The Sentry Flutter SDK version 9.0 introduces several features to improve visibility and debugging of errors in Flutter applications. Session Replay for mobile allows developers to see a video-like reconstruction of user interactions before a crash, while Logs (now in open beta) correlates logs with crashes and performance issues. Feature flag support enables understanding which flags were enabled when bugs happened, and Native JS error support provides better visibility into Flutter Web apps using JavaScript interop. Release Health support gives insights into release adoption, stability, and crash-free sessions for Flutter Web apps. Improved linking between traces and errors also correlates issues with specific spans in the application code. These features aim to provide more context and help developers identify and fix issues more efficiently.