public override void Invoke(AWSCredentials creds, RegionEndpoint region, int maxItems)
        {
            AmazonCloudWatchLogsConfig config = new AmazonCloudWatchLogsConfig();

            config.RegionEndpoint = region;
            ConfigureClient(config);
            AmazonCloudWatchLogsClient client = new AmazonCloudWatchLogsClient(creds, config);

            DescribeMetricFiltersResponse resp = new DescribeMetricFiltersResponse();

            do
            {
                DescribeMetricFiltersRequest req = new DescribeMetricFiltersRequest
                {
                    NextToken = resp.NextToken
                    ,
                    Limit = maxItems
                };

                resp = client.DescribeMetricFilters(req);
                CheckError(resp.HttpStatusCode, "200");

                foreach (var obj in resp.MetricFilters)
                {
                    AddObject(obj);
                }
            }while (!string.IsNullOrEmpty(resp.NextToken));
        }