rsyslog stop logging without any error

Issue

• The rsyslog is running but stops logging to log files under /var/log.
• logger command exit code is 0 but no log output.
• There is nothing wrong found in strace.

# systemctl status rsyslog
● rsyslog.service - System Logging Service
   Loaded: loaded (/usr/lib/systemd/system/rsyslog.service; enabled; vendor preset: enabled)
   Active: active (running) since Fri 2020-03-20 03:14:39 EDT; 3min 59s ago
     Docs: man:rsyslogd(8)
           http://www.rsyslog.com/doc/
 Main PID: 8479 (rsyslogd)
   CGroup: /system.slice/rsyslog.service
           └─8479 /usr/sbin/rsyslogd -n

Mar 20 03:14:39 vm76 systemd[1]: Stopped System Logging Service.
Mar 20 03:14:39 vm76 systemd[1]: Starting System Logging Service...
Mar 20 03:14:39 vm76 systemd[1]: Started System Logging Service.
# logger test ; tail -1 /var/log/messages
Mar 20 03:07:46 vm76 systemd-logind: New session 100 of user root.
[root@vm76 backup]# logger test1
[root@vm76 backup]# echo $?
0
[root@vm76 backup]# tail -1 /var/log/messages
Mar 20 03:07:46 vm76 systemd-logind: New session 100 of user root.

• The systemd journal doesn't stop logging.