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Design a blue-green deployment system for a web application running on 20 servers with sub-30-second cutover, instant rollback, and zero downtime.
## Problem
Design a blue-green deployment system for a web application running on 20 servers. The system must maintain two identical production environments, switch traffic between them via a load balancer, and support instant rollback by reverting the switch. Your design should ensure zero downtime during deployments.
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