return s.pushDeltaXds(con, dwr, request)
	}
	return nil
}

// shouldRespondDelta determines whether this request needs to be responded back. It applies the ack/nack rules as per xds protocol
// using WatchedResource for previous state and discovery request for the current state.
func (s *DiscoveryServer) shouldRespondDelta(con *Connection, request *discovery.DeltaDiscoveryRequest) bool {