dummy.yml

---    
- hosts: servera
  gather_facts: false
  tasks:
    - debug:
        msg: "{{ inventory_hostname }}"
       
    - pause:
       
- hosts: localhost
  vars:
    new_hosts:
      - servera
      - serverb
      - serverc
  tasks:
    - debug:
        var: groups
       
    - pause:
       
    - add_host:
        name: "{{ item }}"
        group: webservers
        ansible_host: localhost
        ansible_connection: local
      loop: "{{ new_hosts }}"
       
       
- hosts: localhost
  tasks:
    - debug:
        var: groups
       
    - pause:
       
       
- hosts: servera
  gather_facts: false
  tasks:
    - debug:
        msg: "{{ inventory_hostname }}"
       
    - pause:
       
    - meta: refresh_inventory
       
       
- hosts: localhost
  tasks:
    - debug:
        var: groups