EnricoMi opened a new pull request #27375: [WIP][SPARK-30664][Web UI] Add 
optional metrics to all stages page
URL: https://github.com/apache/spark/pull/27375
 
 
   ### What changes were proposed in this pull request?
   Adding more metrics to the all stages page, some of those available at the 
individual stages pages, namely `Peak Execution Memory`, `Spill (Memory)`, 
`Spill (Disk)` and `GC Time`.
   
   ### Why are the changes needed?
   Finding stages that perform poorly is difficult when you have hundreds or 
thousands of stages. Sorting all stages by those extra metrics helps to 
identify those stages.
   
   ### Does this PR introduce any user-facing change?
   Yes, in the Web UI, not in the API.
   
   ### How was this patch tested?
   Manual tests.

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