// loadAPIRequestsNetworkMetrics - loads S3 network metrics.
//
// This is a `MetricsLoaderFn`.
func loadAPIRequestsNetworkMetrics(ctx context.Context, m MetricValues, _ *metricsCache) error {
	connStats := globalConnStats.toServerConnStats()
	m.Set(apiTrafficSentBytes, float64(connStats.s3OutputBytes), "type", "s3")
	m.Set(apiTrafficRecvBytes, float64(connStats.s3InputBytes), "type", "s3")
	return nil
}

func (s *connStats) getS3OutputBytes() uint64 {
	return atomic.LoadUint64(&s.s3OutputBytes)
}

// Return connection stats (total input/output bytes and total s3 input/output bytes)
func (s *connStats) toServerConnStats() serverConnStats {
	return serverConnStats{
		internodeInputBytes:  s.getInternodeInputBytes(),  // Traffic internode received
		internodeOutputBytes: s.getInternodeOutputBytes(), // Traffic internode sent

	mg := &MetricsGroupV2{
		cacheInterval: 10 * time.Second,
	}
	mg.RegisterRead(func(ctx context.Context) (metrics []MetricV2) {
		metrics = make([]MetricV2, 0, 10)
		connStats := globalConnStats.toServerConnStats()
		rpcStats := rest.GetRPCStats()
		if globalIsDistErasure {
			metrics = append(metrics, MetricV2{
				Description: getInternodeFailedRequests(),
				Value:       float64(rpcStats.Errs),
			})