Offline-Snapshot process does not wait until EC2 instance is in standby

[mbloch1986]

At the beginning of the oflfine-snapshot process EC2 instances of the Author-Dispatcher & Publish-Dispatcher are getting moved into standby. As configured in the Classic Load Balancer Draining Policy or in the ALB Target Group deregistration_delay configuration, it can take up to 5 minutes until those EC2 instances are in standby.

The offline-snapshot process will fail in the scenario where it takes up to 5 minutes to move the EC2 instances into standby and the offline-snapshot process finishes within 5 minutes. Because the process tries to move the ec2 instances from standby into in service at the end, while those ec2 instances are not in standby yet.

Lambda Error message

ClientError: An error occurred (ValidationError) when calling the ExitStandby operation: The instance i-... is not in Standby.