You remember OLR? If you don't, let me refresh your memory. It was the Offensive Line Rating which was introduced a few years back by the site The Pulling lineman as a way of ranking each NFL team's offensive line. At one time the statistic was widely respected and saw some notoriety, but by 2013 the statistic faded away.
Since then, the guys who were behind the OLR have been working on how to tweak that statistic. And last week they rolled out the new version of which includes not just the offensive line but all blocking by each team.