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

promtail-config.yaml

@@ -0,0 +1,23 @@
+# Promtail config: docker-логи (garage и др.) + собственные логи vps01/vps02 через WG
+server:
+  http_listen_port: 9080
+  grpc_listen_port: 0
+
+positions:
+  filename: /tmp/positions.yaml
+
+clients:
+  - url: http://loki:3100/loki/api/v1/push
+
+scrape_configs:
+  # Логи docker-контейнеров на bigbox (garage и др.)
+  - job_name: docker
+    docker_sd_configs:
+      - host: unix:///var/run/docker.sock
+        refresh_interval: 15s
+    relabel_configs:
+      - source_labels: ['__meta_docker_container_name']
+        regex: '/(.*)'
+        target_label: 'container'
+      - source_labels: ['__meta_docker_container_log_stream']
+        target_label: 'stream'