matrix-docker-ansible-deploy/roles/custom/matrix-synapse-usage-exporter/tasks/validate_config.yml

---

- name: (Deprecation) Catch and report renamed matrix-synapse-usage-exporter settings
  ansible.builtin.fail:
    msg: >-
      Your configuration contains a variable, which now has a different name.
      Please change your configuration to rename the variable (`{{ item.old }}` -> `{{ item.new }}`).
  when: "item.old in vars"
  with_items:
    - {'old': 'matrix_synapse_usage_exporter_docker_image_name_prefix', 'new': 'matrix_synapse_usage_exporter_container_image_registry_prefix'}