[GitHub] [spark] LucaCanali commented on issue #24090: [SPARK-27157][DOCS] Add Executor level metrics to monitoring docs

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LucaCanali commented on issue #24090: [SPARK-27157][DOCS] Add Executor level metrics to monitoring docs
URL: https://github.com/apache/spark/pull/24090#issuecomment-472950776
 
 
   This looks to me a useful addition to the monitoring documentation.
   An additional comment is that ProcessTree executor metrics are collected only under certain conditions. I was thinking that maybe this fact can be documented in this PR?
   As far as I can see the conditions are the logical AND of the folloving: /proc filesystem exists, spark.eventLog.logStageExecutorProcessTreeMetrics.enabled=true, spark.eventLog.logStageExecutorMetrics.enabled=true

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