Is there any document that states the differences of the loss_id categories?

From what I understand:

productive : self explanatory, production at full speed.

availability: The machine is NOT working (maybe because of a fault?) Also NO DURATION in time_ids in workorder.

perdormance: The machine is working but not in its full potential. Can we use that metric if we want the worker to set the setup time for the job? Where is it calculated?

Quality: I have no idea! Is the machine producing at all? Is there a problem with the output of the machine or the quality of the product? 

The code in mrp_workcenter.py has no comments about these.

edit: I found that for the availability duration to be non zero it must be in working hours.