The Problems with Annotation-based configuration

The text discusses the problems associated with annotation-based configuration in Kubernetes, specifically focusing on its use for managing routing logic and other complex configurations. It highlights that annotations can become unwieldy as they grow longer and more detailed, making it harder to manage upgrades, maintain, integrate with tools, and validate configs. CRDs (Custom Resource Definitions) are recommended as a cleaner approach to configuration, offering benefits such as easier management of complex routing logic, better visibility into resource status, and improved validation processes. The text also provides examples of when annotations might be appropriate, such as for operational metadata or cataloging information.