grpc-proxy has resolver-ttl broken since 3.4.28 about etcd HOT 6 CLOSED

diff --git a/proxy/grpcproxy/cluster.go b/proxy/grpcproxy/cluster.go
index 338827d46..cd25e1867 100644
--- a/proxy/grpcproxy/cluster.go
+++ b/proxy/grpcproxy/cluster.go
@@ -105,9 +105,9 @@ func (cp *clusterProxy) monitor(wc endpoints.WatchChannel) {
                        for _, up := range updates {
                                switch up.Op {
                                case endpoints.Add:
-                                       cp.umap[up.Endpoint.Addr] = up.Endpoint
+                                       cp.umap[up.Key] = up.Endpoint
                                case endpoints.Delete:
-                                       delete(cp.umap, up.Endpoint.Addr)
+                                       delete(cp.umap, up.Key)
                                }
                        }
                        cp.umu.Unlock()
@@ -162,12 +162,12 @@ func (cp *clusterProxy) membersFromUpdates() ([]*pb.Member, error) {
        cp.umu.RLock()
        defer cp.umu.RUnlock()
        mbs := make([]*pb.Member, 0, len(cp.umap))
-       for addr, upt := range cp.umap {
+       for _, upt := range cp.umap {
                m, err := decodeMeta(fmt.Sprint(upt.Metadata))
                if err != nil {
                        return nil, err
                }
-               mbs = append(mbs, &pb.Member{Name: m.Name, ClientURLs: []string{addr}})
+               mbs = append(mbs, &pb.Member{Name: m.Name, ClientURLs: []string{upt.Addr}})
        }
        return mbs, nil
 }