fixing Grafana composer

Change-Id: Ice20e43db75e6a4f5514c894c8531e314288902d
Signed-off-by: lavado <glavado@whitestack.com>
diff --git a/installers/docker/osm_metrics/docker-compose.yml b/installers/docker/osm_metrics/docker-compose.yml
index fb0e835..98fd565 100644
--- a/installers/docker/osm_metrics/docker-compose.yml
+++ b/installers/docker/osm_metrics/docker-compose.yml
@@ -2,7 +2,7 @@
 networks:
   netOSM:
     external:
-       name: ${OSM_NETWORK:-netOSM}
+       name: ${OSM_NETWORK:-netosm}
 services:
   grafana:
     image: grafana/grafana