A Production Readiness Review (PRR) is a structured checklist and review process that a service must pass before it is deployed to production traffic. It ensures that a new service or major feature release has met minimum standards across security, observability, reliability, capacity, and operational readiness. Without a PRR, teams discover missing runbooks, unmonitored error paths, and untested failure modes during production incidents rather than before launch.
Analogy🏏Cricket
🏏 Think of it like cricket: A batting coach who only reviews a batter's technique after a tournament has already ended. The batter has played 10 matches with a flawed grip — every run scored with bad technique is harder to unlearn than if the coach had corrected it in the first net session. Shifting security left is bringing the coach into the net sessions, not the post-tournament review.