The state of this threshold. An invalid state means that the
object could not be retrieved from the mib. A held state
indicates that the maximum successive exceptions for this
threshold has been reached and that alarms will not be
generated until an exception occurrs at a new level or no
exception occurs for the specified number of hold down
intervals at which point it becomes valid again. An ignored
state, indicates that this threshold is disabled and is not
being polled. A valid state indicates that this threshold is
under examination each polling period and no errors have been
encountered evaluating this object for exceptions. A
suspended state indicates that the object was not an integer
type; user should manually delete the suspended object.