--- features: - Add optional 'period' property for Monasca Notification resource. The new added property will now allow the user to tell Monasca the interval in seconds to periodically invoke a webhook until the ALARM state transitions back to an OK state or vice versa. This is useful when the user wants to create a stack which will automatically scale up or scale down more than once if the alarm state continues to be in the same state. To conform to the existing Heat autoscaling behaviour, we manually create the monasca notification resource in Heat with a default interval value of 60.