What Is a Blue-Green Load Balancer?
A blue-green load balancer fronts two identical deployments, the live blue one and the staged green one, and shifts traffic from one to the other in a single switch. Because both environments stay running, rollback is just flipping the target back. It is the routing mechanism that makes blue-green deployment possible.
Why it matters
The instant switch means users never see a half-deployed state, and a bad release can be reverted in seconds. CI/CD pipelines often promote the green target by reconfiguring this load balancer at the end of a deploy job.
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