Rename prometheus glusterfs volume

Change-Id: I9a2127c5344ed3b5d81767c899271d983888210f
diff --git a/docker/swarm/service/monitoring/prometheus_alertmanager.yml b/docker/swarm/service/monitoring/prometheus_alertmanager.yml
index 74b20f5..99eb226 100644
--- a/docker/swarm/service/monitoring/prometheus_alertmanager.yml
+++ b/docker/swarm/service/monitoring/prometheus_alertmanager.yml
@@ -19,5 +19,5 @@
           volume:
             site:
               type: bind
-              source: /srv/volumes/prometheus-config
+              source: /srv/volumes/prometheus
               destination: /opt/alertmanager/config
diff --git a/docker/swarm/service/monitoring/prometheus_server.yml b/docker/swarm/service/monitoring/prometheus_server.yml
index 24a9193..94207ca 100644
--- a/docker/swarm/service/monitoring/prometheus_server.yml
+++ b/docker/swarm/service/monitoring/prometheus_server.yml
@@ -25,5 +25,5 @@
           volume:
             site:
               type: bind
-              source: /srv/volumes/prometheus-config
+              source: /srv/volumes/prometheus
               destination: /opt/prometheus/config