This gauge holds the numeric error code from a remote invocation made while this log-control-endpoint FSM was running, part of the workflow that carries out the async workflow UCS Manager runs when it applies a change to that log-control endpoint. An admin treats a non-zero value as proof that a remote step of this operation failed, and looks up the code to learn the specific cause. For example, if the remote side of the workflow tracked by this log-control-endpoint FSM rejects a request, that peer's error code shows up here for UCS Manager to record.