If you are not familiar with GroupWise Monitor, review GroupWise Monitor Overview
in Installing GroupWise Monitor
in the GroupWise 2012 Installation Guide.
As you plan Monitor in a clustering environment, you must keep in mind that you will plan and set up two Monitor components:
Monitor Agent (gwmon) that will be associated with a domain in your GroupWise system
Monitor Application (a Java servlet) that will be added to your Web server (Apache). You must install the Monitor Application on a non-clustered Web server.
You install the Monitor Agent on each node in the cluster. You install the Monitor Application to your Web server, which must not be clustered. This means that the Monitor Agent Web console at the following URL is always available, because it is part of the cluster:
http://secondary_IP_address:8200
However, the Monitor Web console at the following URL is not available if the Web server is down:
http://Web_server_address/gwmon/gwmonitor