feng-tao edited a comment on issue #5139: [AIRFLOW-4360][WIP] Add performance 
metrics for Webserver UI.
URL: https://github.com/apache/airflow/pull/5139#issuecomment-485144871
 
 
   @mik-laj , yeah, but not sure what is the usage for the UI loadtime metric.  
But it will be confusing to tell the```airflow.webserver.graph.load_time``` 
stat from client side if they encounter page load time performance issue. Most 
of the page load time is spent on JS side, not on Flask side. I think most of 
the server side metrics are good to have. But it will be inaccurate to show 
tree/graph.page_load by measuring the time on Flask side only.
   
   my 2 $

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