Progressive Delivery Explained - Big Bang (Recreate), Blue-Green, Rolling Updates, Canaries
Keep an old environment available during a controlled blue-green cutover. Deployment technique, not SaaS migration. Old environment does not recover changes made in new tool; retain data reconciliation and rollback rehearsal.
About this selection
T16-L04: Watch the blue-green section at 4:34–9:46 for the principle of keeping the previous environment available during cutover. This 2020 deployment explanation is a conceptual companion, not SaaS migration instructions. Keeping the old environment does not recover new work; retain reconciliation and the rollback rehearsal.
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