Github user jerryshao commented on a diff in the pull request:
https://github.com/apache/spark/pull/21635#discussion_r203232034
--- Diff: docs/monitoring.md ---
@@ -435,6 +435,7 @@ set of sinks to which metrics are reported. The
following instances are currentl
* `executor`: A Spark executor.
* `driver`: The Spark driver process (the process in which your
SparkContext is created).
* `shuffleService`: The Spark shuffle service.
+* `applicationMaster`: The Spark application master on YARN.
--- End diff --
I think it would be better to clarify as "The Spark ApplicationMaster when
running on YARN."
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