This is the free-text description field stored on a 64-bit threshold definition object, the definition of one 64-bit-valued statistics threshold, used for larger cumulative counters such as total bytes transferred, that belongs to a threshold policy. An admin can use this field to record a human-readable note about a particular 64-bit threshold definition instance, since UCS Manager itself does not auto-populate it with diagnostic detail. For example, an admin documenting a 64-bit threshold definition tied to a given threshold policy might fill this field in with a short note explaining its purpose, which then shows up wherever that instance is displayed.