docs: def _get_all_tags(conn, load_balancer_names=None):
      '''
      Retrieve all the metadata tags associated with your ELB(s).
  
      :type load_balancer_names: list
      :param load_balancer_names: An optional list of load balancer names.
  
      :rtype: list
      :return: A list of :class:`boto.ec2.elb.tag.Tag` objects
      '''
      params = {}
      if load_balancer_names:
          conn.build_list_params(params, load_balancer_names,
                                 'LoadBalancerNames.member.%d')
  
      tags = conn.get_object(
          'DescribeTags',
          params,
          __utils__['boto_elb_tag.get_tag_descriptions'](),
          verb='POST'
      )
      if tags[load_balancer_names]:
          return tags[load_balancer_names]
      else:
          return None