Pi-hole blackbox probe to test DNS blocking

blackbox.yml

modules:
  pi-hole-test:
    prober: dns
    timeout: 5s
    dns:
      query_name: pagead2.googlesyndication.com
      query_type: A
      validate_answer_rrs:
        fail_if_not_matches_regexp:
          - ".*0.0.0.0"

prometheus.yml

scrape_configs:
  - job_name: pi-hole-test
    metrics_path: /probe
    params:
      module: [pi-hole-test]
    static_configs:
      - targets:
        - 192.168.0.2
    relabel_configs:
      - source_labels: [__address__]
        target_label: __param_target
      - source_labels: [__param_target]
        target_label: instance
      - target_label: __address__
        replacement: 127.0.0.1:9115