Adjust stacklight influxdb retention

Change-Id: I560bf41b56e4d2dd51f1b04435c040d4d2f20657
diff --git a/docker/swarm/stack/monitoring/init.yml b/docker/swarm/stack/monitoring/init.yml
index 97b9ac3..347319a 100644
--- a/docker/swarm/stack/monitoring/init.yml
+++ b/docker/swarm/stack/monitoring/init.yml
@@ -32,6 +32,7 @@
               environment:
                 bind_port: ${prometheus:remote_storage_adapter:bind:port}
                 bind_address: ${prometheus:remote_storage_adapter:bind:address}
+                influxdb_retention_policy: 'lma'
                 influxdb_url: ${_param:prometheus_influxdb_url}
                 influxdb_db: ${_param:prometheus_influxdb_db}
                 influxdb_username: ${_param:prometheus_influxdb_username}