log queue size
log queue size

Summary: Adds info about the size of the workload queue to the logs we write whenever something new gets added to the queue.

Reviewed By: mroch

Differential Revision: D30582684

fbshipit-source-id: e6ea11445d76579fc5dc7418408ef7a6286b7174

mroch/flow,mroch/flow,facebook/flow,mroch/flow,mroch/flow,facebook/flow,facebook/flow,facebook/flow,mroch/flow,facebook/flow,mroch/flow,facebook/flow,mroch/flow,facebook/flow