This timestamp records when the FSM state currently reported for the port-discovery object that runs the neighbor-discovery process for a fabric-interconnect port was last updated. An administrator uses fsmStamp to judge whether the FSM information being displayed for this PortDiscover instance is fresh or stale, which matters when deciding whether a stuck-looking workflow is truly stuck. For example, an fsmStamp that has not advanced in many minutes while fsmStatus still shows 'in progress' is a strong signal that this PortDiscover's workflow has actually hung.