Bug: using the 'always' tag for task includes doesn't work

[haubenr]

Some of the playbooks make use of tags, including the pre-defined tag 'always'. For some playbooks this actually doesn't work (e.g. the tuning playbook) as the tasks included by the tagged include_tasks task do not actually use the tag themselves. See here for details (pay attention to the fine details): https://docs.ansible.com/ansible/latest/playbook_guide/playbooks_tags.html#adding-tags-to-includes

[haubenr]

Error message reported by user (for reference):

TASK [tuning : shutdown cluster nodes via libvirt] *******************************************************************
fatal: [XXXXXX]: FAILED! => 
  msg: '''worker_domains'' is undefined. ''worker_domains'' is undefined'