[GitHub] [spark] wangyum commented on a change in pull request #24090: [SPARK-27157][DOCS] Add Executor level metrics to monitoring docs

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wangyum commented on a change in pull request #24090: [SPARK-27157][DOCS] Add Executor level metrics to monitoring docs
URL: https://github.com/apache/spark/pull/24090#discussion_r265472599
 
 

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 File path: docs/monitoring.md
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 @@ -609,7 +609,155 @@ A list of the available metrics, with a short description:
   </tr>
 </table>
 
+### Executor Metrics
 
+Executor-level metrics are sent from each executor to the driver as part of the Heartbeat to describe the performance metrics of Executor itself like JVM heap memory, GC infomation.
+A list of the available metrics, with a short description:
+
+<table class="table">
+  <tr><th>Executor Level Metric name</th>
+      <th>Short description</th>
+  </tr>
+    <tr>
+    <td>totalGCTime</td>
+    <td>Elapsed time the JVM spent in garbage collection summed in this Executor.
+    The value is expressed in milliseconds.</td>
+  </tr>
+  </tr>
 
 Review comment:
   two `</tr>`?

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