uranusjr commented on code in PR #30485:
URL: https://github.com/apache/airflow/pull/30485#discussion_r1166043127


##########
airflow/cli/commands/celery_command.py:
##########
@@ -96,6 +100,27 @@ def _serve_logs(skip_serve_logs: bool = False):
         sub_proc.terminate()
 
 
+@after_setup_logger.connect()
+def logger_setup_handler(logger, **kwargs):
+    # Setup levels at which logs go to stderr and stdout if required
+    if conf.get("logging", "celery_logging_split", fallback=None):
+        celery_formatter = logging.Formatter(DEFAULT_TASK_LOG_FMT)
+
+        class NoErrorOrAboveFilter(logging.Filter):
+            def filter(self, record):
+                return record.levelno <= logging.WARNING
+
+        below_error_handler = logging.StreamHandler(sys.stdout)
+        below_error_handler.addFilter(NoErrorOrAboveFilter())

Review Comment:
   I flipped the wording to a positive tone (I think it avoids some mental 
overhead), and also switch to `< logging.ERROR` instead. Using `<= 
logging.WARNING` is problematic; it is possible to emit a log with an 
in-between level, e.g. `log(35, "...")` that would be missed.



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