{% for groupname in groups.keys() | difference(['all','ungrouped'] + nagios_excluded_groups) %}
{% if groups[groupname] | reject('in', nagios_excluded_groups | map('extract', groups) | flatten) %}
define hostgroup {
  hostgroup_name  {{ groupname }}
  alias           {{ groupname | replace('_', ' ') | title }}
  members         {{ groups[groupname] | reject('in', nagios_excluded_groups | map('extract', groups) | flatten) | join(',') }}
}

{% endif %}
{% endfor %}