Description of problem:
In RHOSP16.2.4, the glance_api_cron container is created regardless of whether glance's Image cache is enabled or disabled.[1]
In that case, tripleo_glance_api_cron_healthcheck.service will fail if the Image cache of the glance is not enabled.[2]
It is assumed that this may be due to the fact that cron jobs are not created in the glance_api_cron container if the glance image cache is not enabled.[3]

[1]
~~~
[root@controller-0 ~]# podman ps | grep glance
a1203af1a1b0  undercloud-0.ctlplane.redhat.local:8787/rh-osbs/rhosp16-openstack-glance-api:16.2_20221124.2                 kolla_start           12 hours ago  Up 12 hours ago          glance_api
525dfd2e9e42  undercloud-0.ctlplane.redhat.local:8787/rh-osbs/rhosp16-openstack-glance-api:16.2_20221124.2                 kolla_start           12 hours ago  Up 12 hours ago          glance_api_cron
~~~

/var/lib/config-data/puppet-generated/glance_api/etc/glance/glance-api.conf:
~~~
...
[paste_deploy]
...
flavor=keystone
...
~~~

[2]
~~~
[root@controller-0 ~]# systemctl status tripleo_glance_api_cron_healthcheck.service
● tripleo_glance_api_cron_healthcheck.service - glance_api_cron healthcheck
   Loaded: loaded (/etc/systemd/system/tripleo_glance_api_cron_healthcheck.service; disabled; vendor preset: disabled)
   Active: failed (Result: exit-code) since Tue 2023-01-10 02:23:43 UTC; 1min 10s ago
  Process: 587513 ExecStart=/usr/bin/podman exec --user root glance_api_cron /usr/share/openstack-tripleo-common/healthcheck/cron glance (code=exited, status=1/FAILURE)
 Main PID: 587513 (code=exited, status=1/FAILURE)

Jan 10 02:23:43 controller-0 systemd[1]: Starting glance_api_cron healthcheck...
Jan 10 02:23:43 controller-0 podman[587513]: 2023-01-10 02:23:43.559562442 +0000 UTC m=+0.311770303 container exec 525dfd2e9e42626c12513404df445a190bf3a777e09bb3d8de18aed18bc1325c (image=undercloud-0.ctlplane.redhat.local:8787/rh>
Jan 10 02:23:43 controller-0 systemd[1]: tripleo_glance_api_cron_healthcheck.service: Main process exited, code=exited, status=1/FAILURE
Jan 10 02:23:43 controller-0 systemd[1]: tripleo_glance_api_cron_healthcheck.service: Failed with result 'exit-code'.
Jan 10 02:23:43 controller-0 systemd[1]: Failed to start glance_api_cron healthcheck.
~~~

[3]
~~~
[root@controller-0 ~]# podman exec -it glance_api_cron crontab -l
no crontab for root
~~~

~~~
[root@controller-0 ~]# podman exec -it glance_api_cron cat /usr/share/openstack-tripleo-common/healthcheck/cron
#!/bin/bash

file="${1:-root}"
if [ -f /var/spool/cron/${file} ]; then
    nb_lines=$(grep -cEv '^#' /var/spool/cron/${file})
    if [ $nb_lines -ge 2 ]; then
        exit 0
    fi
fi
exit 1
~~~

Version-Release number of selected component (if applicable):
python3-glanceclient-2.17.1-2.20220111011432.1aba8f2.el8ost.noarch
puppet-glance-15.5.0-2.20220804175403.d54e942.el8ost.noarch


How reproducible:
This always happens when Image cache is disabled in RHOSP16.2.4.

Actual results:
tripleo_glance_api_cron_healthcheck.service fail

Expected results:
tripleo_glance_api_cron_healthcheck.service does not fail