On an Observed object -- one managed object that UCS Manager's observe/monitoring framework is currently tracking and reporting changes for -- cucsObserveObservedDataSrcAppType is a text (SnmpAdminString) field holding the type of application that originally produced the data being observed for this object. An admin reads this string because it carries the actual identifying detail -- not just an internal numeric ID -- needed to make sense of that specific Observed instance. For example, an admin reviewing Observed entries would look at cucsObserveObservedDataSrcAppType to see the concrete value rather than a bare object reference.