diff --git a/puppet/zulip_ops/manifests/app_frontend_monitoring.pp b/puppet/zulip_ops/manifests/app_frontend_monitoring.pp
index a013c7dafc..3a99af152a 100644
--- a/puppet/zulip_ops/manifests/app_frontend_monitoring.pp
+++ b/puppet/zulip_ops/manifests/app_frontend_monitoring.pp
@@ -3,6 +3,7 @@
 class zulip_ops::app_frontend_monitoring {
   include zulip_ops::prometheus::rabbitmq
   include zulip_ops::prometheus::uwsgi
+  zulip_ops::firewall_allow { 'grok_exporter': port => '9144' }
   include zulip_ops::munin_node
   $munin_plugins = [
     'rabbitmq_connections',