Bug#31084706 AVG_COUNT_RESET FOR MONITOR SET OWNER IS ALWAYS NULL IN

              I_S.INNODB_METRICS

Issue:
 While setting the monitor value METRIC_AVG_VALUE_RESET, the field is
 to be marked as notnull which was missed.

Fix:
 Set the monitor filed to be notnull once we have set its value.

Patch is contributed by Fungo Wang.

RB : 24280
Reviewed by : Sunny Bains <[email protected]>

Author: mayprasa

storage/innobase/handler/i_s.cc

@@ -1905,7 +1905,7 @@ static int i_s_metrics_fill(
       time_diff = 0;
     }
 
-    /* Unless MONITOR__NO_AVERAGE is marked, we will need
+    /* Unless MONITOR_NO_AVERAGE is marked, we will need
     to calculate the average value. If this is a monitor set
     owner marked by MONITOR_SET_OWNER, divide
     the value by another counter (number of calls) designated
@@ -1933,6 +1933,7 @@ static int i_s_metrics_fill(
             MONITOR_VALUE(count) /
                 MONITOR_VALUE(monitor_info->monitor_related_id),
             FALSE));
+        fields[METRIC_AVG_VALUE_RESET]->set_notnull();
       } else {
         fields[METRIC_AVG_VALUE_RESET]->set_null();
       }