Each row entry represents host tracking statistics information
about a particular subscriber host.
Rows are created or removed automatically by the system.
Rows are only created for a subscriber that is associated with
a host tracking policy.
A subscriber is associated with a host tracking policy if the value of
the object tmnxSubInfoSubProfile refers to a subscriber policy where
the value of the object tmnxSubProfHostTrackingPolicy is not empty.
Moreover, rows are only created where the statistics value is nonzero;
this allows faster walking through this table; hence, it is recommended
to perform only get-next-request operations to retrieve information
from this table.