feat: API regeneration: release-2026-03-18.08-02-55

[amanda-tarafa]

Changes in this PR will be published to Nuget on the next release cycle.

[gemini-code-assist]

Summary of Changes

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This pull request represents a routine API regeneration across several Google Cloud services. The changes primarily involve updating API discovery documents to reflect the latest API definitions, introducing new methods and data schemas, refining existing property descriptions, and expanding supported configurations like machine types and regional endpoints. The corresponding C# client libraries have been updated to align with these upstream API changes, ensuring compatibility and access to the newest features.

Highlights

• API Version Revisions: Multiple API discovery documents across various services (AlertCenter, Android Management, API Hub, App Engine, FirebaseML, Language, Merchant API) have had their revision numbers updated, indicating general API updates.
• New API Methods and Schemas: New functionality has been introduced, including a patch method for ApiHubInstances in API Hub, exportAppImage methods in App Engine (v1 and v1beta), and createTestAccount methods in Merchant API (v1 and v1beta). Corresponding new schemas like ClientSideEncryptionServiceUnavailable, IdentityProviderError, KeyServiceError (AlertCenter), GoogleCloudApihubV1AgentRegistrySyncConfig, and ExportAppImageRequest have been added.
• Android Management Policy Updates: Descriptions for screenCaptureDisabled properties in Android Management policies have been enhanced to explicitly mention blocking 'Circle to Search'.
• API Hub Schema Refinements: The API Hub schemas have been refined, including the removal of readOnly attributes from some ApiView properties, the addition of agentRegistrySyncConfig to Config, and marking several properties in flattened views as 'Optional.'.
• Language API Machine Type Expansion: The Language API has expanded its ComputeEngineMachineType enum to include new machine types such as C3D, N4_STANDARD_2, N4_HIGHCPU_2, N4_HIGHMEM_2, and a range of C3D_STANDARD, C3D_HIGHCPU, and C3D_HIGHMEM configurations.
• Observability API Regional Endpoints: New regional endpoints for 'us' and 'eu' have been added to the Observability API configuration.
• Client Library Version Bumps: All affected C# client libraries have received version updates, and the AlertCenter library's copyright year has been updated to 2026, along with its core Google.Apis package dependencies.

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[gemini-code-assist]

Code Review

This pull request is an API regeneration, introducing new features and endpoints across several services like Alert Center, API Hub, and App Engine. The changes are mostly additions and documentation updates in the API discovery documents and the corresponding generated C# client libraries. I've found a minor documentation issue in the Natural Language API definitions where new enum values are added without corresponding descriptions, which I've commented on.

[gemini-code-assist]

The enumDescriptions for the newly added machine_type values are all empty strings. To improve the API's usability and self-documentation, please provide meaningful descriptions for each of the new machine types. This feedback also applies to the corresponding changes in language.v1beta2.json and language.v2.json.