kolla-ansible/ansible/roles/prometheus/tasks/config.yml

---
- name: Ensuring config directories exist
  become: true
  file:
    path: "{{ node_config_directory }}/{{ item.key }}"
    state: "directory"
    owner: "{{ config_owner_user }}"
    group: "{{ config_owner_group }}"
    mode: "0770"
  when:
    - inventory_hostname in groups[item.value.group]
    - item.value.enabled | bool
  with_dict: "{{ prometheus_services }}"

- include_tasks: copy-certs.yml
  when:
    - kolla_copy_ca_into_containers | bool

- name: Copying over config.json files
  become: true
  template:
    src: "{{ item.key }}.json.j2"
    dest: "{{ node_config_directory }}/{{ item.key }}/config.json"
    mode: "0660"
  when:
    - inventory_hostname in groups[item.value.group]
    - item.value.enabled | bool
  with_dict: "{{ prometheus_services }}"
  notify:
    - Restart {{ item.key }} container

- name: Find custom prometheus alert rules files
  find:
    path: "{{ node_custom_config }}/prometheus/"
    pattern: "*.rules"
  run_once: True
  delegate_to: localhost
  register: prometheus_alert_rules
  when:
    - enable_prometheus_alertmanager | bool

- name: Copying over custom prometheus alert rules files
  become: true
  vars:
    service: "{{ prometheus_services['prometheus-server'] }}"
  copy:
    src: "{{ item.path }}"
    dest: "{{ node_config_directory }}/prometheus-server/{{ item.path | basename }}"
    mode: "0660"
  when:
    - inventory_hostname in groups[service.group]
    - service.enabled | bool and enable_prometheus_alertmanager | bool
    - prometheus_alert_rules is defined and prometheus_alert_rules.files | length > 0
  with_items: "{{ prometheus_alert_rules.files }}"
  notify:
    - Restart prometheus-server container

- name: Find prometheus common config overrides
  find:
    # NOTE(wszumski): Non-existent paths don't produce a failure
    paths:
      - "{{ node_custom_config }}/prometheus/prometheus.yml.d"
    patterns: "*.yml"
  delegate_to: localhost
  register: prometheus_common_config_overrides_result
  run_once: true

- name: Find prometheus host config overrides
  find:
    # NOTE(wszumski): Non-existent paths don't produce a failure
    paths:
      - "{{ node_custom_config }}/prometheus/{{ inventory_hostname }}/prometheus.yml.d"
    patterns: "*.yml"
  delegate_to: localhost
  register: prometheus_host_config_overrides_result
  # NOTE(yoctozepto): this cannot be run_once
  run_once: false

- name: Copying over prometheus config file
  become: true
  vars:
    service: "{{ prometheus_services['prometheus-server'] }}"
    common_overrides: "{{ prometheus_common_config_overrides_result.files | map(attribute='path') | list }}"
    host_overrides: "{{ prometheus_host_config_overrides_result.files | map(attribute='path') | list }}"
  merge_yaml:
    sources: "{{ [item] + common_overrides + host_overrides }}"
    dest: "{{ node_config_directory }}/prometheus-server/prometheus.yml"
    mode: "0660"
    extend_lists: true
  when:
    - inventory_hostname in groups[service.group]
    - service.enabled | bool
  with_first_found:
    - "{{ node_custom_config }}/prometheus/{{ inventory_hostname }}/prometheus.yml"
    - "{{ node_custom_config }}/prometheus/prometheus.yml"
    - "{{ role_path }}/templates/prometheus.yml.j2"
  notify:
    - Restart prometheus-server container

- name: Copying over prometheus alertmanager config file
  become: true
  vars:
    service: "{{ prometheus_services['prometheus-alertmanager'] }}"
  template:
    src: "{{ item }}"
    dest: "{{ node_config_directory }}/prometheus-alertmanager/prometheus-alertmanager.yml"
    mode: "0660"
  when:
    - inventory_hostname in groups[service.group]
    - service.enabled | bool
  with_first_found:
    - "{{ node_custom_config }}/prometheus/{{ inventory_hostname }}/prometheus-alertmanager.yml"
    - "{{ node_custom_config }}/prometheus/prometheus-alertmanager.yml"
    - "{{ role_path }}/templates/prometheus-alertmanager.yml.j2"
  notify:
    - Restart prometheus-alertmanager container

