This counter tracks how many times the T2-shutdown timer, which bounds a graceful shutdown, expired while waiting to complete teardown. This indicates associations are having trouble closing cleanly, which can leave stale association state lingering and potentially delay a subsequent attempt to re-establish signaling with the same peer. A spike in T2 expirations during a coordinated maintenance shutdown of multiple peers would suggest the shutdown sequence itself, not just the data path, is being disrupted.