---
- name: Say hi role
  ansible.builtin.debug:
    msg: "Hi."

- name: Debug client_ips
  ansible.builtin.debug:
    msg: "{{ client_ips }}"
  when:
    - client_ips is defined

- name: Debug namehost
  ansible.builtin.debug:
    msg: "{{ namehost }}"
  when:
    - namehost is defined

...