Github user bzz commented on the issue:
https://github.com/apache/zeppelin/pull/836
@khalidhuseynov Just FYI, this PR adds 4 new messages websocket protocol:
```
APP_APPEND_OUTPUT, // [s-c] append output
APP_UPDATE_OUTPUT, // [s-c] update (replace) output
APP_LOAD, // [s-c] on app load
APP_STATUS_CHANGE, // [s-c] on app status change
```
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