[Feature] RocketMQ Prometheus exporter

[githublaohu]

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• I had searched in the issues and found no similar issues.

Feature Request

问题：用户已经使用 RocketMQ Prometheus exporter 作为采集，需要向“前”兼容

（1）RocketMQ Prometheus exporter 不同版本情况，非常重要
（2）可以下载 RocketMQ Prometheus exporter 修改 配置里面的 nameserivce 配置直接开启动就行了
（3）最好还是找薛老板，对下 有多少指标，个人感觉测试环境的指标相对比较少
（4）请按照 report 标准开发

Are you willing to submit PR?

• Yes I am willing to submit a PR!

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