This document discusses factors for building production-ready applications on Kubernetes. It describes the original 12 factors for building scalable apps and identifies 7 additional missing factors. The missing factors are: XIII) Observable, XIV) Schedulable, XV) Upgradable, XVI) Least Privileged, XVII) Auditable, XVIII) Access Control (Identity, Network, Scope, Certificates), and XIX) Measurable. Addressing all factors throughout the development and deployment process is key to building truly production-grade applications.