RFC add server side data masking docs

[marcklingen]

Important

Adds documentation for server-side data masking in self-hosted Langfuse, including configuration and example implementation.

• Documentation:
  • Adds data-masking.mdx to document server-side data masking for self-hosted Langfuse, detailing client-side and server-side approaches.
  • Updates self-host-features.mdx to include "Data Masking" card linking to new documentation.
  • Updates license-key.mdx to list "Server-Side Data Masking" as an enterprise feature.
• Configuration:
  • Describes environment variables for server-side masking: LANGFUSE_INGESTION_MASKING_CALLBACK_URL, LANGFUSE_INGESTION_MASKING_CALLBACK_TIMEOUT_MS, and LANGFUSE_INGESTION_MASKING_CALLBACK_FAIL_CLOSED.
• Example:
  • Provides a Python FastAPI example for implementing a masking callback service.

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Project	Deployment	Actions	Updated (UTC)
langfuse-docs	Ready	Preview, Comment	Feb 5, 2026 1:05pm

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New Page Added

The following page was added to the bundle from the code in this PR:

Page	Size (compressed)	First Load	% of Budget (350 KB)
/self-hosting/security/data-masking	62.78 KB	468.22 KB	133.78%