--- issues: - | Nova leaks resource allocations in placement during ``POST /servers/{server_id}/action (revertResize Action)`` if the allocation held by the migration_uuid is modified in parallel with the revert operation. Nova will log an ERROR and will put the server into ERROR state but will not delete the migration allocation. We assume that this can only happen if somebody outside of nova is actively changing the migration allocation in placement. Therefore it is not considered as a bug.