dyx27196280 opened a new issue, #5060:
URL: https://github.com/apache/servicecomb-java-chassis/issues/5060
### Steps to reproduce (if applicable)
问题1：
2.x中可以通过以下代码获取指定appid，serviceName的实例集合
````
MicroserviceVersionRule microService =
DiscoveryManager.INSTANCE.getAppManager().getOrCreateMicroserviceVersionRule(
appId, serviceName, SERVICE_VERSION_RULE);
Map<String, MicroserviceInstance> instanceMap = microService.getInstances();
````
3.x中api变化，应该怎么替换实现相同的功能
通过serviceCenterClient获取所有的微服务，然后再过滤，是否可行？或者有没有更好的平替方法？
```
ServiceCenterClient serviceCenterClient =
BeanUtils.getBean(ServiceCenterClient.class);
List<Microservice> microserviceList =
serviceCenterClient.getMicroserviceList().getServices();
```
问题2：2.x中PolicyRuleItem可以通过getMatch().match()判断某个请求头的值是否符合正则，3.x中要怎么替换适配？
问题3：2.x中MicroserviceCache.getInstance().getService()的替换方案
### What have you tried so far?
_No response_
### Additional context
_No response_
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