As a data manager, I need to know how much it will cost in practice to serve a certain collection of data files from S3.

This work will be done by THG. I'm adding this ticket so the story/task doesn't get forgotten. Since THG will do the work, it will require minimal story points on our part. However, I talked with Ted and Alek and they indicated that they want to include monitoring in with the Excel-based cost-model. This may take some time on our part since the hack to the S3 URLs was removed from the DMR++ module when I optimized it.