From 998cffe33e0834b711ce19b8d909a43a2f476084 Mon Sep 17 00:00:00 2001
From: Georg Pfuetzenreuter <mail@georg-pfuetzenreuter.net>
Date: Mar 25 2024 03:57:04 +0000
Subject: Configure Discourse monitoring


Enable Discourse metrics endpoint and configure it as a target
in Prometheus.
Public access to forums.o.o/metrics is denied as it's not clear
whether it caches or directly forwards to the Webrick based
collection service.

Signed-off-by: Georg Pfuetzenreuter <mail@georg-pfuetzenreuter.net>

---

diff --git a/pillar/cluster/atlas/services.sls b/pillar/cluster/atlas/services.sls
index b79d118..e2e94b5 100644
--- a/pillar/cluster/atlas/services.sls
+++ b/pillar/cluster/atlas/services.sls
@@ -22,6 +22,7 @@ haproxy:
         - path_matrix_client     path_beg    /.well-known/matrix/client
         - path_matrix_federation path_beg    /.well-known/matrix/server
         - path_meetings          path_beg    /meetings
+        - path_metrics           path        /metrics
         - path_openid            path_beg    -i /openid
         - path_openid            path_beg    -i /common/app/
         - path_openid            path_beg    -i /openid-ldap
@@ -127,6 +128,7 @@ haproxy:
         - matrix-federation   if path_matrix_federation
         - security_txt        if path_security
         - internal            if path_grafana_login !internal_clients
+        - internal            if host_forums path_metrics !internal_clients
 
         # path-specific rules
         - jekyll          if host_monitor path_slash
diff --git a/pillar/role/monitoring/master.sls b/pillar/role/monitoring/master.sls
index fbf3ad5..a88ecc3 100644
--- a/pillar/role/monitoring/master.sls
+++ b/pillar/role/monitoring/master.sls
@@ -106,6 +106,13 @@ prometheus:
                 physical: []
                 kvm: []
 
+            discourse:
+              port: 9405
+              roles:
+                - discourse
+              simple: true
+              targets: []
+
             elasticsearch:
               port: 9114
               roles:
diff --git a/salt/profile/discourse/init.sls b/salt/profile/discourse/init.sls
index 6970014..3d9f04b 100644
--- a/salt/profile/discourse/init.sls
+++ b/salt/profile/discourse/init.sls
@@ -1,9 +1,10 @@
 {%- from 'macros.jinja' import puma_service_dropin %}
 
-discourse_pgks:
+discourse_pkgs:
   pkg.installed:
     - pkgs:
       - discourse
+      - discourse-plugin-prometheus
       - ruby3.2-rubygem-discourse_mail_receiver
       - nginx-module-brotli
 
@@ -65,3 +66,12 @@ discourse_sidekiq_service:
   service.running:
     - name: discourse-puma
     - enable: True
+    - require:
+        - pkg: discourse_pkgs
+
+discourse_prometheus_collector:
+  service.running:
+    - name: discourse-prometheus-collector
+    - enable: True
+    - require:
+        - pkg: discourse_pkgs