iOS Application crashes when iOS Agent used with Google Firebase

[Gaurav.Soni]

We have seen some application crashes reported when the AppDynamics iOS Agent is used with an application already using Google Firebase.  The related issues have to do with a possible race condition that occurs with overlapping method swizzling between our agent and Firebase during initialization. 

We know of a workaround for this, which is to disable FirebaseAppDelegateProxyEnabled in Firebase. See: https://firebase.google.com/docs/cloud-messaging/ios/client#method_swizzling_in.  

Another option is to disable the auto-instrumentation in the iOS Agent (as described in enableAutoInstrument). However, doing this in the iOS Agent would remove a lot of functionality, including auto instrumentation of network requests and system and UI events. You would still retain crash handling, custom metrics, and screenshots.