The current state of the tracked object.
up(1) - The tracked object has been detected as being up.
down(2) - The tracked object has been detected as being
down.
testing(3) - The system is in the process of determining the
initial state of the tracked object.
disabled(4) - The tracked object has been taken out of service
(etsysTrackedObjectsCommonInservice has been set to
'false').