pnowojski commented on a change in pull request #17660:
URL: https://github.com/apache/flink/pull/17660#discussion_r754096460



##########
File path: docs/content.zh/docs/ops/metrics.md
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@@ -916,12 +916,17 @@ Metrics related to data exchange between task executors 
using netty network comm
       <td>Gauge</td>
     </tr>
     <tr>
-      <th rowspan="18">Task</th>
-      <td rowspan="4">Shuffle.Netty.Input.Buffers</td>
+      <th rowspan="20">Task</th>
+      <td rowspan="5">Shuffle.Netty.Input.Buffers</td>
       <td>inputQueueLength</td>
       <td>The number of queued input buffers.</td>
       <td>Gauge</td>
     </tr>
+    <tr>
+      <td>inputQueueSize</td>
+      <td>The real size of queued input buffers in bytes. The size for local 
input channels is only estimated.</td>

Review comment:
       On a second thought. Shouldn't we actually ignore local input channels? 
   
   1. It would be kind of consistent with the other metrics
   2. Otherwise, don't we double account those bytes on the output and on the 
input?




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