RequestKind
For links that do not use any partitioning fields, a 'single' app generation request is created. However, for apps that designate a set of partitioning fields and the user selects multiple values for any of those partitioning fields, then the ODAG service uses a separate, 'singlesub' app generation request to generate a separate app for each of the partition field value combinations chosen in the selection app and tracks the queuing and data load phase of each of those sub-apps separately. Note that 'singlesub' requests share the same link ID of their spawning 'multi' parent request.
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