GrowthBook 2.8 introduces several highly requested features aimed at enhancing user experience and control, including Prerequisite Flags, Code References, Official Metrics, and a "No Access" role. The Prerequisite Flags feature allows complex relationships between feature flags, enabling functionalities based on parent-child flag dependencies. Code References enhance visibility by identifying where features are used within application codebases, simplifying maintenance and updates. Official Metrics offer a method to distinguish vetted metrics within organizations by utilizing version control systems like GitHub, ensuring reliable experimentation. The addition of the "No Access" role provides granular control over user permissions, allowing more tailored access management. Furthermore, Webhooks for SDK Connections allow users to receive notifications about changes in feature flags and experiments, facilitating efficient cache management. The release also includes a new integration guide for WordPress, metric lookback windows, options for percentile capping, and over 50 documentation and bug fixes.