- [x] I have searched the 
[issues](https://github.com/apache/incubator-dubbo/issues) of this repository 
and believe that this is not a duplicate.
- [x] I have checked the 
[FAQ](https://github.com/apache/incubator-dubbo/blob/master/FAQ.md) of this 
repository and believe that this is not a duplicate.

### Environment

* Dubbo version: 2.6.5


### Confusion

the code below  create a ```connectionMonitor``` instance, but ```Start``` 
method seems not called
```
@Override
    protected <T> T doRefer(Class<T> serviceType, URL url) throws RpcException {
        if (connectionMonitor == null) {
            connectionMonitor = new ConnectionMonitor();
        }
      ...
    }
```


[ Full content available at: 
https://github.com/apache/incubator-dubbo/issues/3237 ]
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