ansible-roles/postgresql/tasks/munin.yml

---
- name: Are Munin plugins present in /etc ?
  ansible.builtin.stat:
    path: /etc/munin/plugins
  register: etc_munin_plugins

- name: Are Munin plugins present in /usr/share ?
  ansible.builtin.stat:
    path: /usr/share/munin/plugins
  register: usr_share_munin_plugins

- name: Add Munin plugins for PostgreSQL
  ansible.builtin.file:
    state: link
    src: '/usr/share/munin/plugins/{{ item }}'
    dest: '/etc/munin/plugins/{{ item }}'
  loop:
    - postgres_bgwriter
    - postgres_checkpoints
    - postgres_connections_db
    - postgres_users
    - postgres_xlog
  notify: restart munin-node
  when: etc_munin_plugins.stat.exists and usr_share_munin_plugins.stat.exists

- name: Add Munin plugins for PostgreSQL (for specific databases)
  ansible.builtin.file:
    state: link
    src: '/usr/share/munin/plugins/{{ item[0] }}'
    dest: '/etc/munin/plugins/{{ item[0] }}{{ item[1] }}'
  loop: "{{ _plugins | product(_databases) | list }}"
  vars:
    _plugins:
      - 'postgres_cache_'
      - 'postgres_connections_'
      - 'postgres_locks_'
      - 'postgres_querylength_'
      - 'postgres_scans_'
      - 'postgres_size_'
      - 'postgres_transactions_'
      - 'postgres_tuples_'
    _databases: "{{ postgresql_databases }}"
  notify: restart munin-node
  when: etc_munin_plugins.stat.exists and usr_share_munin_plugins.stat.exists