This is the completion status of this individual FSM task within its parent stage. For this chassis slot endpoint's FSM workflow, completion tracks this one queued task specifically — a stage can contain several tasks, so this is the finest-grained status an admin can check for exactly which sub-action succeeded or is still pending. A completion value other than 'success' on this task, item 'clear-config', would tell an admin that particular sub-action — not the stage as a whole — is what failed.