fixed formatting of the node-exporter command and changed the network to host as recommend by docs

docker-compose.yml

@@ -7,6 +7,7 @@ volumes:
 networks:
   front-tier:
   back-tier:
+  host:
 
 services:
   prometheus:
@@ -42,11 +43,15 @@ services:
       - /proc:/host/proc:ro
       - /sys:/host/sys:ro
       - /:/rootfs:ro
-    command: '--path.procfs=/host/proc --path.sysfs=/host/sys --collector.filesystem.ignored-mount-points="^(/rootfs|/host|)/(sys|proc|dev|host|etc)($$|/)" --collector.filesystem.ignored-fs-types="^(sys|proc|auto|cgroup|devpts|ns|au|fuse\.lxc|mqueue)(fs|)$$"'
+    command: 
+      - '--path.procfs=/host/proc' 
+      - '--path.sysfs=/host/sys'
+      - '--collector.filesystem.ignored-mount-points="^(/rootfs|/host|)/(sys|proc|dev|host|etc)($$|/)"'
+      - '--collector.filesystem.ignored-fs-types="^(sys|proc|auto|cgroup|devpts|ns|au|fuse\.lxc|mqueue)(fs|)$$"'
     expose:
       - 9100
     networks:
-      - back-tier
+      - host
     restart: always
     deploy:
       mode: global