MOON
Server: Apache
System: Linux cl1170g 4.19.62-mod-std-ipv6-64-rescue #828825 SMP Tue Jul 30 13:54:49 UTC 2019 x86_64
User: wh0f20bb (1057)
PHP: 5.6.40
Disabled: NONE
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File: //proc/thread-self/root/root/webmin-1.740/mon/README
Readme file of webmin module for Mon 
created on 10th Sept 2001 

TO install..
Untar the file from / directory with root previliages.
Add this module in the webmin-user module access list
You can add entry"mon" in /etc/webmin/webmin.acl or use webmin to append user module access list.