For a while now, advertisers have been pushing for more controls over where their ads show on the Google Display Network and YouTube. But publishers that rely on AdSense for revenue have been wanting more transparency into policy enforcement. Until today, if a policy action was taken against a publisher by Google, ads were puled from the entire site. When this happened, it was tough to figure out what exactly went wrong, and it was hard to figure out how to fix it.
But on May 15, Google made an announcement on the ability to address violations more surgically, and a new tool for publishers to get more information about enforcements and address them. According to Google, they began working on the technology in 2015 and started testing these initiatives with publishers in a beta in the fall of 2016.