Moved to Web Gateway for a faster response.
the folder you mention is reserved for "user-defined-logs", e.g. log files which are written from the rule engine.
You may want to look at
which contains the log files of all MWG services and includes error messages as well as status information, especially when a process was started.
The operating system uses default syslog capabilties and writes all logs to
especially /var/log/syslog, /var/log/messages and /var/log/daemon (not all log files may exist).
I have checked the logs /opt/mwg/log/mwg-errors but there is no log which tells that server is rebooted or system is going down.
Can u please exactly tell us the log which gives these information regarding reboot
Keep in mind that it is a linux OS. This command will show reboots and shutdowns:
Information is logged in /var/log/messages