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* api-change:``cloudformation``: We added 5 new stack refactoring APIs: CreateStackRefactor, ExecuteStackRefactor, ListStackRefactors, DescribeStackRefactor, ListStackRefactorActions.
* api-change:``connectcases``: This release adds the ability to conditionally require fields on a template. Check public documentation for more information.
* api-change:``cost-optimization-hub``: This release enables AWS Cost Optimization Hub to show cost optimization recommendations for Amazon Auto Scaling Groups, including those with single and mixed instance types.
* api-change:``s3``: Updated list of the valid AWS Region values for the LocationConstraint parameter for general purpose buckets.
* enhancement:Eventsteam: The SDK no longer validates payload size for eventstreams. This is to facilitate varying payload requirements across AWS services.