From bb8dea1d871c2152aad002536000122440402f1c Mon Sep 17 00:00:00 2001
From: Yohann D'ANELLO <ynerant@crans.org>
Date: Tue, 9 Aug 2022 16:03:08 +0200
Subject: [PATCH] [postfix] Add Prometheus exporter

Signed-off-by: Yohann D'ANELLO <ynerant@crans.org>
---
 host_vars/fyre.adm.crans.org.yml                 | 15 +++++++++++++++
 plays/monitoring.yml                             |  7 +++++++
 .../handlers/main.yml                            |  5 +++++
 roles/prometheus-postfix-exporter/tasks/main.yml | 16 ++++++++++++++++
 4 files changed, 43 insertions(+)
 create mode 100644 roles/prometheus-postfix-exporter/handlers/main.yml
 create mode 100644 roles/prometheus-postfix-exporter/tasks/main.yml

diff --git a/host_vars/fyre.adm.crans.org.yml b/host_vars/fyre.adm.crans.org.yml
index d0fe3278..df5ea2d2 100644
--- a/host_vars/fyre.adm.crans.org.yml
+++ b/host_vars/fyre.adm.crans.org.yml
@@ -119,6 +119,21 @@ loc_prometheus:
             target_label: __address__
             replacement: '$1:9119'
 
+  postfix:
+    config:
+      - job_name: postfix
+        file_sd_configs:
+          - files:
+              - '/etc/prometheus/targets/postfix.json'
+        relabel_configs:
+          - source_labels: [__address__]
+            target_label: __param_target
+          - source_labels: [__param_target]
+            target_label: instance
+          - source_labels: [__param_target]
+            target_label: __address__
+            replacement: '$1:9154'
+
   mtail:
     config:
       - job_name: mtail
diff --git a/plays/monitoring.yml b/plays/monitoring.yml
index 973a66cf..152cc79e 100755
--- a/plays/monitoring.yml
+++ b/plays/monitoring.yml
@@ -62,6 +62,13 @@
   roles:
     - prometheus-bind-exporter
 
+# Monitor Postfix metrics
+- hosts: postfix
+  vars:
+    prometheus_postfix_exporter: "{{ glob_prometheus_postfix_exporter | default({}) | combine(loc_prometheus_postfix_exporter | default({})) }}"
+  roles:
+    - prometheus-postfix-exporter
+
 # Monitor mailq with a special text exporter
 # - hosts: redisdead.adm.crans.org
 #   roles: ["prometheus-node-exporter-postfix"]
diff --git a/roles/prometheus-postfix-exporter/handlers/main.yml b/roles/prometheus-postfix-exporter/handlers/main.yml
new file mode 100644
index 00000000..cb53af4a
--- /dev/null
+++ b/roles/prometheus-postfix-exporter/handlers/main.yml
@@ -0,0 +1,5 @@
+---
+- name: Restart prometheus-postfix-exporter
+  service:
+    name: prometheus-postfix-exporter
+    state: restarted
diff --git a/roles/prometheus-postfix-exporter/tasks/main.yml b/roles/prometheus-postfix-exporter/tasks/main.yml
new file mode 100644
index 00000000..5fb03c42
--- /dev/null
+++ b/roles/prometheus-postfix-exporter/tasks/main.yml
@@ -0,0 +1,16 @@
+---
+- name: Install Prometheus postfix-exporter
+  apt:
+    update_cache: true
+    name: prometheus-postfix-exporter
+  register: apt_result
+  retries: 3
+  until: apt_result is succeeded
+
+- name: Make Prometheus postfix-exporter listen on adm only
+  lineinfile:
+    path: /etc/default/prometheus-postfix-exporter
+    regexp: ^ARGS=
+    line: |
+      ARGS="--web.listen-address={{ prometheus_postfix_exporter.listen_addr }}:9154"
+  notify: Restart prometheus-postfix-exporter