MLflow 3.5.1 is a patch release that includes several bug fixes and improvements.

Features:

• [CLI] Add CLI command to list registered scorers by experiment (#18255, @alkispoly-db)
• [Deployments] Add configuration option for long-running deployments client requests (#18363, @BenWilson2)
• [Deployments] Create set_databricks_monitoring_sql_warehouse_id API (#18346, @dbrx-euirim)
• [Prompts] Show instructions for prompt optimization on prompt registry (#18375, @TomeHirata)

Bug fixes:

• [Evaluation] Validate if trace is None before accessing the value in mlflow.genai.evaluate (#18285, @srinathmkce)
• [Evaluation] Revert "Add atomicity to job_start API (#18226)" (@serena-ruan)
• [MCP] Move fastmcp to optional mcp extra (#18422, @harupy)
• [Model Registry] Fix serialization bug in file store (#18365, @BenWilson2)
• [Scoring] Pin uvloop to less than 0.22 to fix mlserver compatibility (#18370, @harupy)
• [Tracing] Fix a forward-compatibility issue with Span to_dict (#18439, @serena-ruan)
• [Tracing] Whitelist notebook trace UI renderer to allow display with default security settings (#18446, @TomeHirata)
• [Tracing] Fix attribute error in StrandsAgent tracing (#18409, @B-Step62)
• [Tracing] Adjust truncation logic in trace previews (#18412, @BenWilson2)
• [Tracing] Revert "Fix response handling in log_spans (#18280)" (#18349, @serena-ruan)
• [Tracking] Adjust util for remote tracking server declaration (#18411, @BenWilson2)
• [Tracking] Handle Databricks FMAPI style in openai autolog (#18354, @TomeHirata)
• [Tracking] Fetch config after adding first record (#18338, @serena-ruan)
• [UI] Fix span ID parsing in the UI (#18419, @daniellok-db)
• [UI] Fix Chat message parsing within the trace summary view modal (#18454, @daniellok-db)
• [UI] Fix an issue with display of the assessments pane in the UI (#18333, @BenWilson2)

Documentation updates:

• [Docs] Fix Kubernetes Deployment Tutorial Code (#18381, @Maeril)
• [Docs] Update the documentation around requirements for optimize_prompts (#18398, @TomeHirata)
• [Docs] Fix example FastAPI in track user sessions (#18388, @maxscheijen)

For a comprehensive list of changes, see the release change log, and check out the latest documentation on mlflow.org.