During my boot on Debian 12 with Zammad 6.3.1 I can see following messages in journald:
Jul 19 01:26:41 support systemd[1]: /etc/systemd/system/zammad-worker-1.service:10: Standard output type syslog is obsolete, automatically updating to journal. Please update your unit file, and consider removing the setting altogether.
Jul 19 01:26:41 support systemd[1]: /etc/systemd/system/zammad-worker-1.service:11: Standard output type syslog is obsolete, automatically updating to journal. Please update your unit file, and consider removing the setting altogether.
Jul 19 01:26:41 support systemd[1]: /etc/systemd/system/zammad-websocket-1.service:10: Standard output type syslog is obsolete, automatically updating to journal. Please update your unit file, and consider removing the setting altogether.
Jul 19 01:26:41 support systemd[1]: /etc/systemd/system/zammad-websocket-1.service:11: Standard output type syslog is obsolete, automatically updating to journal. Please update your unit file, and consider removing the setting altogether.
Jul 19 01:26:41 support systemd[1]: /etc/systemd/system/zammad-web-1.service:10: Standard output type syslog is obsolete, automatically updating to journal. Please update your unit file, and consider removing the setting altogether.
Jul 19 01:26:41 support systemd[1]: /etc/systemd/system/zammad-web-1.service:11: Standard output type syslog is obsolete, automatically updating to journal. Please update your unit file, and consider removing the setting altogether.
After a short look to those unit files, I can see old and obsolete entries:
StandardOutput=syslog
StandardError=syslog
Those entries should be removed. Nowadays all systems should support journald.
Thank Sven