“Things always go wrong in production, but this doesn’t have to be a bad thing. It’s an opportunity to learn about your system and the real world with which it interacts. With the right production monitoring tools, you can build a set of feedback mechanisms that help you find out about issues as they happen and ship fixes quickly. Adopting production QA (Quality Assurance) practices can help you gain a richer understanding of the real issues your system faces and learn new ways to improve its quality.” Link