AngersZhuuuu commented on pull request #33457:
URL: https://github.com/apache/spark/pull/33457#issuecomment-889333209


   > @AngersZhuuuu seriously, the description is badly written.
   > 
   > ```
   > When we use prometheus to fetch metrics, always pull data before 
application started.
   > 
   > Then throw a lot of exception not of NoSuchElementException
   > ```
   > 
   > Also, please mention that there will be a hint saying that "Spark is 
starting up" in section "Does this PR introduce any user-facing change?"
   
   How about current?


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