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Langfuse 4.31.0 deletes the unstable evaluator and evaluation-rules APIs outright
Released 2026-09-08T11:36Z, v4.31.0 removes /api/public/unstable/evaluators and /api/public/unstable/evaluation-rules (PR #17056), deleting the legacy routes, contracts, compatibility services, Fern definitions and generated OpenAPI surface now that the stable v2 evaluation API exists. Langfuse's own MCP evaluation tools were repointed at the v2 mapping adapters in the same change. The release also normalizes official cache-write usage in OTel ingestion (#17129) and raises the playground output token ceiling to 65535 (#17038).
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