We know how to handle these and have high confidence that these technologies will serve our purpose. Usage is strongly recommended for new projects.
We've already solved real-world problems with these technologies and gained some experience with it. These technologies still have some amount of risks that we have not seen but we have people that will share their experiences with it.
Technologies in ASSESS have a potential to be used in our infrastructure because they could probably add value to us. They do have a high risk of failure, since they are quite new and we do not have gained any or little experience with it. These can be used in projects that can handle this risk.
Technologies in this ring are not recommended for new projects but can usually be continued to use in existing projects. We do think that technologies in HOLD are not yet worth exploring further or should not be used anymore, even if they were used in the past.