通过cpu字段筛选
100 - (avg(irate(node_cpu_seconds_total{instance="192.168.64.137:9100",mode="idle",cpu="0"}[2s])) by (instance) *100)100 - (avg(irate(node_cpu_seconds_total{instance="192.168.64.137:9100",mode="idle",cpu="1"}[2s])) by (instance) *100)100 - (avg(irate(node_cpu_seconds_total{instance="192.168.64.137:9100",mode="idle",cpu="2"}[2s])) by (instance) *100)100 - (avg(irate(node_cpu_seconds_total{instance="192.168.64.137:9100",mode="idle",cpu="3"}[2s])) by (instance) *100) 
