Update docker.io/library/postgres Docker tag to v15

resources/chaosknoten/grafana/docker_compose/prometheus.yml

@@ -44,6 +44,15 @@ scrape_configs:
           - mumble.hamburg.ccc.de:443
         labels:
           org: ccchh
+  - job_name: opnsense-ccchh
+    honor_timestamps: true
+    metrics_path: /metrics
+    scheme: http
+    static_configs:
+      - targets:
+          - 185.161.129.132:9100
+        labels:
+          org: ccchh
   - job_name: jitsi
     honor_timestamps: true
     scrape_interval: 5s