Comment 6 for bug 1979208

I can't say issue is solved, it's just a workaround. In the meanwhile we need to introduce a way to run this in serial mode and likely re-arrange some workflow.

zun_serial controls serial execution in the playbook. You can check Ansible documentation on serial here: https://docs.ansible.com/ansible/latest/user_guide/playbooks_strategies.html#setting-the-batch-size-with-serial