This read-only TimeStamp object records the value of sysUpTime the last time this PCE discovery entry's information changed, with static entries showing zero if nothing has changed since the PCC last restarted. Admins use it to detect when a discovered PCE's advertised capabilities or reachability information last changed, which is useful for spotting instability in PCE discovery. For example, a value that keeps advancing on every poll would indicate this PCE's entry is being repeatedly updated, worth investigating for flapping discovery advertisements.