Ansible playbook to discover all the hosts which have the check_mk agent setup.

discover_checkmk.yml

- hosts: all
vars:
- monitoring_agent : "nrpe_server"
tasks:
- name: test check_mk
local_action: wait_for port=6556 timeout=2 host={{inventory_hostname}}
register: check_mk
ignore_errors: True
- name: set fact
set_fact: monitoring_agent="check_mk_agent"
when: check_mk.elapsed < 2
- name: add to groups
group_by: key={{monitoring_agent}}
- name: print
local_action: template src=dumpall.j2 dest=/tmp/ansible.all