Add prometheus exporter for postfix and option postfix.metrics_address

tasks/main.yml

@@ -3,6 +3,21 @@
     pkg:
       - postfix
 
+- name: install prometheus postfix exporter
+  apt:
+    pkg:
+    - prometheus-postfix-exporter
+
+- name: configure prometheus postfix exporter
+  template:
+    src: prometheus-postfix-exporter.j2
+    dest: /etc/default/prometheus-postfix-exporter
+    owner: root
+    group: root
+    mode: 0644
+  notify:
+  - restart prometheus-postfix-exporter
+
 - name: Install and setup utilities for LDAP
   when: postfix.ldap.enable
   block: