Github user xuanyuanking commented on a diff in the pull request:
https://github.com/apache/spark/pull/22381#discussion_r216377526
--- Diff: core/src/main/scala/org/apache/spark/SparkContext.scala ---
@@ -560,6 +561,7 @@ class SparkContext(config: SparkConf) extends Logging {
setupAndStartListenerBus()
postEnvironmentUpdate()
+ _env.metricsSystem.registerSource(appStatusSource)
--- End diff --
Better to put this line to +574
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