List all configured thresholds of the containing PM parameter.
The PMThreshold object covers the ability of the NE to supervise thresholds on a specific
PMParameter (i.e. if the NE is able to supervise thresholds on a PM parameter the object
PMThreshold has to exist, otherwise will never exist).

Object Lifecycle: Created and deleted by EMS.

Object Creation Notification Issued? NA
Object Deletion Notification Issued? NA
