Major Description
Currently, we expose two monitoring urls in the AM. One is the tracking url, where the AM dashboard stays; the other one is a RPC url, which is for REST API. But we only documented the AM dashboard under Yarn/Application Master
Suggestion:
1. create a separate monitoring page for the Web UI and REST API under Jobs category.
2. move the dashboard section from Yarn Application Master to the monitoring page.
3. add REST API document. The format can be similar to what Spark uses. What we expose through the server is in ApplicationMasterRestServlet .