SongYadong opened a new pull request #23869: [SPARK-26967][CORE] Put 
MetricsSystem instance names together for clearer management
URL: https://github.com/apache/spark/pull/23869
 
 
   ## What changes were proposed in this pull request?
   
   `MetricsSystem` instance creations have a scattered distribution in the 
project code. So do their names. It may cause some inconvenience for browsing 
and management. 
   This PR tries to put them together. In this way, we can have a uniform 
location for adding or removing them, and have a overall view of `MetircsSystem 
`instances in current project.
   It's also helpful for maintaining user documents by avoiding missing 
something.
   
   ## How was this patch tested?
   
   Existing unit tests.
   

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