The default behavior of Amazon autoscaling group is to keep the instances balanced among the availability zones in a certain region (http://docs.aws.amazon.com/autoscaling/latest/userguide/as-instance-termination.html#default-termination-policy).
A constraint should be implemented to ensure the same behavior as the default AWS behavior for autoscaling groups
The default behavior of Amazon autoscaling group is to keep the instances balanced among the availability zones in a certain region (http://docs.aws.amazon.com/autoscaling/latest/userguide/as-instance-termination.html#default-termination-policy).
A constraint should be implemented to ensure the same behavior as the default AWS behavior for autoscaling groups