n.LastHour = n.LastHour.merge(o.LastHour)
	n.ErrCounts = make(map[string]int)
	for k, v := range rt.ErrCounts {
		n.ErrCounts[k] = v
	}
	for k, v := range o.ErrCounts {
		n.ErrCounts[k] += v
	}
	return n
}

// SRStats has replication stats at site level
type SRStats struct {
	// Total Replica size in bytes
	ReplicaSize int64 `json:"replicaSize"`
	// Total Replica received