'kubectl get hpa'未显示外部指标显示“<unknown type>”

我们在GKE中设置了集群，并使用堆栈驱动器中的“外部指标”扩展我们的pod。缩放工作正常，但是当我尝试使用命令查看状态时

$ kubectl获取hpa

它在TARGET中显示“未知类型”而不是下面的实际值。

NAME REFERENCE TARGETS MINPODS MAXPODS REPLICAS AGE
accounts-service Deployment/accounts-service 1 200 1 15d
我目前的kubectl版本显示为

$ kubectl version
Client Version: version.Info{Major:"1", Minor:"8", GitVersion:"v1.8.6", GitCommit:"6260bb08c46c31eea6cb538b34a9ceb3e406689c", GitTreeState:"clean", BuildDate:"2017-12-21T06:34:11Z", GoVersion:"go1.8.3", Compiler:"gc", Platform:"darwin/amd64"}
Server Version: version.Info{Major:"1", Minor:"11+", GitVersion:"v1.11.5-gke.4", GitCommit:"0c81dc1e8c26fa2c47e50072dc7f98923cb2109c", GitTreeState:"clean", BuildDate:"2018-12-07T00:22:06Z", GoVersion:"go1.10.3b4", Compiler:"gc", Platform:"linux/amd64"}
有没有人遇到类似的问题？