See all these attributes which we're not setting yet.

https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-attribute-updatepolicy.html

At first glance, it seems sane to configure as follows:

• Rolling update, with SuspendProcesses=true.
• When deploying, don't overwrite manual changes to MinSize and MaxSize etc. that have been made after deployment.