普罗米修斯从公制标签创建标签 [英] Prometheus create label from metric label

问题描述

我们正在容器中运行节点导出器.为了快速确定每个节点导出器在哪个主机上运行，​​我创建了一个如下所示的指标:host{host="$HOSTNAME",node="$CONTAINER_ID"} 1

We are running the node-exporter in containers. To quickly identify on which host each node-exporter is running, I created a metric that looks like this: host{host="$HOSTNAME",node="$CONTAINER_ID"} 1

我正在寻找一种方法来提取 host= 中的主机名，并为每个节点导出器实例创建一个标签作为主机名标签.我尝试了多种配置，但似乎都不起作用.当前的 prometheus 配置如下所示:

I'm looking for a way to extract the hostname in host= and create a label for each node-exporter instance as a hostname label. I tried numerous configurations and none seem to work. Current prometheus config looks like this:

scrape_configs:
   - job_name: 'node'
     scrape_interval: 10s
     scrape_timeout: 5s
     metrics_path: /metrics
     scheme: http
     dns_sd_configs:
     - names:
     - tasks.master-nodeexporter
       refresh_interval: 30s
       type: A
       port: 9100
     relabel_configs:
     - source_labels: ['host']
       regex: '"(.*)".*'
       target_label: 'hostname'
       replacement: '$1'

推荐答案

这是不可能的，因为目标重新标记发生在刮取之前.

This is not possible, as target relabelling happens before the scrape.

您首先要做的是使用服务发现来获得正确的主机名，而 dns_sd_configs 则无法做到这一点.您可能会查看 Consul 和 https://www.robustperception.io/controlling 之类的内容-实例标签/

What you want to do here is use service discovery to have the right hostname in the first place, which is not possible with dns_sd_configs. You might look at something like Consul and https://www.robustperception.io/controlling-the-instance-label/

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