The migration from Strapi 4 to Strapi 5 introduces a new approach called document service middleware, which offers more flexibility and power than traditional lifecycle hooks. Document service middleware allows for global actions that can be applied across multiple content types and actions, making it easier to manage complex features like draft-and-publish and localized content. The middleware functions are stored in their own files, keeping the code modular and reusable. The example project demonstrates how to use document service middleware to process documents, including formatting titles, handling UTM parameters, validating URLs, constructing full URLs, sending email notifications, and logging changes. This approach ensures that logging and notifications remain consistent throughout the application while simplifying middleware logic.