Enables or disables logging of more information in calls to VT_enterstate(). That function might be used by certain MPI implementations, runtime systems or applications to log internal states. If that is the case, it will be mentioned in the documentation of those components.
<level> is a positive number, with larger numbers enabling more details:
0 (= off) suppresses all additional states
1 (= on) enables one level of additional states
2, 3, ... enables even more details