restart policy added

docker-compose/prometheus/exporters/cadvisor/docker-compose.yml

@@ -14,4 +14,5 @@ services:
       - /var/lib/docker/:/var/lib/docker:ro
       - /dev/disk/:/dev/disk:ro
     devices:
-      - /dev/kmsg
+      - /dev/kmsg
+    restart: unless-stopped