enhancement(alertmanager): allows using multiple web listen addresses

Signed-off-by: Christian Krause <christian.krause@idiv.de>

roles/alertmanager/molecule/alternative/molecule.yml

@@ -6,7 +6,9 @@ provisioner:
         alertmanager_binary_local_dir: '/tmp/alertmanager-linux-amd64'
         alertmanager_config_dir: /opt/am/etc
         alertmanager_db_dir: /opt/am/lib
-        alertmanager_web_listen_address: '127.0.0.1:9093'
+        alertmanager_web_listen_address:
+          - '127.0.0.1:9093'
+          - '127.0.1.1:9093'
         alertmanager_web_external_url: 'http://localhost:9093/alertmanager'
         alertmanager_resolve_timeout: 10m
         alertmanager_slack_api_url: "http://example.com"

roles/alertmanager/molecule/alternative/tests/test_alternative.py

@@ -47,6 +47,7 @@ def test_service(host):
 
 @pytest.mark.parametrize("sockets", [
     "tcp://127.0.0.1:9093",
+    "tcp://127.0.1.1:9093",
     "tcp://127.0.0.1:6783"
 ])
 def test_socket(host, sockets):

roles/alertmanager/templates/alertmanager.service.j2

@@ -33,7 +33,16 @@ ExecStart={{ _alertmanager_binary_install_dir }}/alertmanager \
 {% endfor %}
   {{ pre }}-config.file={{ alertmanager_config_dir }}/alertmanager.yml \
   {{ pre }}-storage.path={{ alertmanager_db_dir }} \
+{% if alertmanager_version is version('0.25.0', '>=') and
+      alertmanager_web_listen_address is iterable and
+      alertmanager_web_listen_address is not mapping and
+      alertmanager_web_listen_address is not string %}
+{%   for address in alertmanager_web_listen_address %}
+  {{ pre }}-web.listen-address={{ address }} \
+{%   endfor %}
+{% else %}
   {{ pre }}-web.listen-address={{ alertmanager_web_listen_address }} \
+{% endif %}
   {{ pre }}-web.external-url={{ alertmanager_web_external_url }}{% for flag, flag_value in alertmanager_config_flags_extra.items() %} \
   {{ pre }}-{{ flag }}={{ flag_value }}{% endfor %}