A rollback is the act of returning a system to a previous known-good version after a release causes problems. It restores service quickly while the team investigates the cause.
Blue-green deployment is a release technique that keeps two identical production environments and moves traffic from the old version to the new one in one step. The old side stays ready for instant rollback.
Data migration is moving data from one system, format or location to another while keeping it complete and correct. Typical cases are legacy database replacements and moves to the cloud.
Feature flags are switches in code that turn features on or off at runtime without a new deployment. Teams use them to release gradually, test with selected users and disable problems instantly.
Go-live is the moment a new system, product or major release is made available to real users in production. It is the culmination of planning, testing, cut-over and readiness checks.
Mean time to recovery (MTTR) is the average time it takes to restore a service after a failure or incident begins. It shows how quickly a team detects, responds to and fixes problems.
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