How to scale a vm and a floating IP in cfy 3.4 ?

my.yaml

node_templates:
  apache_vm:
    type: cloudify.openstack.nodes.Server
    capabilities:
      scalable:
        properties:
          default_instances: 1
    relationships:
      - target: apache_ip
      type: cloudify.openstack.server_connected_to_floating_ip

  apache_ip:
    type: cloudify.openstack.nodes.FloatingIP

groups:

  apache:
    members: [apache_vm, apache_ip]

  scale_up_group:
    members: [apache]
    policies:
      auto_scale_up:
        type: scale_policy_type
        properties:
          default_instances: 1
          policy_operates_on_group: true
          ...
          ...
          ...
        triggers:
          execute_scale_workflow:
            type: cloudify.policies.triggers.execute_workflow
            parameters:
              workflow: scale
              workflow_parameters:
                delta: 1
                node_id: my_app
                scale_compute: true