replace

初始环境：

scrape_configs:
  - job_name: 'avalon-inner'
    static_configs:
    - targets: ['10.172.188.212:8083']
      labels:
        project: devops
        app: jenkins/master

[root@k8s-node02 server]# curl http://192.168.200.147:9090/api/v1/targets?state=active | jq
{
  "status": "success",
  "data": {
    "activeTargets": [
      {
        "discoveredLabels": {
          "__address__": "10.172.188.212:8083",
          "__metrics_path__": "/metrics",
          "__scheme__": "http",
          "app": "jenkins/master",
          "job": "avalon-inner",  //定义标签
          "project": "devops"     //定义标签
        },
        "labels": {
          "app": "jenkins/master",
          "instance": "10.172.188.212:8083",
          "job": "avalon-inner",  //定义标签
          "project": "devops"     //定义标签
        },
        "scrapePool": "avalon-inner",
        "scrapeUrl": "http://10.172.188.212:8083/metrics",
        "globalUrl": "http://10.172.188.212:8083/metrics",
        "lastError": "",
        "lastScrape": "2021-03-18T17:57:44.732036509+08:00",
        "lastScrapeDuration": 0.026422222,
        "health": "up"
      }
    ],
    "droppedTargets": []
  }
}

将标签project的值 复制给 app

scrape_configs:
  # The job name is added as a label `job=<job_name>` to any timeseries scraped from this config.
  - job_name: 'avalon-inner'
    static_configs:
    - targets: ['10.172.188.212:8083']
    #- targets: ['192.168.200.147:8083','10.172.188.212:8083']
      labels:
        project: devops
        app: jenkins/master
    relabel_configs:
    - source_labels: [project]
      regex: (.+)
      target_label: project
      action: replace

[root@k8s-node02 server]# curl http://192.168.200.147:9090/api/v1/targets?state=active | jq
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100   557  100   557    0     0   330k      0 --:--:-- --:--:-- --:--:--  543k
{
  "status": "success",
  "data": {
    "activeTargets": [
      {
        "discoveredLabels": {
          "__address__": "10.172.188.212:8083",
          "__metrics_path__": "/metrics",
          "__scheme__": "http",
          "app": "jenkins/master",
          "job": "avalon-inner",   //定义标签(不变)
          "project": "devops"      //定义标签(不变)
        },
        "labels": {
          "app": "devops",   //app值 被修改
          "instance": "10.172.188.212:8083",
          "job": "avalon-inner",
          "project": "devops"  //定义标签 未操作
        },
        "scrapePool": "avalon-inner",
        "scrapeUrl": "http://10.172.188.212:8083/metrics",
        "globalUrl": "http://10.172.188.212:8083/metrics",
        "lastError": "",
        "lastScrape": "0001-01-01T00:00:00Z",
        "lastScrapeDuration": 0,
        "health": "unknown"
      }
    ],
    "droppedTargets": []
  }
}