Represents the retry duration scaling behavior employed by a subscriber in response to message processing failure.
[DataContract] public enum MessageSubscribingRetryDurationScale
Retry duration scaling follows a Fibonacci curve, such that each retry event occurs with a delay duration equal to the sum of the previous two delay durations.
Retry duration scaling follows a linear path, such that each retry event is equidistant in time from its neighboring retry events.
The retry duration scaling behavior is not specified.