overcloud deployment fails with error message `Could not find data item ceph::profile::params::client_keys` in Red Hat OpenStack Platform 10

Issue

The overcloud deployment fails with error message Error: Could not find data item ceph::profile::params::client_keys in any Hiera data file

From heat deployment-show <resource UUID>:

"deploy_stderr": "exception: connect failed\n\u001b[1;31mWarning: Scope(Class[Nova]): Could not look up qualified variable '::nova::scheduler::filter::cpu_allocation_ratio'; class ::nova::scheduler::filter has not been evaluated\u001b[0m\n\u001b[1;31mWarning: Scope(Class[Nova]): Could not look up qualified variable '::nova::scheduler::filter::ram_allocation_ratio'; class ::nova::scheduler::filter has not been evaluated\u001b[0m\n\u001b[1;31mWarning: Scope(Class[Nova]): Could not look up qualified variable '::nova::scheduler::filter::disk_allocation_ratio'; class ::nova::scheduler::filter has not been evaluated\u001b[0m\n\u001b[1;31mWarning: Scope(Class[Nova::Compute]): compute_manager is marked as deprecated in Nova but still needed when Ironic is used. It will be removed once Nova removes it.\u001b[0m\n\u001b[1;31mWarning: Scope(Class[Nova::Vncproxy::Common]): Could not look up qualified variable '::nova::vncproxy::host'; class ::nova::vncproxy has not been evaluated\u001b[0m\n\u001b[1;31mWarning: Scope(Class[Nova::Vncproxy::Common]): Could not look up qualified variable '::nova::vncproxy::vncproxy_protocol'; class ::nova::vncproxy has not been evaluated\u001b[0m\n\u001b[1;31mWarning: Scope(Class[Nova::Vncproxy::Common]): Could not look up qualified variable '::nova::vncproxy::port'; class ::nova::vncproxy has not been evaluated\u001b[0m\n\u001b[1;31mWarning: Scope(Class[Nova::Vncproxy::Common]): Could not look up qualified variable '::nova::vncproxy::vncproxy_path'; class ::nova::vncproxy has not been evaluated\u001b[0m\n\u001b[1;31mError: Could not find data item ceph::profile::params::client_keys in any Hiera data file and no default supplied at /etc/puppet/modules/tripleo/manifests/profile/base/nova/compute/libvirt.pp:36 on node bmitakaoc-compute-0.localdomain\u001b[0m\n\u001b[1;31mError: Could not find data item ceph::profile::params::client_keys in any Hiera data file and no default supplied at /etc/puppet/modules/tripleo/manifests/profile/base/nova/compute/libvirt.pp:36 on node bmitakaoc-compute-0.localdomain\u001b[0m\n", 

The templates are derived from older templates (OSP 7 / 8 / 9).