ocp：4.2.2
这里没有值，需要把enable_extra_prometheus_metric设置为true。
修改enable_extra_prometheus_metric值：
貌似没有生效，查询数据库确实没有生效：
mysql> select * from proxy_config where name='enable_extra_prometheus_metric';
+------+------+-------+-------------+--------------+--------------------------------+-------+------+-------+-------------+---------------+--------------+
| vid | vip | vport | tenant_name | cluster_name | name | value | info | range | need_reboot | visible_level | config_level |
+------+------+-------+-------------+--------------+--------------------------------+-------+------+-------+-------------+---------------+--------------+
| -1 | | 0 | | | enable_extra_prometheus_metric | False | | | | | LEVEL_GLOBAL |
+------+------+-------+-------------+--------------+--------------------------------+-------+------+-------+-------------+---------------+--------------+
1 row in set (0.00 sec)
