---
- name: Install Prometheus
  apt:
    update_cache: true
    name:
      - prometheus
      - prometheus-snmp-exporter
      - snmp-mibs-downloader  # To generate SNMP configuration
  register: apt_result
  retries: 3
  until: apt_result is succeeded

- name: Configure Prometheus
  template:
    src: prometheus/prometheus.yml.j2
    dest: /etc/prometheus/prometheus.yml
  notify: Restart Prometheus

- name: Configure Prometheus alert rules
  template:
    src: prometheus/alert.rules.yml.j2
    dest: /etc/prometheus/alert.rules.yml
  notify: Restart Prometheus

# Doesn't work on Debian Stretch
- name: Make Prometheus snmp-exporter listen on adm only
  when:
    - ansible_lsb.codename == 'buster'
  lineinfile:
    path: /etc/default/prometheus-snmp-exporter
    regexp: '^ARGS='
    line: "ARGS=\"--web.listen-address={{ ansible_fqdn }}:9116\""
  notify: Restart prometheus-snmp-exporter

# We don't need to restart Prometheus when updating nodes
- name: Configure Prometheus nodes
  copy:
    content: "{{ prometheus_targets | to_nice_json }}"
    dest: /etc/prometheus/targets.json

# We don't need to restart Prometheus when updating nodes
- name: Configure Prometheus SNMP devices
  copy:
    content: "{{ prometheus_snmp_targets | to_nice_json }}"
    dest: /etc/prometheus/targets_snmp.json

- name: Activate prometheus service
  systemd:
    name: prometheus
    enabled: yes
    state: started