Prometheus Scratchpad

node_exporters.json

[
    {
        "labels": {
            "job": "nodes"
        },
        "targets": [
            "host1", "host2", "host3"
        ]
    }
]

scrape-node-exporters.yml

scrape_configs:
  - job_name: 'nodes'
    file_sd_configs:
      - files:
        - 'node_exporters.json'  # ..., targets: ['host1','host2',...] ...
    relabel_configs:
      - source_labels: [__address__]
        target_label: instance  # keep instance=host1 as the label
      - source_labels: [__address__]
        regex:  '(.*)'
        target_label: __address__
        replacement: '${1}:9100' # host1:9100