dilipbiswal commented on a change in pull request #25658: 
[SPARK-28935][SQL][DOCS] Document SQL metrics for Details for Query Plan
URL: https://github.com/apache/spark/pull/25658#discussion_r320334972
 
 

 ##########
 File path: docs/web-ui.md
 ##########
 @@ -363,6 +363,42 @@ number of written shuffle records, total data size, etc.
 Clicking the 'Details' link on the bottom displays the logical plans and the 
physical plan, which
 illustrate how Spark parses, analyzes, optimizes and performs the query.
 
+### SQL metrics
+
+The metrics of SQL operators show in the block of operators. The SQL metrics 
can be useful when
+we want to dive into the execution details of each operator, for example, how 
many rows are output
+after a Filter operator. The related metrics are different for each type of 
operator, for example
+Exchange has the metrics called "shuffle bytes writte total" which shows the 
number of bytes written
 
 Review comment:
   Nit: written ?

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