add alertmanager role

roles/alertmanager/tasks/configure.yaml

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+---
+- name: create group
+  group:
+    name: "{{ alertmanager_group }}"
+    system: true
+    state: "{{ alertmanager_group_state | default('present') }}"
+
+- name: create user
+  user:
+    name: "{{ alertmanager_user }}"
+    system: true
+    shell: "{{ alertmanager_user_shell }}"
+    group: "{{ alertmanager_group }}"
+    createhome: false
+    home: "{{ alertmanager_var_path }}"
+    state: "{{ alertmanager_user_state | default('present') }}"
+
+- name: create etc path
+  file:
+    path: "{{ alertmanager_etc_path }}"
+    state: directory
+    owner: "{{ alertmanager_etc_owner }}"
+    group: "{{ alertmanager_etc_group }}"
+    mode: "{{ alertmanager_etc_mode }}"
+
+- name: create var path
+  file:
+    path: "{{ alertmanager_var_path }}"
+    state: directory
+    owner: "{{ alertmanager_var_owner }}"
+    group: "{{ alertmanager_var_group }}"
+    mode: "{{ alertmanager_var_mode }}"
+
+- name: configure
+  copy:
+    dest: "{{ alertmanager_etc_path }}/alertmanager.yaml"
+    content: "{{ (alertmanager_config | default({})) | to_nice_yaml }}"
+    owner: root
+    group: root
+    mode: 0444
+  notify: restart alertmanager
+
+- name: configure systemd template
+  template:
+    src: alertmanager.service.j2
+    dest: /etc/systemd/system/alertmanager.service
+    owner: root
+    group: root
+    mode: 0444
+  notify: restart alertmanager
+
+- name: manage service
+  service:
+    name: "{{ alertmanager_service_name }}"
+    enabled: "{{ alertmanager_service_enabled }}"
+    state: "{{ alertmanager_service_state }}"

roles/alertmanager/tasks/install.yaml

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+---
+- block:
+  - name: download tar
+    get_url:
+      url: "{{ alertmanager_release_url }}"
+      dest: "{{ alertmanager_download_path }}"
+      checksum: "{{ alertmanager_checksum }}"
+    register: dl
+    until: dl is success
+    retries: 5
+    delay: 10
+
+  - name: extract tar
+    unarchive:
+      src: "{{ alertmanager_download_path }}"
+      dest: "{{ alertmanager_unarchive_dest_path }}"
+      creates: "{{ alertmanager_extracted_path }}/alertmanager"
+      remote_src: true
+
+  - name: install binaries
+    copy:
+      src: "{{ alertmanager_extracted_path }}/{{ item }}"
+      dest: "{{ alertmanager_bin_path }}/{{ item }}"
+      owner: root
+      group: root
+      mode: 0755
+      remote_src: true
+    loop:
+      - alertmanager
+      - amtool
+    notify: restart alertmanager
+  when: alertmanager_version != alertmanager_local_version

roles/alertmanager/tasks/main.yaml

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+---
+- name: gather os specific variables
+  include_vars: "{{ lookup('first_found', possible_files) }}"
+  vars:
+    possible_files:
+      files:
+        - "{{ ansible_distribution }}-{{ ansible_distribution_version }}.yaml"
+        - "{{ ansible_distribution }}.yaml"
+        - "{{ ansible_os_family }}.yaml"
+        - "default.yaml"
+      paths:
+        - vars
+
+- name: include os specific tasks
+  include_tasks: "{{ lookup('first_found', possible_files) }}"
+  vars:
+    possible_files:
+      files:
+        - "{{ ansible_distribution }}-{{ ansible_distribution_version }}.yaml"
+        - "{{ ansible_distribution }}.yaml"
+        - "{{ ansible_os_family }}.yaml"
+        - "default.yaml"
+      paths:
+        - tasks
+
+- include: pre.yaml
+
+- include: install.yaml
+
+- include: configure.yaml

roles/alertmanager/tasks/pre.yaml

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+---
+- name: determine if installed
+  stat:
+    path: "{{ alertmanager_bin_path }}/alertmanager"
+  register: st
+
+- name: set alertmanager_installed
+  set_fact:
+    alertmanager_installed: "{{ st.stat.exists | bool }}"
+
+- block:
+  - name: determine latest version
+    uri:
+      url: https://api.github.com/repos/prometheus/alertmanager/releases/latest
+      return_content: true
+      body_format: json
+    register: _latest_version
+    until: _latest_version.status == 200
+    retries: 3
+
+  - name: set alertmanager_version
+    set_fact:
+      alertmanager_version: "{{ _latest_version.json['tag_name'] | regex_replace('^v', '') }}"
+
+- block:
+  - name: determine installed version
+    command: "{{ alertmanager_bin_path }}/alertmanager --version"
+    register: _installed_version_string
+    changed_when: false
+
+  - name: set alertmanager_local_version
+    set_fact:
+      alertmanager_local_version: "{{ _installed_version_string.stdout | regex_search(alertmanager_version_regex, '\\1') | first }}"
+  when: alertmanager_installed
+
+- name: set alertmanager_local_version to 0
+  set_fact:
+    alertmanager_local_version: "0"
+  when: not alertmanager_installed
+
+- block:
+  - name: get checksums
+    set_fact:
+      _checksums: "{{ lookup('url', alertmanager_checksum_url, wantlist=True) }}"
+
+  - name: set alertmanager_checksum
+    set_fact:
+      alertmanager_checksum: "sha256:{{ item.split(' ') | first }}"
+    loop: "{{ _checksums }}"
+    when: "alertmanager_release_file in item"