add blackbox-exporter, loki/promtail configs; fix prometheus: host network for WG access

docker-compose.yml

@@ -14,10 +14,7 @@ services:
       - '--config.file=/etc/prometheus/prometheus.yml'
       - '--storage.tsdb.retention.time=30d'
       - '--storage.tsdb.path=/prometheus'
-    ports:
-      - "9090:9090"
-    networks:
-      - monitoring
+    network_mode: host
 
   grafana:
     image: grafana/grafana:11.1.0
@@ -65,6 +62,15 @@ services:
     networks:
       - monitoring
 
+  blackbox-exporter:
+    image: prom/blackbox-exporter:v0.25.0
+    container_name: blackbox-exporter
+    restart: unless-stopped
+    command: --config.file=/etc/blackbox/blackbox.yml
+    volumes:
+      - ./blackbox.yml:/etc/blackbox/blackbox.yml:ro
+    network_mode: host
+
 networks:
   monitoring:
     driver: bridge