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Cloned from launchpad blueprint https://blueprints.launchpad.net/heat/+spec/as-update-policy. Description: AWS provide an UpdatePolicy attribute which can be used with AutoScaling groups to specify how changes to the launch configuration or subnet are rolled out. Seems like a useful thing to add, somewhat related to the rolling-updates work but not specific to metadata. Specification URL (additional information): http://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-attribute-updatepolicy.html
Moving to POST based on upstream status (Implemented).