To Reproduce Steps to reproduce the behavior:

1. Create a multi stack deployment in RHOSO17.1.2.
2. Do the minor update to the latest OSP17.1.6.
3. openstack overcloud external-update run --tags ovn failed with the following error.

   2025-05-20 19:14:42.761642 | <UUID> |       TASK | Now rotate all ovn_metadata_agents
   2025-05-20 19:14:42.810753 | <UUID> |      FATAL | Now rotate all ovn_metadata_agents | undercloud | error={"msg": "'dict object' has no attribute 'ovn_metadata'. 'dict object' has no attribute 'ovn_metadata'"}
   

Expected behavior

• The command doesn't fail.

Bug impact

• By this issue, a user cannot do a minor update to the latest one.

Known workaround

• Not available.
  The task should check the existence of group['ovn_metadata'] like below(I'm not good at ansible though)

                  - name: Now rotate all ovn_metadata_agents
                    delegate_to: "{{ item }}"
                    become: true
                    tripleo_container_manage:
                      config_dir: "/var/lib/tripleo-config/container-startup-config/step_4"
                      config_id:
                        - 'ovn_metadata_agent'
                      config_patterns: "*ovn_metadata_agent.json"
                      config_overrides:
                        ".*ovn_metadata_agent":
                          image: {get_param: ContainerOvnMetadataImage}
                          name: "ovn_metadata_agent"
                    loop: "{{groups['ovn_metadata'] | difference(groups['excluded_overcloud']) }}"
                    # pause for 1 second to give time to dbs and clients to recover between restarts
                    loop_control:
                      pause: 1
                    when:
                      - groups['ovn_metadata']