Changes

When Mozilla moved to the "inbound" model of tree management, the Tree Sheriffs became important stewards of our engineering infrastructure. The primary responsibility of the Sheriffs is to aid developers to easily, quickly, and seamlessly land their code in the proper location(s) and ensure that code does not break our automated tests. In the service of this objective, the Sheriffs work closely with the larger engineering organization to create and enforce landing policies that increase productivity while maintaining an efficient and robust automated testing system. Beyond the policy role, they have also become shepherds of automation quality by monitoring intermittent failures, performing uplifts and merges, and identifying poorly performing automation machines. A formal module for the Tree Sheriffs in the larger context of the Activities Module was created: [[Modules/Activities#Tree_Sheriffs]].