pmm监控postgresql数据库详细信息请参考：
Configuring PostgreSQL for Monitoring：
https://www.percona.com/doc/percona-monitoring-and-management/conf-postgres.html
pmm安装部署请参考：
https://blog.51cto.com/1937519/2319421
以下步骤为安装和配置pmm client需要在被监控的postgresql数据库服务上面操作：
1.安装pmm client：
rpm -ivh https://www.percona.com/redir/downloads/percona-release/redhat/latest/percona-release-0.1-6.noarch.rpm
yum install pmm-client -y
2.设置数据库，创建用户：
ALTER SYSTEM SET track_io_timing=ON;
SELECT pg_reload_conf();
CREATE USER pmm_user WITH SUPERUSER ENCRYPTED PASSWORD 'secret';
3.配置监控服务器
pmm-admin config –server 192.168.56.200 –server-user admin –server-password admin
或者：
pmm-admin config –server 192.168.56.200
4.添加操作系统监控：
pmm-admin add linux:metrics
5.添加postgresql数据库监控：
pmm-admin add postgresql –host=localhost –password='secret' –port=5432 –user=pmm_user
6.登录监控查看：
