[
  {version, 1},
  {nodes, [
{% for host in groups['rabbitmq'] %}    {'rabbit@{{ hostvars[host]['ansible_hostname'] }}', disc}{% if not loop.last %},{% endif %}

{% endfor %}
  ]},
  {gospel, {node, 'rabbit@{{ hostvars[groups['rabbitmq'][0]]['ansible_hostname'] }}'}}
].