This is a Counter64 preserving the total notification payloads received by a now-expired control tunnel over its entire lifetime, per its description, the historical companion to the live cisgIpsSgTunInNotifys. A high final count here for a since-closed tunnel suggests that connection's peer was reporting frequent status changes or errors throughout its life, which combined with the specific termination reason helps build a complete post-mortem picture. An unusually notification-heavy history entry for a tunnel that ultimately failed would point an admin toward reviewing what kinds of errors that specific peer kept reporting.