prometheus: Enable collection of traefik metrics

.env.sample

@@ -5,6 +5,10 @@ PROMETHEUS_DOMAIN=prometheus.example.com
 
 LETS_ENCRYPT_ENV=production
 
+# Edit this in order to allow collection of traefik metrics
+#TRAEFIK_METRICS_ENABLED=1
+#TRAEFIK_SERVICE_NAME=traefik_app
+
 # grafana SMTP configuration (optional)
 #GF_SMTP_HOST=changeme
 #GF_SMTP_ENABLED=1

abra.sh

@@ -1,4 +1,4 @@
-export PROMETHEUS_YML_VERSION=v1
+export PROMETHEUS_YML_VERSION=v2
 export PROMTAIL_YML_VERSION=v1
 export LOKI_YML_VERSION=v1
 export NODE_EXPORTER_ENTRYPOINT_VERSION=v1

compose.yml

@@ -145,8 +145,9 @@ services:
 
 configs:
   prometheus_yml:
+    template_driver: golang
     name: ${STACK_NAME}_prometheus_yml_${PROMETHEUS_YML_VERSION}
-    file: prometheus.yml
+    file: prometheus.yml.tmpl
   promtail_yml:
     name: ${STACK_NAME}_promtail_yml_${PROMTAIL_YML_VERSION}
     file: promtail.yml

prometheus.yml.tmpl

@@ -46,11 +46,13 @@ scrape_configs:
       type: 'A'
       port: 8080
 
+{{ if eq (env "TRAEFIK_METRICS_ENABLED") "1" }}
   - job_name: 'traefik'
     scrape_interval: 30s
     metrics_path: '/metrics'
     dns_sd_configs:
     - names:
-      - 'tasks.traefik_app'
+      - 'tasks.{{ (env "TRAEFIK_SERVICE_NAME") }}'
       type: 'A'
       port: 8082
+{{ end }}