I figured out. Its this one that breaks your site: Checkmk Exchange
2024-03-21 14:34:14 - Updating site 'cre' from version 2.2.0p23.cre to 2.3.0b3.cre...
* Installed dir local/lib/python3/cmk_addons
* Installed dir local/lib/python3/cmk_addons/plugins
* Installed dir local/lib/python3/cmk/plugins
* Updated etc/mk-livestatus/nagios.cfg
* Updated etc/nagios/conf.d/check_mk_templates.cfg
* Updated etc/init.d/agent-receiver
* Updated etc/ssl/openssl.cnf
* Updated etc/ssl/openssl.cnf.dist
* Updated etc/ssl/misc/tsget.pl
* Updated etc/ssl/misc/CA.pl
* Updated etc/ssl/misc/tsget
* Updated etc/nagvis/apache.conf
* Updated etc/check_mk/apache.conf
* Installed file etc/logrotate.d/audit
* Installed file etc/logrotate.d/security
* Vanished etc/cron.d/cmk_discovery
Creating temporary filesystem /omd/sites/cre/tmp...OK
Traceback (most recent call last):
File "/omd/sites/cre/bin/cmk-update-config", line 8, in <module>
from cmk.update_config.main import ensure_site_is_stopped, main
File "/omd/sites/cre/lib/python3/cmk/update_config/main.py", line 36, in <module>
from cmk.gui import main_modules
File "/omd/sites/cre/lib/python3/cmk/gui/main_modules.py", line 44, in <module>
import cmk.gui.cee.registration # pylint: disable=no-name-in-module,cmk-module-layer-violation
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
ModuleNotFoundError: No module named 'cmk.gui.cee.registration'
OMD[cre]:~/local/lib/python3/cmk/gui$ find
.
./cee
./cee/plugins
./cee/plugins/wato
./cee/plugins/wato/agent_bakery
./cee/plugins/wato/agent_bakery/access_logs.py
./plugins
./plugins/views
./plugins/dashboard
OMD[cre]:~/local/lib/python3/cmk/gui$