config(docker_compose): add diun metrics to prometheus and grafana

docker_compose/mediahost/diun/docker-compose.yaml

@@ -17,6 +17,11 @@ services:
       DIUN_PROVIDERS_DOCKER: "true"
       DIUN_PROVIDERS_DOCKER_WATCHBYDEFAULT: "true"
       
+      # Metrics
+      
+      DIUN_METRICS_ENABLED: "true"
+      DIUN_METRICS_ADDR: ":9090"
+      DIUN_METRICS_TOKEN: "Qj#8C!@Uz3uRWm@mCd@KH6Bo7nfQ4K"
       # Email notifications
       DIUN_NOTIF_MAIL_HOST: smtp.web.de
       DIUN_NOTIF_MAIL_PORT: 587
@@ -30,4 +35,9 @@ services:
       options:
         max-size: "10m"
         max-file: "3"
+    networks:
+      - shared-prometheus-services
+networks:
+  shared-prometheus-services:
+    external: true