In HA Pairs, the status could include something like “Standby”. Currently, if a Master is in green status, the corresponding Slave appears red. In HA the Master knows that there is a ready Slave -or viceversa- and for this reason a third yellow status could be more comprehensive, showing that there is a ready pair.
Also, this may be somewhat complex -or not- that Slave unit in standby could be reached via Remote Web admin, allowing for tasks like firmware updates and more.