title: How to list all currently targeted hosts in an Ansible play
body: <p>I am running an Ansible play and would like to list all the hosts targeted by it. Ansible docs <a href="http://docs.ansible.com/playbooks_delegation.html#run-once">mentions that this is possible</a>, but their method doesn't seem to work with a complex targeted group (targeting like hosts: web_servers:&amp;data_center_primary) </p>
  
  <p>I'm sure this is doable, but cant seem to find any further documentation on it. Is there a var with all the currently targeted hosts?</p>