Prometheus - Relabel

通過對标簽的重命名進行重整操作，便于統一化管理或者服務更新前後管理。

原始資料：

cat targets/node-exporter.yml

- targets:
  - "172.20.31.195:9100"
  labels:
    __os__: "linux"
    __release__: "redhat"
- targets:
  - "172.20.31.196:9100"
  labels:
    __os__: "linux"
    __release__: "centos"
- targets:
  - "172.20.31.197:9100"
  labels:
    __os__: "linux"
    __release__: "centos"      

replace: 對原有的标簽進行更名

scrape_configs:
  - job_name: 'node-exporter'
    file_sd_configs:
    - files:
      - targets/node-exporter.yml
      refresh_interval: 1m
    relabel_configs:
    - source_labels:
      - "__os__"
      regex: "(.*)"
      target_label: "os"
      action: replace
      replacement: "$1"      

replace-separator: 對字段進行合并處理

scrape_configs:
  - job_name: 'node-exporter'
    file_sd_configs:
    - files:
      - targets/node-exporter.yml
      refresh_interval: 1m
    relabel_configs:
    - source_labels:
      - "__os__"
      - "__release__"
      separator: "-"
      regex: "(.*)"
      target_label: "os_release"
      action: replace
      replacement: "$1"      

keep: 滿足特定條件的執行個體進行采集，其他的不采集。

scrape_configs:
  - job_name: 'node-exporter'
    file_sd_configs:
    - files:
      - targets/node-exporter.yml
      refresh_interval: 1m
    relabel_configs:
    - source_labels:
      - "__release__"
      regex: "redhat"
      action: keep      

drop： 滿足特定條件的執行個體不采集，其他的采集。

scrape_configs:
  - job_name: 'node-exporter'
    file_sd_configs:
    - files:
      - targets/node-exporter.yml
      refresh_interval: 1m
    relabel_configs:
    - source_labels:
      - "__release__"
      regex: "redhat"
      action: drop      

labelkeep： 對抓取的執行個體特定标簽進行保留，其他标簽删除。

scrape_configs:
  - job_name: 'node-exporter'
    file_sd_configs:
    - files:
      - targets/node-exporter.yml
      refresh_interval: 1m
    relabel_configs: 
    - source_labels:
      - "__os__"
      regex: "(.*)"
      target_label: "os"
      action: replace
      replacement: "$1"
    - source_labels:
      - "__release__"
      regex: "(.*)"
      target_label: "release"
      action: replace
      replacement: "$1"
    - regex: "jobs"
      action: labelkeep      

labeldrop： 對抓取的執行個體特定标簽進行删除。

scrape_configs:
  - job_name: 'node-exporter'
    file_sd_configs:
    - files:
      - targets/node-exporter.yml
      refresh_interval: 1m
    relabel_configs: 
    - source_labels:
      - "__os__"
      regex: "(.*)"
      target_label: "os"
      action: replace
      replacement: "$1"
    - source_labels:
      - "__release__"
      regex: "(.*)"
      target_label: "release"
      action: replace
      replacement: "$1"
    - regex: "os"
      action: labeldrop      

hashmod：将target_label設定成source_label的modulus配置的hash值；

labelmap：将regex比對到的所有标簽的名稱配置成新的标簽，值配置成新标簽的值；