|NO.Z.00316|——————————|CloudNative|——|KuberNetes&运维.V36|——|监控.v13|PromQL处理_Label|

一、对label进行处理

### --- 2个label合并，赋值成一个新的label

~~~     # 函数：label_join
~~~     表达式：label_join(node_filesystem_files_free, "new_label","","instance","mountpoint")：把instance和mountpoint这2个label的值赋值给new-label的值
~~~     输出结果：new_label="k8s-master01/boot：可以根据自己定义的规则，生成一个新的label

二、label_replace：赋值成一个新的label

### --- 对label的value进行正则匹配，赋值给新的label

~~~     函数：label_replace
~~~     表达式：取值$1:label_replace(node_filesystem_files_free, "host","$1","instance","(.*)-(.*)")
~~~     输出结果：host="k8s 

### --- 函数：label_replace

~~~     表达式：取值$2:label_replace(node_filesystem_files_free, "host","$2","instance","(.*)-(.*)")
~~~     输出结果：host="master01"    host="node01"    host="node02"

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Walter Savage Landor:strove with none,for none was worth my strife.Nature I loved and, next to Nature, Art:I warm'd both hands before the fire of life.It sinks, and I am ready to depart

                                                                                                                                                   ——W.S.Landor

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