feat: add Alertmanager web config

Author: ntk148v

ansible/roles/alertmanager/defaults/main.yml

@@ -125,6 +125,12 @@ alertmanager_route:
 # ----------------------------------
 alertmanager_env: "{{ docker_container_env}}"
 
+# Alertmanager web config https://prometheus.io/docs/alerting/latest/https/
+alertmanager_web_config:
+  tls_server_config: {}
+  http_server_config: {}
+  basic_auth_users: {}
+
 # Container constructors
 # ----------------------
 alertmanager_services:
@@ -166,12 +172,15 @@ alertmanager_services:
             alertmanager_web_listen_address is not string %}
       {%   for address in alertmanager_web_listen_address %}
         {{ pre }}-web.listen-address={{ address }}
-      {%   endfor %}
+      {% endfor %}
       {% else %}
         {{ pre }}-web.listen-address={{ alertmanager_web_listen_address }}
+      {% endif %}
+      {% if alertmanager_web_config is defined and alertmanager_version is version('0.22.0', '>=') %}
+        {{ pre }}--web.config.file=/etc/alertmanager/web.yml
       {% endif %}
         {{ pre }}-web.external-url={{ alertmanager_web_external_url }}
-      {% for flag, flag_value in alertmanager_config_flags_extra.items() %}
+      {% for flag, flag_value in alertmanager_config_flags_extra.items() %}\
         {{ pre }}-{{ flag }}={{ flag_value }}
       {% endfor %}
     log_driver: "{{ alertmanager_docker_log_driver }}"

ansible/roles/alertmanager/meta/argument_specs.yml

@@ -77,3 +77,6 @@ argument_specs:
         description: "Environment variables for alertmanager container"
         type: "dict"
         default: "{{ docker_container_env }}"
+      alertmanager_web_config:
+        description: "A Alertmanager L(web config yaml,https://prometheus.io/docs/alerting/latest/https) for configuring TLS and auth."
+        type: "dict"

ansible/roles/alertmanager/tasks/config.yml

@@ -39,6 +39,13 @@
   notify:
     - Reload alertmanager config
 
+- name: Configure Alertmanager web
+  ansible.builtin.copy:
+    content: "{{ alertmanager_web_config | to_nice_yaml(indent=2, sort_keys=False) }}"
+    dest: "{{ alertmanager_config_dir }}/web.yml"
+    force: true
+    mode: 0755
+
 - name: Copying over alertmanager config file
   vars:
     service: "{{ alertmanager_services['alertmanager'] }}"