https://specs.openstack.org/openstack/ironic-specs/specs/6.1/node-resource-class.html
http://dtantsur.github.io/posts/resource-classes-traits-and-allocations/
https:/ /specs. openstack. org/openstack/ ironic- specs/specs/ 6.1/node- resource- class.html
http:// dtantsur. github. io/posts/ resource- classes- traits- and-allocations /