How to Suppress Debug Logs in Dagster Deployments

Problem Description

Users may need to suppress debug logs in their production deployment when using Dagster loggers. This is particularly relevant when working with loggers created using get_dagster_logger() in a Dagster+ serverless environment.

Symptoms

• Debug logs continue to appear despite configuring python_log_level: INFO in deployment settings

• Logger configuration appears correct but doesn't affect Dagster logger output

Root Cause

The managed_python_loggers configuration only applies to standard Python loggers, not Dagster loggers created with get_dagster_logger().

Solution

Switch from using get_dagster_logger() to using Python's standard logging module.

Step-by-Step Resolution

1. Replace Dagster logger with standard Python logger in your code:

   import logging
   
   # Instead of: logger = get_dagster_logger("your_logger_name")
   logger = logging.getLogger("your_logger_name")
   logger.debug("This debug message will be suppressed")
   logger.info("This info message will show")

2. Add your logger name to the managed_python_loggers configuration in your deployment settings:

   python_logs:
     managed_python_loggers:
       - your_logger_name
     python_log_level: INFO

3. Verify that debug messages are now suppressed while INFO level messages continue to appear

Prevention

When setting up new loggers in your Dagster deployment, use standard Python logging from the start if you need granular log level control.

Related Documentation

• Python logging documentation: https://docs.python.org/3/library/logging.html