Not sure how this inventory group is generated, but the fix for this is to comment out the metering-alarm_all section in the haproxy variables file
diff --git a/playbooks/vars/configs/haproxy_config.yml b/playbooks/vars/configs/haproxy_config.yml
index 6687ff3..e8c8655 100644
--- a/playbooks/vars/configs/haproxy_config.yml
+++ b/playbooks/vars/configs/haproxy_config.yml
@@ -180,8 +180,8 @@ haproxy_service_configs:
haproxy_backend_nodes: "{{ groups['ceilometer_api_container'] }}"
haproxy_port: 8777
haproxy_balance_type: http
- - service:
- haproxy_service_name: aodh_api
- haproxy_backend_nodes: "{{ groups['metering-alarm_all'] }}"
- haproxy_port: 8042
- haproxy_balance_type: http
+# - service:
+# haproxy_service_name: aodh_api
+# haproxy_backend_nodes: "{{ groups['metering-alarm_all'] }}"
+# haproxy_port: 8042
+# haproxy_balance_type: http
(END)