This is the object's relative name (Rn) — just the last path segment of its Dn, the piece this DefinitionFsmStage instance contributes to its own address within the MIT tree. Pushing the policy out to the fabric happens as an ordered sequence of named steps, and this record is one of those steps — useful for telling whether a stuck rollout is stuck on the fabric-A push, the fabric-B push, or the final verify. For this kind of object the Rn is typically built from the same identifying value as its Dn's final segment, e.g. the tail end of `org-root/ep-qos-def-gold-video/fsm/stage-2`, so two sibling instances never end up with colliding addresses under the same parent.