---
- name: 'install monitoring agent requirements'
  apt:
    pkg: 'monitoring-plugins-basic'
    state: 'present'
    update_cache: true
    cache_valid_time: 3600
  tags:
    - 'packages'

- name: 'add monitoring plugin - check_mem.pl'
  copy:
    src: 'check_mem.pl'
    dest: '/usr/lib/nagios/plugins/check_mem.pl'
    mode: '0755'

- name: 'create monitoring user'
  user:
    name: 'icinga'
    state: 'present'
  tags:
    - 'monitoring'

- name: 'create monitoring entry'
  set_fact:
    agent_monitoring_entry: >
      {{ {
            host_fqdn: {
                         'address': ansible_host,
                         'agent_type': 'ssh',
                       }
         } }}
  tags:
    - 'monitoring'

- name: 'update monitoring facts'
  set_fact:
    monitoring_facts: >
      {{ hostvars[monitoring_host]['monitoring_facts']
          | default({})
          | combine(agent_monitoring_entry, recursive=true) }}
  delegate_facts: true
  delegate_to: '{{ monitoring_host }}'
  tags:
    - 'monitoring'
...