1 根据服务、环境选择数据
xxx_total{application="$application", instance="$instance"}
2 同上，支持muti-val（多选）
xxx_total{application="$application", instance=~"$instance"}
3 按xxx_method分类汇总，P95耗时
histogram_quantile(0.95, sum(rate(xxx_bucket{application="$applica[......]
在/etc/keepalived/keepalived.conf中配置如下：
vrrp_script chk_http_port {
script "/usr/bin/bash -c '</dev/tcp/127.0.0.1/8888'"
interval 2
weight -5
fall 2
rise 1
}
[......]
https://www.oracle.com/database/technologies/faq-jdbc.html#02_03
https://blog.51cto.com/u_7295170/2467597[......]