MLflow startup warning: PydanticDeprecatedSince20 still emitted from mlflow.gateway.config

[DCook-WGU]

Description

A single PydanticDeprecatedSince20 warning is still emitted at MLflow startup
(mlflow.gateway.config:454), even though warnings are globally filtered in
sitecustomize.py.

Repro

mlflow run . -P steps=download,basic_cleaning,data_check

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Observed once on startup.

Context

• MLflow version: 3.4.0
• Python: 3.13
• Pydantic: 2.12.x
• Environment: Conda / Docker / VS Code Dev Container

Notes

• Filters in sitecustomize.py and common/utils.py already handle
  UnsupportedFieldAttributeWarning and PydanticDeprecatedSince20.
• Only the gateway module still emits once before filters load.
• Possibly fixed in later MLflow versions once Pydantic v2 migration completes.

Action

• Revisit after upgrading MLflow to ≥ 3.5
• Remove suppression once no longer needed