def level=(new_level)
      level_int = LEVEL_NAMES.key?(new_level) ? new_level : LEVELS[new_level]
      raise ArgumentError, "Log level must be one of :trace, :debug, :info, :warn, :error, or :fatal" if level_int.nil?
      loggers.each { |l| l.level = level_int }
    end
def level=(new_level)
      level_int = LEVEL_NAMES.key?(new_level) ? new_level : LEVELS[new_level]
      raise ArgumentError, "Log level must be one of :trace, :debug, :info, :warn, :error, or :fatal" if level_int.nil?
      loggers.each { |l| l.level = level_int }
    end
Sets the level for the Logger object by symbol.  Valid arguments are:

  :trace
  :debug
  :info
  :warn
  :error
  :fatal

 Throws an ArgumentError if you feed it a bogus log level.