DOCSP-48277 Wasteful Replan serverStatus Metrics (#13138)

Author: kennethdyer

content/manual/upcoming/source/reference/command/serverStatus.txt

@@ -4452,12 +4452,14 @@ planCache
          hits : Long("<num>"), 
          misses : Long("<num>"),
          replanned : Long("<num>"),
+         replanned_plan_is_cached_plan : Long("<num>"),
          skipped : Long("<num>") 
       },
       sbe : { 
          hits : Long("<num>"), 
          misses: Long("<num>"),
          replanned : Long("<num>"),
+         replanned_plan_is_cached_plan : Long("<num>"),
          skipped : Long("<num>")  
       }
    }
@@ -4502,6 +4504,14 @@ planCache
 
    .. versionadded:: 8.0 *(Also available in 7.0.22)*
 
+.. serverstatus:: planCache.classic.replanned_plan_is_cached_plan
+
+   Number of times the server performed a replan operation for
+   the classic execution engine that produced a plan identical
+   to one already in the query cache.
+
+   .. versionadded:: 8.2
+
 .. serverstatus:: planCache.classic.skipped
 
    Number of classic execution engine query plans that were not found in the 
@@ -4521,11 +4531,19 @@ planCache
 
 .. serverstatus:: planCache.sbe.replanned
 
-   Number of |sbe-short| execution engine query plans that were
-   discarded and re-optimized.
+   Number of |sbe-short| query plans that were discarded and
+   re-optimized.
 
    .. versionadded:: 8.0 *(Also available in 7.0.22)*
 
+.. serverstatus:: planCache.sbe.replanned_plan_is_cached_plan
+   
+   Number of times the server performed a replan operation for
+   the |sbe-short| that produced a plan identical to one already
+   in the query cache.
+
+   .. versionadded:: 8.2
+
 .. serverstatus:: planCache.sbe.skipped
 
    Number of |sbe-short| query plans that were not found in the 
@@ -7922,4 +7940,4 @@ wiredTiger
 
       Amount of time, in milliseconds, to create the most recent
       checkpoint. An increase in this value under stead write load may
-      indicate saturation on the I/O subsystem.
+      indicate saturation on the I/O subsystem.

content/manual/upcoming/source/release-notes/8.2.txt

@@ -95,10 +95,13 @@ serverStatus Output Change
 
 :dbcommand:`serverStatus` includes the following new fields in its output:
 
-Operation Metrics
-`````````````````
 - :serverstatus:`metrics.operation.killedDueToRangeDeletion`
 
+- :serverstatus:`planCache.classic.replanned_plan_is_cached_plan`
+
+- :serverstatus:`planCache.sbe.replanned_plan_is_cached_plan`
+
+
 .. toctree::
    :titlesonly:
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