feat(alertmanager_receiver): add role

playbooks/alertmanager_receiver.yml

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+---
+- name: Deploy matrix-alertmanager-receiver
+  hosts: "{{ matrix_alertmanager_receiver_hosts | default('matrix_alertmanager_receiver') }}"
+  become: "{{ matrix_alertmanager_receiver_become | default(false) }}"
+  gather_facts: "{{ matrix_alertmanager_receiver_gather_facts | default(false) }}"
+  roles:
+    - role: finallycoffee.matrix.alertmanager_receiver

roles/alertmanager-receiver/README.md

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+# `finallycoffee.matrix.alertmanager_receiver` ansible role
+
+This ansible role deploys and configures
+[`matrix-alertmanager-receiver`](https://github.com/metio/matrix-alertmanager-receiver),
+a fork of [https://git.sr.ht/~fnux/matrix-alertmanager-receiver] with more features.
+For futher information, see [the project's `README`](https://github.com/metio/matrix-alertmanager-receiver?tab=readme-ov-file#matrix-alertmanager-receiver-).
+
+## Configuration
+
+### Required configuration
+
+The following variables *must* be populated or else the role will be unable to
+set up the service successfully:
+
+- `alertmanager_receiver_config_matrix_homeserver_url` - matrix homeserver URL
+- `alertmanager_receiver_config_matrix_user_id` - full userid (`@user:instance.tld`)
+- `alertmanager_receiver_config_matrix_access_token` - access token for that user

roles/alertmanager-receiver/defaults/main/config.yml

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+---
+alertmanager_receiver_config_http_address: 127.0.0.1
+alertmanager_receiver_config_http_port: 12345
+alertmanager_receiver_config_http_alerts_path_prefix: "/alerts"
+alertmanager_receiver_config_http_metrics_path: "/metrics"
+alertmanager_receiver_config_http_metric_enabled: true
+alertmanager_receiver_config_http_basic_username: "alertmanager"
+alertmanager_receiver_config_http_basic_password: ~
+alertmanager_receiver_config_http:
+  address: "{{ alertmanager_receiver_config_http_address }}"
+  port: "{{ alertmanager_receiver_config_http_port }}"
+  "alerts-path-prefix": "{{ alertmanager_receiver_config_http_alerts_path_prefix }}"
+  "metrics-path": "{{ alertmanager_receiver_config_http_metrics_path }}"
+  "metrics-enabled": "{{ alertmanager_receiver_config_http_metric_enabled }}"
+  "basic-username": "{{ alertmanager_receiver_config_http_basic_username }}"
+  "basic-password": "{{ alertmanager_receiver_config_http_basic_password }}"
+alertmanager_receiver_config_matrix_homeserver_url: ~
+alertmanager_receiver_config_matrix_user_id: ~
+alertmanager_receiver_config_matrix_access_token: ~
+alertmanager_receiver_config_matrix_proxy: ""
+alertmanager_receiver_config_matrix_room_mapping: {}
+alertmanager_receiver_config_matrix:
+  "homeserver-url": "{{ alertmanager_receiver_config_matrix_homeserver_url }}"
+  "user-id": "{{ alertmanager_receiver_config_matrix_user_id }}"
+  "access-token": "{{ alertmanager_receiver_config_matrix_access_token }}"
+  proxy: "{{ alertmanager_receiver_config_matrix_proxy }}"
+  "room-mapping": "{{ alertmanager_receiver_config_matrix_room_mapping }}"
+alertmanager_receiver_config_templating_external_url_mapping: {}
+alertmanager_receiver_config_templating_generator_url_mapping: {}
+alertmanager_receiver_config_templating_computed_values: >-2
+  {{ alertmanager_receiver_config_templating_computed_values_default }}
+alertmanager_receiver_config_templating_firing_template: >-2
+  {{ alertmanager_receiver_config_templating_firing_template_default }}
+alertmanager_receiver_config_templating_resolved_template: >-2
+  {{ alertmanager_receiver_config_templating_resolved_template_default }}
+alertmanager_receiver_config_templating:
+  "external-url-mapping": >-2
+    {{ alertmanager_receiver_config_templating_external_url_mapping }}
+  "generator-url-mapping": >-2
+    {{ alertmanager_receiver_config_templating_generator_url_mapping }}
+  "computed-values": "{{ alertmanager_receiver_config_templating_computed_values }}"
+  "firing-template": "{{ alertmanager_receiver_config_templating_firing_template }}"
+  "resolved-template": "{{ alertmanager_receiver_config_templating_resolved_template }}"
+alertmanager_receiver_default_config:
+  http: "{{ alertmanager_receiver_config_http }}"
+  matrix: "{{ alertmanager_receiver_config_matrix }}"
+  templating: "{{ alertmanager_receiver_config_templating }}"
+alertmanager_receiver_config: {}
+alertmanager_receiver_merged_config: >-2
+  {{ (alertmanager_receiver_default_config | default({})
+    | combine(alertmanager_receiver_config | default({}), recursive=True) }}

