Github user jerryshao commented on the issue:

    https://github.com/apache/spark/pull/18935
  
    @jsoltren @squito I take the liberty to get another shot of exposing Netty 
memory metrics. This PR doesn't address any display related things, only expose 
memory usage from Netty client factory and server. The following PRs could 
leverage this to display shuffle, RPC as well as other component's memory usage 
for Netty. This can be connected to `MetricsSystem`, also can be collected back 
to driver as you did before.
    
    Please help to review, your comments are greatly appreciated, thanks!



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