LucaCanali commented on issue #24132: [SPARK-27189][CORE] Add Executor metrics and memory usage instrumentation to the metrics system URL: https://github.com/apache/spark/pull/24132#issuecomment-558318439 I think it should be OK to have ExecutorMetrics on by default. It is the case for most metrics at present. BTW, the JVM-related memory metrics in ExecutorMetrics can also be used as a partial (but in most cases good enough) replacement for the optional `org.apache.spark.metrics.source.JvmSource`.
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