roles/alertmanager-receiver/defaults/main/main.yml

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+---
+alertmanager_receiver_user: "matrix-alertmanager-receiver"
+alertmanager_receiver_version: "2025.8.6"
+alertmanager_receiver_config_file_path: "/etc/matrix-alertmanager-receiver/config.yaml"
+alertmanager_receiver_config_path: >-2
+  {{ alertmanager_receiver_config_file_path | dirname }}
+
+alertmanager_receiver_state: present
+alertmanager_receiver_deployment_method: docker

roles/alertmanager-receiver/defaults/main/templates.yml

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+---
+alertmanager_receiver_config_templating_computed_values_default:
+  - values: # always set 'color' to 'yellow'
+      color: yellow
+  - values: # set 'color' to 'orange' when alert label 'severity' is 'warning'
+      color: orange
+    when-matching-labels:
+      severity: warning
+  - values: # set 'color' to 'red' when alert label 'severity' is 'critical'
+      color: red
+    when-matching-labels:
+      severity: critical
+  - values: # set 'color' to 'green' when alert status is 'resolved'
+      color: green
+    when-matching-status: resolved
+
+alertmanager_receiver_config_templating_firing_template_default: |+2
+  <p>
+    <strong><font color="{{ .ComputedValues.color }}">{{ .Alert.Status | ToUpper }}</font></strong>
+    {{ if .Alert.Labels.name }}
+      {{ .Alert.Labels.name }}
+    {{ else if .Alert.Labels.alertname }}
+      {{ .Alert.Labels.alertname }}
+    {{ end }}
+    >>
+    {{ if .Alert.Labels.severity }}
+      {{ .Alert.Labels.severity | ToUpper }}: 
+    {{ end }}
+    {{ if .Alert.Annotations.description }}
+      {{ .Alert.Annotations.description }}
+    {{ else if .Alert.Annotations.summary }}
+      {{ .Alert.Annotations.summary }}
+    {{ end }}
+    >>
+    {{ if .Alert.Annotations.runbook }}
+      <a href="{{ .Alert.Annotations.runbook }}">Runbook</a> | 
+    {{ end }}
+    {{ if .Alert.Annotations.dashboard }}
+      <a href="{{ .Alert.Annotations.dashboard }}">Dashboard</a> | 
+    {{ end }}
+    <a href="{{ .SilenceURL }}">Silence</a>
+  </p>
+
+alertmanager_receiver_config_templating_resolved_template_default: |+2
+  <strong>
+    <font color="{{ .ComputedValues.color }}">{{ .Alert.Status | ToUpper }}</font>
+  </strong>{{ .Alert.Labels.name }}

roles/alertmanager-receiver/tasks/check.yml

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+---
+- name: Ensure valid alertmanager_receiver_state
+  ansible.builtin.fail:
+    msg: >-2
+      Unsupported value '{{ alertmanager_receiver_state }}' for
+      alertmanager_receiver_state. Supported values are
+      {{ alertmanager_receiver_states | map(quote) | join(', ')
+  when: alertmanager_receiver_state not in alertmanager_receiver_states
+
+- name: Ensure valid alertmanager_receiver_deployment_method
+  ansible.builtin.fail:
+    msg: >-2
+      Unsupported value '{{ alertmanager_receiver_deployment_method }}' for
+      alertmanager_receiver_deployment_method. Supported values are
+      {{ alertmanager_receiver_deployment_methods | map(quote) | join(', ')
+  when: alertmanager_receiver_deployment_method not in alertmanager_receiver_deployment_methods

roles/alertmanager-receiver/tasks/configure.yml

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+---
+- name: Ensure configuration folder '{{ alertmanager_receiver_config_path }}' is {{ alertmanager_receiver_state }}
+  ansible.builtin.file:
+    path: "{{ alertmanager_receiver_config_path }}"
+    state: >-2
+      {{ (alertmanager_receiver_state == 'present') | ternary('directory', 'absent') }}
+
+- name: Ensure configuration file '{{ alertmanager_receiver_config_file_path }}' is written
+  ansible.builtin.copy:
+    dest: "{{ alertmanager_receiver_config_file_path }}"
+    content: "{{ alertmanager_receiver_merged_config | to_nice_yaml(indent=2, width=200) }}"
+  when: alertmanager_receiver_state == 'present'

roles/alertmanager-receiver/tasks/main.yml

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+---
+- name: Ensure preconditions are met
+  ansible.builtin.include_taks:
+    file: "check.yml"
+
+- name: Ensure configuration is up to date
+  ansible.builtin.include_taks:
+    file: "configure.yml"
+
+- name: Deploy using {{ alertmanager_receiver_deployment_method }}
+  ansible.builtin.include_tasks:
+    file: "deploy-{{ alertmanager_receiver_deployment_method }}.yml"

roles/alertmanager-receiver/vars/main.yml

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+---
+alertmanager_receiver_states:
+  - "present"
+  - "absent"
+alertmanager_receiver_deployment_methods:
+  - "docker"