Currently installing HA and discussing the issue with 3 IP's to be included in the ACL of the devices polled. OK we have to live with this.
NOW let's get into something interesting.
How to change the OS (upgrade) when you have a HA installation?
Two servers running W 2012 and moving to 2016 without downtime or minimum downtime.
How are we going to do this?
According to me this is one of the reasons to have HA in a critical monitoring environment.