Observability task: common log analysis

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

## Describe the proposal

中文：
对于一些经典的错误日志（比如地址找不到、调用超时、服务端的线程资源耗尽、序列化失败等），我们需要整理出一份文档，做对应的案例分析，以便更好地帮助开发者排查问题。

在[Dubbo website](https://github.com/apache/dubbo-website)中完善日志相关文档。

en:
For some classic error logs, such as address not found, call timeout, thread resource exhaustion on the server, serialization failure, we need to sort out a document and make corresponding case studies to better help developers solve problems.

Improve log related documents on the [Dubbo website](https://github.com/apache/dubbo-website).
.

Start in the Dubbo website repository's existing log-related documentation and review the classic errors named in the issue: address-not-found, call timeout, server thread-resource exhaustion, and serialization failure. Done means the website contains organized case-study guidance for these logs that helps developers diagnose the corresponding problems.

Written by the indexing model from the issue text.