you should be able to with the below mib for 'Off line Device count '
-- 1.3.6.1.4.1.388.50.1.4.1.14.2
wingStatsNocDevOffLineInfoCount OBJECT-TYPE
SYNTAX Unsigned32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"Off line Device count
XPath: /wing-stats/noc/device-offline-list/count"
::= { wingStatsNocDevOffLineInfo 2 }