In the blue ocean UI, attached to each build, there is a "changes" tab where one can view all the commits since the previous build, which is awesome. This is also available in the traditional UI. However, in the traditional UI, you can click on each commit to get some extra details about the commit (list of files changed, details about the autor, and link to a git web viewer). AFAIK, this is now available in the Blue Ocean UI. It's extremely useful when digging through the commit history to find something specific and should be available in the Blue Ocean UI.