Alertmanager Cluster Setup

inventory

[alertmanagers]
10.250.250.1
10.250.250.2
10.250.250.3

playbook.yml

---
- hosts: alertmanagers
  become: true
  pre_tasks:
    - name: Get other alertmanager peers
      set_fact:
        alertmanager_peers: "{{ groups['alertmanagers'] | reject('search', ansible_host) | list }}"

    - name: Create alertmanager option list
      set_fact:
        alertmanager_peer_option_list: "{{ alertmanager_peer_option_list|default([]) + ['--cluster.peer=' + item + ':9094'] }}"
      loop: "{{ alertmanager_peers }}"

    - name: Create alertmanager peer options
      set_fact:
        alertmanager_peer_options: "{{ alertmanager_peer_option_list | join(' ') }}"

  roles:
    - name: mesaguy.prometheus
      vars:
        prometheus_manage_client_tgroups: false
        prometheus_alertmanager_extra_opts:
          - "{{ alertmanager_peer_options }}"
          - "--cluster.listen-address=:9094"
        prometheus_components:
          - alertmanager

requirements.yml

- src: mesaguy.prometheus
  version: v0.9.2