This is the object's relative name (Rn) — just the last path segment of its Dn, the piece this DefinitionDelTaskFsmStage instance contributes to its own address within the MIT tree. Deleting the policy from the fabric happens as a short ordered sequence of named steps — e.g. removing it from fabric A, then fabric B — and this record is one of those steps, tracked separately so a stall or retry can be pinpointed to the exact stage it happened at. 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/del-task/fsm/stage-2`, so two sibling instances never end up with colliding addresses under the same parent.