anchor.diff:            Names = get_priv_dns_by_instance_ids(Values, Tag),
             autocluster_log:debug("Fetching autoscaling = DNS: ~p", [Names]),
             {ok, [autocluster_util:node_name(N) || N <- Names]};
  -        error -> error
  +        error -> {error, autoscaling_group_not_found}
         end;
       error ->
  -      error
  +      {error, describe_autoscaling_instances}
     end.
   
   
  
positive.code:     {error, Message, _} -> {error, Message}
    end.
  
  
  -spec build_instance_list_qargs(Instances :: list(), Accum :: list()) -> list().
  %% @private
  %% @doc Build the Query args for filtering instances by InstanceID.
  
negative.code:     {ok, Payload} ->
        Instances = flatten_autoscaling_datastructure(Payload),
        NextToken = get_next_token(Payload),
        get_all_autoscaling_instances(lists:append(Instances, Accum), NextToken);
      {error, Reason} = Error ->
        autocluster_log:error("Error fetching autoscaling group instance list: ~p", [Reason]),
        Error
    end.
  
  get_autoscaling_group_node_list(error, _) -> {error, instance_discovery};
  