This read-only object records the sysUpTime value at the last point when any of this session's Counter32 statistics experienced a discontinuity, initially set to the time the session row was created. Management stations use it to detect whether a counter reset or wrapped unexpectedly, and it also changes whenever an old session for a given client-peer pair ends and a new one is established, letting a poller recognize it is now tracking a different session instance. If an admin sees pcePcepSessionDiscontinuityTime jump forward unexpectedly between polls, that signals the previous session was torn down and re-established rather than the counters simply continuing to increment.