I have personally built a workflow that takes an Alteryx Workflow and breaks the XML into sections that I then document into Word. I would suggest using line ends to split the XML into rows and then data mining for the appropriate records. Containers can make it challenging to use the XML parse too so I recommend the former method. Stuff such as Filters, Formulas, Inputs, and Outputs would be the must-haves IMO.
Log files you can get from an after-action event on the workflow or put the workflow through a runner macro and then save the log into a file or DB. For the data itself, I would recommend a final tool at the end called "Info" that can give you the field metadata for the tool.
