[prometheus-postfix-exporter] Deploy new prometheus exporter

group_vars/postfix.yml

@@ -0,0 +1,3 @@
+---
+glob_prometheus_postfix_exporter:
+  listen_addr: "{{ query('ldap', 'ip4', ansible_hostname, 'adm') }}"

plays/monitoring.yml

@@ -55,9 +55,12 @@
   roles:
     - prometheus-bird-exporter
 
-# Monitor mailq with a special text exporter
-# - hosts: redisdead.adm.crans.org
-#   roles: ["prometheus-node-exporter-postfix"]
+# Monitor postfix queue
+- hosts: postfix, !sputnik.adm.crans.org
+  vars:
+    prometheus_postfix_exporter: "{{ glob_prometheus_postfix_exporter | default({}) | combine(loc_prometheus_postfix_exporter | default({})) }}"
+  roles:
+    - prometheus-postfix-exporter
 
 # Monitor logs with mtail
 - hosts: mtail

roles/prometheus-node-exporter-postfix/files/postfix.sh

@@ -1,11 +0,0 @@
-#!/bin/bash
-#
-# Description: Expose metrics from postfix.
-#
-# Author: Alexandre Iooss <erdnaxe@crans.org>
-
-mailq_length="$(/usr/bin/mailq | grep "[^ ]*@crans.org" | wc -l)"
-
-echo '# HELP postfix_mailq_length Pending mails in mailq.'
-echo '# TYPE postfix_mailq_length gauge'
-echo "postfix_mailq_length ${mailq_length}"

roles/prometheus-node-exporter-postfix/files/prometheus-node-exporter-postfix.service

@@ -1,6 +0,0 @@
-[Unit]
-Description=Collect postfix metrics for prometheus-node-exporter
-
-[Service]
-Type=oneshot
-ExecStart=/bin/bash -c "/usr/share/prometheus-node-exporter/postfix.sh | sponge /var/lib/prometheus/node-exporter/postfix.prom"

roles/prometheus-node-exporter-postfix/files/prometheus-node-exporter-postfix.timer

@@ -1,9 +0,0 @@
-[Unit]
-Description=Run postfix metrics collection every 15 minutes
-
-[Timer]
-OnBootSec=0
-OnUnitActiveSec=15min
-
-[Install]
-WantedBy=timers.target

roles/prometheus-node-exporter-postfix/tasks/main.yml

@@ -1,25 +0,0 @@
----
-# Install Postfix textfile collector, in bullseye you will have postfix exporter
-- name: Install Postfix textfile collector
-  copy:
-    src: "{{ item.src }}"
-    dest: "{{ item.dest }}"
-    owner: root
-    group: root
-    mode: "{{ item.mode }}"
-  loop:
-    - src: postfix.sh
-      dest: /usr/share/prometheus-node-exporter/postfix.sh
-      mode: "0755"
-    - src: prometheus-node-exporter-postfix.service
-      dest: /etc/systemd/system/prometheus-node-exporter-postfix.service
-      mode: "0644"
-    - src: prometheus-node-exporter-postfix.timer
-      dest: /etc/systemd/system/prometheus-node-exporter-postfix.timer
-      mode: "0644"
-
-- name: Activate prometheus-node-exporter-postfix timer
-  systemd:
-    name: prometheus-node-exporter-postfix.timer
-    enabled: true
-    state: started

roles/prometheus-postfix-exporter/handlers/main.yml

@@ -0,0 +1,5 @@
+---
+- name: systemctl restart prometheus-postfix-exporter.service
+  service:
+    name: prometheus-postfix-exporter
+    state: restarted

roles/prometheus-postfix-exporter/tasks/main.yml

@@ -0,0 +1,22 @@
+---
+- name: apt install prometheus-postfix-exporter
+  apt:
+    update_cache: true
+    name: prometheus-postfix-exporter
+    install_recommends: false
+  register: apt_result
+  retries: 3
+  until: apt_result is succeeded
+
+- name: edit /etc/default/prometheus-postfix-exporter
+  lineinfile:
+    path: /etc/default/prometheus-postfix-exporter
+    regexp: ^ARGS=
+    line: |
+      ARGS="--web.listen-address={{ prometheus_postfix_exporter.listen_addr }}:9154"
+  notify: systemctl restart prometheus-postfix-exporter.service
+
+- name: rotate /var/lib/prometheus/postfix-exporter/
+  template:
+    src: logrotate.d/prometheus-postfix-exporter.j2
+    dest: /etc/logrotate.d/prometheus-postfix-exporter

roles/prometheus-postfix-exporter/templates/logrotate.d/prometheus-postfix-exporter.j2

@@ -0,0 +1,11 @@
+/var/lib/prometheus/postfix-exporter/mail.log {
+	weekly
+	rotate 2
+	copytruncate
+	notifempty
+	missingok
+	create 0640 prometheus prometheus
+	postrotate
+		/usr/lib/rsyslog/rsyslog-rotate
+	endscript
+}