var types madmin.MetricType = madmin.MetricsDisk | madmin.MetricNet | madmin.MetricsMem | madmin.MetricsCPU

	m := collectLocalMetrics(types, collectMetricsOpts{})
	for _, hm := range m.ByHost {
		if hm.Net != nil && len(hm.Net.NetStats.Name) > 0 {
			stats := hm.Net.NetStats
			labels := map[string]string{"interface": stats.Name}
			updateResourceMetrics(interfaceSubsystem, interfaceRxBytes, float64(stats.RxBytes), labels, true)

      return empty;
    }
    try {
      return fromEntryArrayCheckingBucketOverflow(n, entryArray, throwIfDuplicateKeys);
    } catch (BucketOverflowException e) {
      // probable hash flooding attack, fall back to j.u.HM based implementation and use its
      // implementation of hash flooding protection
      return JdkBackedImmutableMap.create(n, entryArray, throwIfDuplicateKeys);
    }
  }

	stringToSign := getStringToSignV2(req.Method, encodedResource, strings.Join(unescapedQueries, "&"), req.Header, expiresStr)
	hm := hmac.New(sha1.New, []byte(secretAccessKey))
	hm.Write([]byte(stringToSign))

	// Calculate signature.
	signature := base64.StdEncoding.EncodeToString(hm.Sum(nil))

	query := req.URL.Query()
	// Handle specially for Google Cloud Storage.
	query.Set("AWSAccessKeyId", accessKeyID)

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