feat(api): update API spec from langfuse/langfuse fa072d0

[langfuse-bot]

Important

Add expandMetadata parameter to ObservationsV2 API for retrieving full metadata values for specified keys.

• Behavior:
  • Add expandMetadata parameter to GetObservationsV2Request to allow retrieval of full metadata values for specified keys.
  • Update __getMany method in Client.ts to handle expandMetadata parameter, adding it to query parameters if provided.
• Documentation:
  • Update docstring in GetObservationsV2Request.ts to describe expandMetadata usage and provide examples.
  • Update comments in Client.ts to reflect metadata truncation behavior and expandMetadata usage.

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Disclaimer: Experimental PR review

Greptile Summary

Added expandMetadata parameter to the observations V2 API endpoint to allow retrieving non-truncated metadata values for specific keys.

• Added new optional expandMetadata string parameter accepting comma-separated list of metadata keys
• Updated API documentation to clarify that metadata values are truncated to 200 characters by default
• Properly integrated the parameter into query string handling with null-safe checks
• This is an auto-generated API spec update from the upstream langfuse/langfuse repository

Confidence Score: 5/5

• This PR is safe to merge with minimal risk
• Auto-generated API spec update that adds a backward-compatible optional parameter with proper null-safe handling and clear documentation. No breaking changes or logical errors detected.
• No files require special attention

Important Files Changed

Filename	Overview
packages/core/src/api/api/resources/observationsV2/client/requests/GetObservationsV2Request.ts	Added expandMetadata optional parameter with clear documentation for retrieving non-truncated metadata values
packages/core/src/api/api/resources/observationsV2/client/Client.ts	Integrated expandMetadata parameter into API client, updated docs, and added proper query parameter handling

Sequence Diagram

sequenceDiagram
    participant Client
    participant ObservationsV2
    participant API as /api/public/v2/observations
    
    Client->>ObservationsV2: getMany(request)
    Note over Client,ObservationsV2: request includes optional expandMetadata
    ObservationsV2->>ObservationsV2: Destructure request parameters
    Note over ObservationsV2: Extract expandMetadata from request
    ObservationsV2->>ObservationsV2: Build query params
    alt expandMetadata is provided
        ObservationsV2->>ObservationsV2: Add expandMetadata to _queryParams
    end
    ObservationsV2->>API: GET with query parameters
    Note over API: Returns observations with metadata<br/>- Truncated to 200 chars by default<br/>- Full values for keys in expandMetadata
    API-->>ObservationsV2: ObservationsV2Response
    ObservationsV2-->>Client: Return response

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Project	Deployment	Review	Updated (UTC)
langfuse-js	Ready	Preview	Jan 7, 2026 8:45am