- name: Copying over my.cnf for mysqld_exporter
  become: true
  vars:
    service: "{{ prometheus_services['prometheus-mysqld-exporter'] }}"
  merge_configs:
    sources:
      - "{{ node_custom_config }}/prometheus-mysqld-exporter/{{ inventory_hostname }}/my.cnf"
      - "{{ node_custom_config }}/prometheus-mysqld-exporter/my.cnf"
      - "{{ role_path }}/templates/my.cnf.j2"
    dest: "{{ node_config_directory }}/prometheus-mysqld-exporter/my.cnf"
    mode: "0660"
  when:
    - inventory_hostname in groups[service.group]
    - service.enabled | bool
  notify:
    - Restart prometheus-mysqld-exporter container

- name: Copying cloud config file for openstack exporter
  become: true
  vars:
    service: "{{ prometheus_services['prometheus-openstack-exporter'] }}"
  template:
    src: "{{ item }}"
    dest: "{{ node_config_directory }}/prometheus-openstack-exporter/clouds.yml"
    mode: "0660"
  when:
    - inventory_hostname in groups[service.group]
    - service.enabled | bool
  with_first_found:
    - "{{ node_custom_config }}/prometheus-openstack-exporter/{{ inventory_hostname }}/clouds.yml"
    - "{{ node_custom_config }}/prometheus-openstack-exporter/clouds.yml"
    - "{{ role_path }}/templates/clouds.yml.j2"
  notify:
    - Restart prometheus-openstack-exporter container

- name: Copying config file for blackbox exporter
  become: true
  vars:
    service: "{{ prometheus_services['prometheus-blackbox-exporter'] }}"
  template:
    src: "{{ item }}"
    dest: "{{ node_config_directory }}/prometheus-blackbox-exporter/prometheus-blackbox-exporter.yml"
    mode: "0660"
  when:
    - inventory_hostname in groups[service.group]
    - service.enabled | bool
  with_first_found:
    - "{{ node_custom_config }}/prometheus/{{ inventory_hostname }}/prometheus-blackbox-exporter.yml"
    - "{{ node_custom_config }}/prometheus/prometheus-blackbox-exporter.yml"
    - "{{ role_path }}/templates/prometheus-blackbox-exporter.yml.j2"
  notify:
    - Restart prometheus-blackbox-exporter container

- block:
    - name: Find extra prometheus server config files
      find:
        paths: "{{ node_custom_config }}/prometheus/extras/"
        patterns: "*"
        recurse: true
      delegate_to: localhost
      register: prometheus_config_extras_result
      run_once: true

    - name: Create subdirectories for extra config files
      become: true
      vars:
        dirs: >-
          {{ prometheus_config_extras_result.files | default([])
          | map(attribute='path') | map('dirname') | unique
          | map('relpath', base) | list }}          
      file:
        path: "{{ node_config_directory }}/prometheus-server/{{ item }}"
        state: "directory"
        owner: "{{ config_owner_user }}"
        group: "{{ config_owner_group }}"
        mode: "0770"
        recurse: true
      with_items: "{{ dirs }}"

    - name: Template extra prometheus server config files
      become: true
      vars:
        relpath: "{{ item | relpath(base) }}"
      template:
        src: "{{ item }}"
        dest: "{{ node_config_directory }}/prometheus-server/{{ relpath }}"
        mode: "0660"
      with_items: "{{ prometheus_config_extras_result.files | default([]) | map(attribute='path') | list }}"
      notify:
        - Restart prometheus-server container
  vars:
    base: "{{ node_custom_config }}/prometheus/"
    service: "{{ prometheus_services['prometheus-server'] }}"
  when:
    - inventory_hostname in groups[service.group]
    - service.enabled | bool