# File lib_ctrl/rucy/params.rb, line 535
      def logging_level=(new_level)
        case (new_level)
        when 'emerg', 'alert', 'crit', 'err', 'warning', 'notice', 'info', 'debug'
          # nothing to do.
        else
          raise "not allowed logging level: #{new_level.inspect}"
        end
        @attrs['logging_level'] = new_level
      end