Use live production traffic to gather performance metrics for new and existing applications and test under full production load before launch. Which approach should you use?

A/B testing with traffic mirroring allows you to duplicate live production traffic and send it to a new version of your application without impacting actual users. This enables comprehensive performance metric gathering under realistic production load before the new version is fully launched or exposed to users. Canary deployment gradually rolls out a new version to a small subset of users, which doesn't fully test under full production load initially. Blue/green deployment switches all traffic at once, which is high risk for testing. Rolling updates incrementally replace instances, also not allowing for full production load testing against a new version without user impact.