[I] [BUG] <`this.doRefreshConfig()` method is not executed after restarting the plugin.> [shenyu]

["YxYL6125 (via GitHub)" <gi...@apache.org>]

YxYL6125 opened a new issue, #5292:
URL: https://github.com/apache/shenyu/issues/5292

   ### Is there an existing issue for this?
   
   - [X] I have searched the existing issues
   
   ### Current Behavior
   
   _No response_
   
   ### Expected Behavior
   
   _No response_
   
   ### Steps To Reproduce
   
   When I open the plugin for the first time, there is no deposit inside `Singleton.INST`, so the following code can be executed:
   
   ```java
   this.doRefreshConfig(globalLogConfig);
   logCollector().start();
   ```
   
   ![image-20231112144406521](https://raw.githubusercontent.com/YxYL6125/imgBad/main/img/image-20231112144406521.png)
   
   ![image-20231112144440081](https://raw.githubusercontent.com/YxYL6125/imgBad/main/img/image-20231112144440081.png)
   
   And it is also possible to execute ``this.close0();`` the first time I close it.
   
   ![image-20231112144522677](https://raw.githubusercontent.com/YxYL6125/imgBad/main/img/image-20231112144522677.png)
   
   But when I start the plugin again, the `doRefreshConfig()` method will not be executed since it was saved to `Singleton.INST` the previous time.
   
   ![image-20231112144625084](https://raw.githubusercontent.com/YxYL6125/imgBad/main/img/image-20231112144625084.png)
   
   Also, when closing the plugin, since `isStarted` is not set to `true`, it will not be executed either. This ultimately causes the plugin to fail on subsequent startups and shutdowns.
   
   ![image-20231112144643719](https://raw.githubusercontent.com/YxYL6125/imgBad/main/img/image-20231112144643719.png)
   
   
   
   ### Environment
   
   ```markdown
   ShenYu version(s):2.6.0
   ```
   
   
   ### Debug logs
   
   _No response_
   
   ### Anything else?
   
   My thinking was to `remove` the value inside the `Singleton.INST` when `closing` the plugin. The `doRefreshConfig` method is then executed when the plugin is restarted. 


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