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

@@ -2618,7 +2618,7 @@ 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
@@ -2649,6 +2649,7 @@ i_s_metrics_fill(
 					/ MONITOR_VALUE(
 					monitor_info->monitor_related_id),
 					FALSE));
+				fields[METRIC_AVG_VALUE_RESET]->set_notnull();
 			} else {
 				fields[METRIC_AVG_VALUE_RESET]->set_null();
 			}