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You need to deploy a new application version to production. Because the deployment is high-risk, you need to roll the new version out to users over a number of hours to make sure everything is working correctly. You need to control the proportion of users seeing the new version of the application down to the percentage point. You use ELB and EC2 with Auto Scaling Groups and custom AMIs with your code pre-installed assigned to Launch Configurations. There are no database-level changes during your deployment. You also need to switch back to the original version of the code quickly if something goes wrong. What is the best way to meet these requirements?