if len(c.Rules) == 0 {
		return errReplicationNoRule
	}

	// Validate all the rules in the replication config
	targetMap := make(map[string]struct{})
	priorityMap := make(map[string]struct{})
	var legacyArn bool
	for _, r := range c.Rules {
		if _, ok := targetMap[r.Destination.Bucket]; !ok {
			targetMap[r.Destination.Bucket] = struct{}{}
		}
		if err := r.Validate(bucket, sameTarget); err != nil {
			return err
		}

}

// Stat - returns lambda webhook target statistics such as
// current calls in progress, successfully completed functions
// failed functions.
func (target *WebhookTarget) Stat() event.TargetStat {
	return event.TargetStat{
		ID:             target.id,
		ActiveRequests: atomic.LoadInt64(&target.activeRequests),
		TotalRequests:  atomic.LoadInt64(&target.totalRequests),

// GetARNList - returns available ARNs.
func (evnot *EventNotifier) GetARNList() []string {
	arns := []string{}
	if evnot == nil {
		return arns
	}
	region := globalSite.Region()
	for targetID := range evnot.targetList.TargetMap() {
		// httpclient target is part of ListenNotification
		// which doesn't need to be listed as part of the ARN list
		// This list is only meant for external targets, filter
		// this out pro-actively.