The value of the object tmnxWppPortalStatsType indicates
the instance identifier of the statistics
contained in this conceptual row.
Together with the value of tmnxWppPortalStatsType it indicates
unambiguously what the value of tmnxWppPortalStatsVal means.
For example: if the value of the object tmnxWppPortalStatsType is equal
to 'event', the value of tmnxWppPortalStatsInstance indicates
the identifier of the type of event that this conceptual row
refers to, for example 'noResources',
and the value of tmnxWppPortalStatsVal indicates the number
of times a 'no resources' event occurred for this WPP portal.