add container number to node exporter

network/node-exporter-update-public-ip.sh

@@ -2,7 +2,7 @@
 
 OUT=/docker/monitoring/node_exporter/textfile_collector/custom.prom
 TS=$(date +%s%3N)
-
+DOCKER_CONTAINER_NUM=44
 {
     # Docker container states
     docker ps -a --format '{{.Names}}' | while read -r name; do
@@ -13,6 +13,8 @@ TS=$(date +%s%3N)
         fi
     done
 
+    echo docker_container_number $DOCKER_CONTAINER_NUM
+
     # Public IP information
     IP_JSON=$(curl -fsSL http://ip-api.com/json)