etcdserver/server.go
func (s *EtcdServer) CutPeer(id types.ID) {
	tr, ok := s.r.transport.(*rafthttp.Transport)
	if ok {
		tr.CutPeer(id)
	}
}
func (s *EtcdServer) CutPeer(id types.ID) {
	tr, ok := s.r.transport.(*rafthttp.Transport)
	if ok {
		tr.CutPeer(id)
	}
}
// CutPeer drops messages to the specified peer.