unit remains in 'Incomplete relations: identity' although related to keystone and the entire model has settled

Happened right after initial deployment of charm-keystone's zaza bundle for xenial-mitaka:

https://review.opendev.org/#/c/744690/
https://openstack-ci-reports.ubuntu.com/artifacts/test_charm_pipeline_func_full/openstack/charm-keystone/744690/5/6746/index.html

2020-09-01 21:12:05 DEBUG juju-log Generating template context for amqp
2020-09-01 21:12:05 DEBUG juju-log Generating template context for identity-service
2020-09-01 21:12:06 INFO juju-log Missing required data: service_port admin_tenant_name service_host auth_port admin_password auth_host admin_user
2020-09-01 21:12:06 INFO juju-log Missing required data: service_port admin_tenant_name service_host auth_port admin_password auth_host admin_user
2020-09-01 21:12:07 INFO juju-log Missing required data: service_port admin_tenant_name service_host auth_port admin_password auth_host admin_user
2020-09-01 21:12:07 DEBUG update-status none
2020-09-01 21:12:07 DEBUG juju-log 0 section(s) found
2020-09-01 21:12:07 DEBUG juju-log Generating template context for identity-service
2020-09-01 21:12:08 INFO juju-log Missing required data: service_port admin_tenant_name service_host auth_port admin_password auth_host admin_user
2020-09-01 21:12:08 INFO juju-log Missing required data: service_port admin_tenant_name service_host auth_port admin_password auth_host admin_user
2020-09-01 21:12:08 INFO juju-log Missing required data: service_port admin_tenant_name service_host auth_port admin_password auth_host admin_user
2020-09-01 21:12:08 DEBUG update-status none
2020-09-01 21:12:08 DEBUG juju-log Generating template context for identity-service
2020-09-01 21:12:09 INFO juju-log Missing required data: service_port admin_tenant_name service_host auth_port admin_password auth_host admin_user
2020-09-01 21:12:09 INFO juju-log Missing required data: service_port admin_tenant_name service_host auth_port admin_password auth_host admin_user
2020-09-01 21:12:09 INFO juju-log Missing required data: service_port admin_tenant_name service_host auth_port admin_password auth_host admin_user
2020-09-01 21:12:09 INFO juju-log identity relation's interface, identity-service, is related awaiting the following data from the relationship: service_port, admin_tenant_name, service_host, auth_port, admin_password, auth_host, admin_user.