The v1alpha discovery document has undergone a significant cleanup, effectively removing the entire NotebookLM resource surface, including methods for creating, getting, sharing, and batch deleting notebooks. Developers using these alpha endpoints will need to migrate or cease usage.
On the feature side, Discovery Engine introduces DataProtectionPolicy across DataStore, DataConnector, and AssistantCustomerPolicy. This allows for direct integration with Google Cloud Sensitive Data Protection (formerly DLP) to sanitize file uploads and connector sources. Additionally, a new SessionConfig has been added to the Engine resource, enabling developers to specify sessionManagementPolicy (e.g., VERTEX_AI_MANAGED for 1P/3P identity) and custom sessionTtl (defaulting to 60 days). Finally, widgetConfigs now support an END_USER_MOBILE view specifically for Gemini Enterprise mobile app integrations.
