The object observer interface used by instrumented objects to notify the observer of their existence.
attach — This method is called when the instrumented object is created or when the observer is attached to an existing object.
detach — This method is called when the instrumented object is destroyed and as a result the observer detached from the object.
failed — Notification of a failure.
This method is called when the instrumented object is created or when the observer is attached to an existing object.
This method is called when the instrumented object is destroyed and as a result the observer detached from the object.
Notification of a failure.
exceptionName
— The name of the exception.