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Re:AWS CloudFormation now supports blue/green deployments fo... by phamilton on Wednesday May 20, 2020 @02:30AM (#23243894)
It looks like this uses a new, not yet documented, top level attribute in a template: Hook.

At least, I haven't found any documentation for it other than the template they say to copy in the linked user guide for this feature. Definitely not supported in CDK.

Re:AWS CloudFormation now supports blue/green deployments fo... by dkdk8283 on Wednesday May 20, 2020 @04:55AM (#23244747)
What’s CDK in this context?
Re:AWS CloudFormation now supports blue/green deployments fo... by mcbain on Wednesday May 20, 2020 @05:19AM (#23244851)
Re:AWS CloudFormation now supports blue/green deployments fo... by mmansoor78 on Wednesday May 20, 2020 @05:00AM (#23244766)
AWS Cloud Development Kit