This Gauge32 holds the numeric error code returned by a remote endpoint (such as the port's peer or an internal management process) when this specific FSM run made a remote call that failed. Pairing this code with the workflow named in currentFsm is how an admin or TAC engineer identifies exactly which remote operation within that run went wrong. For example, a non-zero rmtErrCode logged during a port-deploy FSM run points at a specific low-level failure reported back from the fabric interconnect's control-plane process handling that port.