From fc5aa70d2701b03ea155018239bf33c3382c35df Mon Sep 17 00:00:00 2001
From: mirsal <mirsal@mirsal.fr>
Date: Mon, 9 Aug 2021 23:28:15 +0000
Subject: [PATCH] Allow prometheus metrics collection

This patch adds a METRICS_ENABLED configuration variables which,
when switched on, defines a metrics entrypoint and enables the
built-in prometheus metrics exporter. This allows the monitoring
stack to collect and show traefik metrics
---
 .env.sample      |  8 ++++++++
 abra.sh          |  2 +-
 traefik.yml.tmpl | 10 ++++++++++
 3 files changed, 19 insertions(+), 1 deletion(-)

diff --git a/.env.sample b/.env.sample
index e4b9981..1e19c25 100644
--- a/.env.sample
+++ b/.env.sample
@@ -53,6 +53,14 @@ COMPOSE_FILE="compose.yml"
 #COMPOSE_FILE="$COMPOSE_FILE:compose.keycloak.yml"
 #KEYCLOAK_MIDDLEWARE_ENABLED=1
 
+#####################################################################
+# Prometheus metrics                                                #
+#####################################################################
+
+## Enable prometheus metrics collection
+## used used by the coop-cloud monitoring stack
+#METRICS_ENABLED=1
+
 #####################################################################
 # Additional services                                               #
 #####################################################################
diff --git a/abra.sh b/abra.sh
index b38710a..4c03f07 100644
--- a/abra.sh
+++ b/abra.sh
@@ -1,3 +1,3 @@
-export TRAEFIK_YML_VERSION=v11
+export TRAEFIK_YML_VERSION=v12
 export FILE_PROVIDER_YML_VERSION=v2
 export ENTRYPOINT_VERSION=v2
diff --git a/traefik.yml.tmpl b/traefik.yml.tmpl
index 99a436e..bd30603 100644
--- a/traefik.yml.tmpl
+++ b/traefik.yml.tmpl
@@ -54,10 +54,20 @@ entrypoints:
   mumble-udp:
     address: ":64738/udp"
   {{ end }}
+  {{ if eq (env "METRICS_ENABLED") "1" }}
+  metrics:
+    address: ":8082"
+  {{ end }}
 
 ping:
   entryPoint: web
 
+{{ if eq (env "METRICS_ENABLED") "1" }}
+metrics:
+  prometheus:
+    entryPoint: metrics
+{{ end }}
+
 certificatesResolvers:
   staging:
     acme: