add mysqld-exporter

prod-upgrade/prom/mysql-exporter.yaml

@@ -33,7 +33,7 @@ spec:
           - --no-collect.info_schema.innodb_cmpmem 
           - --no-collect.global_variables
         volumeMounts:
-        - name: config.my-cnf
+        - name: config-my-cnf
           mountPath: /etc/my.cnf
           subPath: my.cnf
           readOnly: true
@@ -45,7 +45,7 @@ spec:
             cpu: 0.1
             memory: 512Mi
       volumes:
-      - name: config.my-cnf
+      - name: config-my-cnf
         configMap:
           name: mysqld-exporter
           items: