---
- name: Check if desired snapshot exists in PVE
  uri:
    url             : "{{ __pve_endpoint }}/nodes/{{ item.vm_host | default(__pve_node) }}/qemu/{{ item.vmid }}/snapshot/{{ __lab_snapshot_name }}/config"
    method          : GET
    headers         :
      Content-type  : "application/x-www-form-urlencoded"
      Authorization : "{{ __pve_token }}"
      node          : "{{ item.vm_host | default(__pve_node) }}"
      vmid          : "{{ item.vmid }}"
    return_content  : no
    validate_certs  : no
    status_code     :
      - 200
      - 500
  register          : r_snapshot_list
  loop              : "{{ lab_nodes }}"
  loop_control      :
    label           : "{{ item.name }}"


- name: Create VM snapshot if one doesn't exist
  uri:
    url             : "{{ __pve_endpoint }}/nodes/{{ item.item.vm_host | default(__pve_node) }}/qemu/{{ item.item.vmid }}/snapshot"
    method          : POST
    headers         :
      Content-type  : "application/x-www-form-urlencoded"
      Authorization : "{{ __pve_token }}"
    body_format     : form-urlencoded
    body            :
      node          : "{{ item.item.vm_host | default(__pve_node) }}"
      vmid          : "{{ item.item.vmid }}"
      snapname      : "{{ __lab_snapshot_name }}"
    return_content  : no
    validate_certs  : no
  register          : r_snapshot_create
  loop              : "{{ r_snapshot_list.results }}"
  loop_control      :
    label           : "[{{ item.item.vmid }}] {{ item.item.name }}"
  when              :
    - item.msg is search("Error")


...