Fix expression of graph `Current QPS` in MySQL dashboard. (#12414)

docs/en/changes/changes.md

@@ -28,6 +28,7 @@
 * BanyanDB client config: rise the default `maxBulkSize` to 10000, add `flushTimeout` and set default to 10s.
 * Polish BanyanDB group and schema creation logic to fix the schema creation failure issue in distributed race conditions.
 * Support tracing topology query for debugging.
+* Fix expression of graph `Current QPS` in MySQL dashboard.
 
 #### UI
 * Highlight search log keywords.

oap-server/server-starter/src/main/resources/ui-initialized-templates/mysql/mysql-instance.json

@@ -52,7 +52,7 @@
             }
           ],
           "expressions": [
-            "avg(meter_mysql_instance_qps)"
+            "meter_mysql_instance_qps"
           ]
         },
         {