Phased migration automation replaces the high-risk 'big bang' cutover with a controlled, data-driven transition. The workflow orchestrates dark launches of new services, routes a small percentage of live traffic for canary analysis, and automatically switches traffic based on performance, error rate, and business logic validation. This de-risks the migration by enabling immediate rollback at a service or user-segment level, providing operational control and preserving system stability. The architecture integrates with API gateways, service meshes, and observability platforms to make routing decisions.




