This is a Counter64 preserving the total Phase-2 tunnel delete requests sent by a now-expired control tunnel over its entire lifetime, per its description, the historical companion to the live cisgIpsSgTunOutP2SaDelReqs. It tells an admin how often this device itself tore down Phase-2 data SAs under that now-closed IKE tunnel during its life, which combined with a short SA lifetime setting could explain heavy renegotiation activity right up until the tunnel itself was terminated. A very high value here for a short-lived tunnel would suggest an aggressive local SA lifetime/lifesize setting was driving constant Phase-2 churn on that specific connection.