This read-only TimeTicks value is the sysUpTime at the time of the last creation, deletion, or modification of an entry in the qbQosIfConfTable; it holds zero if the table's entry count has been unchanged since the agent last reinitialized. Admins poll this to quickly detect whether the QoS interface configuration table has changed without walking the whole table. For example, this object's value advancing between two polls tells an admin a QoS policing configuration entry was recently added, removed, or changed.