---
# Deploy monitoring stack to london-a (Prometheus + Grafana).
# Usage: ansible-playbook playbooks/monitoring.yml
#        ansible-playbook playbooks/monitoring.yml --check --diff

- name: "Monitoring stack (london-a)"
  hosts: london-a
  pre_tasks:
    - name: Load secrets
      ansible.builtin.include_vars:
        file: "{{ playbook_dir }}/../group_vars/all/secrets.yaml"
      no_log: true
  tasks:
    - name: Check for Prometheus config
      delegate_to: localhost
      ansible.builtin.stat:
        path: "{{ playbook_dir }}/../services/prometheus/prometheus.yml"
      register: prometheus_config

    - name: Deploy Prometheus config
      ansible.builtin.copy:
        src: "{{ playbook_dir }}/../services/prometheus/prometheus.yml"
        dest: /usr/local/etc/prometheus.yml
        mode: '0644'
        backup: true
      when: prometheus_config.stat.exists
      notify: Restart prometheus

    - name: Deploy Prometheus alerting rules
      ansible.builtin.copy:
        src: "{{ playbook_dir }}/../services/prometheus/rules/"
        dest: /usr/local/etc/prometheus/rules/
        mode: '0644'
      failed_when: false
      notify: Restart prometheus

    - name: Ensure unified_alerting section exists in Grafana config
      ansible.builtin.lineinfile:
        path: /usr/local/etc/grafana/grafana.ini
        regexp: '^\[unified_alerting\]'
        line: '[unified_alerting]'
      notify: Restart grafana

    - name: Allow provenance status change in Grafana
      ansible.builtin.lineinfile:
        path: /usr/local/etc/grafana/grafana.ini
        regexp: '^allow_prov_status_change'
        insertafter: '^\[unified_alerting\]'
        line: 'allow_prov_status_change = true'
      notify: Restart grafana

    - name: Deploy Grafana dashboards
      ansible.posix.synchronize:
        src: "{{ playbook_dir }}/../services/grafana/dashboards/"
        dest: /usr/local/etc/grafana/dashboards/
      failed_when: false

    - name: Ensure provisioning dir exists
      ansible.builtin.file:
        path: "{{ grafana_provisioning_dir }}"
        state: directory
        mode: '0755'

    - name: Ensure alerting dir exists
      ansible.builtin.file:
        path: "{{ grafana_provisioning_dir }}/alerting"
        state: directory
        mode: '0755'

    - name: Deploy Grafana provisioning
      ansible.posix.synchronize:
        src: "{{ playbook_dir }}/../services/grafana/provisioning/"
        dest: "{{ grafana_provisioning_dir }}/"
      failed_when: false

    - name: Template contact points with PagerDuty key
      ansible.builtin.template:
        src: "{{ playbook_dir }}/../services/grafana/provisioning/alerting/contact-points.yml"
        dest: "{{ grafana_provisioning_dir }}/alerting/contact-points.yml"
        mode: '0640'
        owner: root
        group: grafana
      no_log: true
      notify: Restart grafana

  handlers:
    - name: Restart prometheus
      ansible.builtin.service:
        name: prometheus
        state: restarted

    - name: Restart grafana
      ansible.builtin.service:
        name: grafana
        state: restarted