Describe what happened

I'm setting up DataDog in an Android project and seeing some unexpected custom events being reported. We are seeing two unknown custom events/actions being reported in our DataDog console. We are not calling GlobalRum.get().addUserAction(RumActionType.CUSTOM, event, attributes) with either "back" or "" as parameters:

1. "back": there is a custom event being reported with a name/description of "back" that is reported when the Android system back button is pressed.

2. "": we have also seen a custom event reported with no name/description.

Screenshot included below shows both in the DataDog console, filtered by actions with type custom:

Steps to reproduce the issue:

1. System back button is pressed, a custom action/event is reported with name "back"

2. Have not reproduced getting the empty name event, but less important to us as it's only ever occurred 2 times during testing.

Describe what you expected:

Expecting to only see custom events sent when GlobalRum.get().addUserAction(RumActionType.CUSTOM, event, attributes) is called. (Or expecting to see back button reported as a TAP action, maybe)

Additional context

• Android OS version: 10
• Device Model: Samsung SM-G975U1
• Datadog SDK version: 1.12.0
• Versions of any other relevant dependencies (OkHttp, …):
• Proguard configuration:
• Gradle Plugins: