The Incident That Changed How I Think About Production Readiness
There was a time when I believed a system was ready for production once it passed testing. The logic seemed reasonable. If the application behaved correctly under expected workloads, handled edge cases, and completed validation successfully, what else could go wrong? Production answered that question quickly. Everything Looked Ready Before deployment: testing was completed performance metrics looked healthy monitoring was configured the rollout plan was approved Nothing suggested the system was at risk. In fact, confidence was unusually high. The deployment itself went smoothly. The problems appeared later. The First Warning Was Small The earliest signal was not an outage. It was a minor delay that seemed insignificant at first. A few requests took longer than expected. Some data updates arrived later than usual. No alerts fired. Nothing appeared broken. Because each symptom looked small in isolation, nobody treated it as a serious concern. Small Problems St...