执行查看资源情况, 没有发现依赖资源未释放情况，排查依赖资源没有释放问题

kubectl get all -n test

3、猜测原因：k8s本身存在bug，查验源码和官方issue，分析delete namespace过程

查看ns状态，也没有异常情况

kubectl describe ns test

使用json查看ns详情

kubectl get ns test -o json

{
"lastTransitionTime": "2023-06-20T06:19:29Z",
"message": "Discovery failed for some groups, 1 failing: unable to retrieve the complete list of server APIs: metrics.k8s.io/v1beta1: the server is currently unable to handle the request",
"reason": "DiscoveryFailed",
"status": "True",
"type": "NamespaceDeletionDiscoveryFailure"
},

参考：kubernetes -- 删除namespace的过程以及遇到的bug解决_LanVv的博客-CSDN博客

二、治标不治本删除方法

了解完源码，还是没得到彻底解决方法

网上很多介绍使用api去解决 使用/api/v1/namespaces/${ns}/finalize 去删除namespace, 只能治标不治本，顺便贴上curl的解决方法

# 注意修改ip地址和生成k8s证书
for ns in `kubectl get ns  | grep Terminating | awk '{print $1}'`
do
    # 获取ns的json
    kubectl get namespace ${ns} -o json > /tmp/${ns}.json
    # 将spec内容清空, 剔除finalizers
    cat ${ns}.json | jq 'del(.spec.finalizers)' > /tmp/del_${ns}.json
    # 用api去删除ns
    curl --cert /tmp/client.pem --key /tmp/client-key.pem --cacert /tmp/ca.pem -H "Content-Type: application/json" -X PUT --data-binary @/tmp/del_${ns}.json https://master_IP:6443/api/v1/namespaces/${ns}/finalize
    # 删除残留文件
    rm -f /tmp/del_${ns}.json /tmp/${ns}.json
done

参考：k8s删除Terminating状态的命名空间_LanVv的博客-CSDN博客

三、kubeernetes组件日志分析

查看kube-apiserver 503

controller.go:116] loading OpenAPI spec for "v1beta1.metrics.k8s.io" failed with: failed to retrieve openAPI spec, http error: ResponseCode: 503, Body: service unavailable

v1beta1.metrics.k8s.io
http error: ResponseCode: 503, Body: service unavailable 简单明了

查看kube-controller-manager

namespace_controller.go:162] deletion of namespace test failed: unable to retrieve the complete list of server APIs: metrics.k8s.io/v1beta1: the server is currently unable to handle the request

也是metrics.k8s.io/v1beta1