ctx = lkctx.Context()
	defer nsLock.Unlock(lkctx)

	// Freeze all incoming S3 API calls before running speedtest.
	globalNotificationSys.ServiceFreeze(ctx, true)

	// Unfreeze as soon as request context is canceled or when the function returns.
	go func() {
		<-ctx.Done()
		globalNotificationSys.ServiceFreeze(ctx, false)
	}()

	durationStr := r.Form.Get(peerRESTDuration)

	return MetricDescription{
		Namespace: s3MetricNamespace,
		Subsystem: requestsSubsystem,
		Name:      canceledTotal,
		Help:      "Total number of S3 requests that were canceled by the client",
		Type:      counterMetric,
	}
}

func getS3RejectedAuthRequestsTotalMD() MetricDescription {
	return MetricDescription{
		Namespace: s3MetricNamespace,

}

// getReplicationDiff returns un-replicated objects in a channel.
// If a non-nil channel is returned it must be consumed fully or
// the provided context must be canceled.
func getReplicationDiff(ctx context.Context, objAPI ObjectLayer, bucket string, opts madmin.ReplDiffOpts) (chan madmin.DiffInfo, error) {
	cfg, err := getReplicationConfig(ctx, bucket)
	if err != nil {

		Cause: errors.New("site replication resync is already in progress"),
		Code:  ErrSiteReplicationInvalidRequest,
	}
	errSRResyncCanceled = SRError{
		Cause: errors.New("site replication resync is already canceled"),
		Code:  ErrSiteReplicationInvalidRequest,
	}
	errSRNoResync = SRError{
		Cause: errors.New("no resync in progress"),
		Code:  ErrSiteReplicationInvalidRequest,
	}
	errSRResyncToSelf = SRError{