Priority Group Nodes to mimic Cisco ACE backup pool. Need to alert on when we go to backup nodes

I believe your work around is probably the best solution as the log your looking for is likely only generated when we adjust the LTM logging for the Traffic Management OS logs under System ›› Logs : Configuration : Options : Local Traffic Logging to log informational severity logs. This will create more noise than just the priority group log and it will be applied to all virtual servers therefore it may not be the best solution.