add logging hooks for setIsOverloaded and setPreprocess
add logging hooks for setIsOverloaded and setPreprocess

Summary:
^

(Note: this ignores all push blocking failures!)

Differential Revision: D35455662

fbshipit-source-id: aa177a213e8e50a33c495e966bb021ca2a2edb7d

facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift