matrix-docker-ansible-deploy/roles/custom/matrix-prometheus-postgres-exporter/tasks/validate_config.yml

---

- name: Fail if required prometheus-postgres-exporter settings not defined
  ansible.builtin.fail:
    msg: >
      You need to define a required configuration setting (`{{ item }}`).      
  when: "vars[item] == ''"
  with_items:
    - matrix_prometheus_postgres_exporter_database_hostname