Try implementing request

[krrishdholakia]

Title

Implement Langfuse Data Masking via Dynamic Parameters

Relevant issues

N/A

Pre-Submission checklist

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• I have Added testing in the tests/litellm/ directory, Adding at least 1 test is a hard requirement - see details
• I have added a screenshot of my new test passing locally
• My PR passes all unit tests on make test-unit
• My PR's scope is as isolated as possible, it only solves 1 specific problem

Type

🆕 New Feature

Changes

This PR introduces support for passing a masking function to Langfuse, enabling users to redact sensitive information from inputs and outputs before they are sent to the Langfuse server.

Key changes include:

• langfuse_masking_function Parameter: Added a new langfuse_masking_function parameter to StandardCallbackDynamicParams and LangfuseLoggingConfig.
• Langfuse Client Integration: The LangFuseLogger now accepts this function and passes it directly to the Langfuse SDK's mask parameter during client initialization.
• Dynamic Logger Caching: The LangFuseHandler has been updated to correctly propagate the masking function through the dynamic logging parameter flow. A new caching mechanism uses id(function) for cache key generation, as functions are not JSON serializable, ensuring that different masking functions result in distinct cached loggers.
• Dedicated Tests: Comprehensive unit tests have been added to verify the correct detection, propagation, and caching behavior of the masking function.

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Project	Deployment	Preview	Comments	Updated (UTC)
litellm	Ready	Preview	Comment	Dec 10, 2025 4:34pm

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