The value of sysUpTime corresponding to the last change
for any object in the ceRedunGroupTable.
The source of the change can be due to either an SNMP message
affecting an object in the table or due to any other source of
user input such as a command line interface.
The timestamp applies to all read-create objects even for
cases where the managed device only supports read-only
access because it doesn't require user configuration of
those objects.
If there has been no change since the last time the sysUpTime
was zero then report the sysUpTime as zero.