Discover Standby APIC Controllers in ACI Fabric Topology

NetBrain's ACI discovery process currently identifies active APIC controllers within a fabric but does not detect or display standby APIC controllers in the network tree, even when a fabric spans multiple pods with a designated standby node. This enhancement would extend SDN discovery logic to recognize standby APIC controllers and represent them alongside active controllers in the topology view. Full visibility into APIC redundancy status helps customers confirm fabric resiliency and quickly identify controller-level issues without relying on manual verification outside NetBrain.