text: Title: JVM Metrics tutorial does not work
  Body: **Page**
  [Metrics System @ JVM Metrics](https://docs.alluxio.io/os/user/edge/en/operation/Metrics-System.html#jvm-metrics).
  
  **Summary**
  The actions specified by the docs are difficult to understand, do not provide a clear step by step instruction plan, and ultimately do not work.
  