hhfdna opened a new issue, #3243:
URL: https://github.com/apache/incubator-shenyu/issues/3243
### Question
It's not graceful for backend service to config shenyu admin's address,
especially username and passsword.
for example:
```yaml
shenyu:
register:
registerType: http #zookeeper #etcd #nacos #consul
serverLists: http://localhost:9095 #22.11.15.59:2181
#http://localhost:9095 #localhost:2181 #http://localhost:2379 #localhost:8848
props:
username: admin
password: 123456
```
so i prefer use zookeeper as registertype. It looks fine for dubbo
invocation,but when dubbo service gets offline, in admin dashboard, the
selector and rule lists are still there, and so with zookeer path:
```bash
[zk: localhost:2181(CONNECTED) 113] ls /shenyu/register/metadata/dubbo/dubbo
[org.apache.shenyu.examples.dubbo.api.service.DubboMultiParamService.findByListId,
org.apache.shenyu.examples.dubbo.api.service.DubboTestService.findList,
org.apache.shenyu.examples.dubbo.api.service.DubboMultiParamService.batchSaveAndNameAndId,
org.apache.shenyu.examples.dubbo.api.service.DubboMultiParamService.batchSave,
org.apache.shenyu.examples.dubbo.api.service.DubboMultiParamService.findByIdsAndName,
org.apache.shenyu.examples.dubbo.api.service.DubboTestService.findById,
org.apache.shenyu.examples.dubbo.api.service.DubboMultiParamService.findByStringArray,
org.apache.shenyu.examples.dubbo.api.service.DubboMultiParamService.saveComplexBeanTestAndName,
org.apache.shenyu.examples.dubbo.api.service.DubboTestService.insert,
org.apache.shenyu.examples.dubbo.api.service.DubboMultiParamService.saveComplexBeanTest,
org.apache.shenyu.examples.dubbo.api.service.DubboTestService.findAll,
org.apache.shenyu.examples.dubbo.api.service.DubboMultiParamService.findByArrayIdsAndName]
```
It seems like this metadata should be removed when service instance is
offline. isnt it?
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