstractStringBuilder.java:448)
at java.lang.StringBuilder.append (StringBuilder.java:137)
at com.grafana.faro.ANRTracker.handleAnrDetected (ANRTracker.java:178)
at com.grafana.faro.ANRTracker.run (ANRTracker.java:113)

Reference: https://github.com/grafana/faro-flutter-sdk/blob/main/android/src/main/java/com/grafana/faro/ANRTracker.java#L178

Steps to Reproduce

Hard to reproduce. This problem is crashing our app (infrequently). I assume because on some low-end devices, the ANR happens, the memory is low, and the stack trace is too big (Reference: https://github.com/grafana/faro-flutter-sdk/blob/main/android/src/main/java/com/grafana/faro/ANRTracker.java#L173)

Expected Behavior

The number of stack traces sent (built into the String) is limited (or configurable).

Actual Behavior

All stack traces in the main thread are dumped.

Environment

• Flutter version: 3.16.0
• Dart version: 3.2.0
• Faro Flutter SDK version: 0.3.4
• Platform: Android
• Device: Infinix Infinix-X657B, Redmi dandelion
• OS Version: Android 10, Android 11

Code Sample

No special code.

Additional Context

Checklist

• I have searched existing issues to ensure this is not a duplicate
• I have provided all the requested information above
• I have tested with the latest version of the SDK

[robert-northmind]

Thanks for reporting this. And sorry for the late reply. We will try and investigate this