Change AWS_LAMBDA_LOG_LEVEL behaviour

Author: Artem Krivonos

awslambdaric/bootstrap.py

@@ -369,7 +369,7 @@ def create_log_sink():
 
 
 AWS_LAMBDA_LOG_FORMAT = os.environ.get("AWS_LAMBDA_LOG_FORMAT", "TEXT")
-AWS_LAMBDA_LOG_LEVEL = os.environ.get("AWS_LAMBDA_LOG_LEVEL", "INFO")
+AWS_LAMBDA_LOG_LEVEL = os.environ.get("AWS_LAMBDA_LOG_LEVEL")
 _GLOBAL_AWS_REQUEST_ID = None
 
 
@@ -379,8 +379,6 @@ def setup_logging(log_format, log_level, log_sink):
     logger_handler = LambdaLoggerHandler(log_sink)
     if log_format == "JSON":
         logger_handler.setFormatter(JsonFormatter())
-        logging._levelToName[logging.CRITICAL] = "FATAL"
-        logger.setLevel(log_level)
     else:
         logger_handler.setFormatter(
             logging.Formatter(
@@ -389,6 +387,10 @@ def setup_logging(log_format, log_level, log_sink):
             )
         )
 
+    if log_level:
+        logging._levelToName[logging.CRITICAL] = "FATAL"
+        logger.setLevel(log_level)
+
     logger_handler.addFilter(LambdaLoggerFilter())
     logger.addHandler(logger_handler)