Github user RaafatAkkad commented on a diff in the pull request:

    https://github.com/apache/spark/pull/10959#discussion_r51326047
  
    --- Diff: 
core/src/main/scala/org/apache/spark/deploy/master/MasterSource.scala ---
    @@ -42,6 +42,6 @@ private[spark] class MasterSource(val master: Master) 
extends Source {
     
       // Gauge for waiting application numbers in cluster
       metricRegistry.register(MetricRegistry.name("waitingApps"), new 
Gauge[Int] {
    -    override def getValue: Int = master.waitingApps.size
    +    override def getValue: Int = master.apps.filter(_.state == 
ApplicationState.WAITING).size
    --- End diff --
    
    @jerryshao In all my tests using multiple Spark versions, the "apps" and 
"waitingApps" metrics have been the same. Do you know if the "waitingApps" 
metric is intended to refer to something other than the number of apps that are 
currently in the waiting state?
    Thanks


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