是否能有更详细的 Demo 示例例如：同机房区域优先，灰度测试，流量隔离等

[zhouyao1994]

• [x] I have searched the issues of this repository and believe that this is not a duplicate.
• [x] I have checked the REAMDE of this repository and believe that this is not a duplicate.

Is your feature request related to a problem? Please describe.

A clear and concise description of what the problem is. Ex. I'm always frustrated when [...] dubbo-admin 结合dubbo 应该能衍生出很多有意思，有趣，有用的玩法，例如：

• 灰度测试
• 流量隔离
• 同机房同区域优先

这些玩法在dubbo的官网链接中 有一些体现，但是似乎这些demo的体现又不太完整，希望能有更详细的的解释文档，也许我也可以在已有的基础上，参与并贡献一些示例的demo

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[AlbumenJ]

Nice！