[GitHub] LucaCanali opened a new pull request #23798: [SPARK-26890][DOC] Add list of available Dropwizard metrics in Spark and add additional configuration details to the monitoring documentation

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LucaCanali opened a new pull request #23798: [SPARK-26890][DOC] Add list of available Dropwizard metrics in Spark and add additional configuration details to the monitoring documentation
URL: https://github.com/apache/spark/pull/23798
 
 
   ## What changes were proposed in this pull request?
   
   This PR proposes to extend the documentation of the Spark metrics system in the monitoring guide. In particular by:
   - adding a list of the available metrics grouped per component instance
   - adding information on configuration parameters that can be used to configure the metrics system in alternative to the metrics.properties file
   - adding information on the configuration parameters needed to enable certain metrics
   - it also propose to add an example of Graphite sink configuration in metrics.properties.template
   

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