prometheus/cmd/promtool/testdata/config_with_service_discovery_files.yml

scrape_configs:
  - job_name: prometheus
    file_sd_configs:
      - files:
          - nonexistent_file.yml
alerting:
  alertmanagers:
    - scheme: http
      api_version: v1
      file_sd_configs:
        - files:
            - nonexistent_file.yml