Jian He created YARN-3273:

             Summary: Improve web UI to facilitate scheduling analysis and 
                 Key: YARN-3273
                 URL: https://issues.apache.org/jira/browse/YARN-3273
             Project: Hadoop YARN
          Issue Type: Improvement
            Reporter: Jian He

Job may be stuck for reasons such as:
- hitting queue capacity 
- hitting user-limit, 
- hitting AM-resource-percentage 

The  first queueCapacity is already shown on the UI.
We may surface things like:
- what is user's current usage and user-limit; 
- what is the AM resource usage and limit;
- what is the application's current HeadRoom;

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