During deployment customer faces:

~~~
ERROR:tripleo-export-ceph:Error exporting ceph data, skipping ceph data export
Traceback (most recent call last):
  File "/usr/local/bin/tripleo-export-ceph", line 80, in export_ceph_data
    ceph_data = ceph_export_func(stackname, cephx, playbooks_dir)
  File "/usr/local/bin/tripleo-export-ceph", line 20, in export_cephadm
    cluster = ceph_data['tripleo_ceph_client_cluster']
KeyError: 'tripleo_ceph_client_cluster'
I0731 19:24:20.689885       1 deploy.go:237] Running process Overcloud JSON.
I0731 19:24:20.854463       1 deploy.go:471] Shutting down deploy agent
~~~

Even though no Ansible task fails.
We tried adding "CephClusterName" or "tripleo_ceph_client_cluster" parameters set to "ceph" to ceph-ansible-external.yaml but the only way to avoid the issue the customer found was adding "tripleo_ceph_client_cluster: ceph" to "tripleo-ansible/external_deploy_steps_tasks_step2.yaml".

Customer is using latest images available today and we confirmed tripleo-export-ceph has the patch merged from OSPK8-753.