For the AWS::Chatbot::SlackChannelConfiguration resource, the GuardrailPolicies property was updated and the UserRoleRequired property was added.
Categories: Release Notes
Release Notes
StackSets managed execution
You can activate managed execution for your stack set so that StackSets performs non-conflicting operations concurrently and queues conflicting operations. After conflicting operations finish, StackSets starts queued operations in request order.