普罗米修斯监控马哥亲自讲解

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 1个主机有4核，如何求出这个主机的平均cpu的值

第一求出改主机4核当前的空闲值 rate(node_cpu_user{mode=idel})[5m]

接下来对4核的空闲值求出平均，把4核的值加起来求平均，就是当前实例cpu使用的平均值

avg(rate(node_cpu_user{mode=idel})[5m])by(instance)