Instances from service Tenant/Project missing

[Merlin]

Creating loadbalancers with Octavia creates Nova Instances in the service tenant/project.
But this instances are not reported via ceilometer.
There are no loadbancing meters from the neutron vhost ether.
But the neutron vhost is configured for ceilometer metering.

Does this work as expected?
Is there any way to activate Metering for the service project in ceilometer?

# My environment
OpenStack Stein
Ansible Managed
Ceilometer branch: stein/stable

# Reproduce
## Just create a loadbalancer like this:
openstack loadbalancer create --name lb1 --vip-subnet-id public-subnet
openstack loadbalancer show lb1
openstack loadbalancer listener create --name listener1 --protocol HTTP --protocol-port 80 lb1
openstack loadbalancer pool create --name pool1 --lb-algorithm ROUND_ROBIN --listener listener1 --protocol HTTP
openstack loadbalancer member create --subnet-id private-subnet --address 192.0.2.10 --protocol-port 80 pool1
openstack loadbalancer member create --subnet-id private-subnet --address 192.0.2.11 --protocol-port 80 pool1

## And look for the Amphora Instance ID in Gnocchi:
gnocchi resource show $(openstack server list --project service --limit 1 -c ID -f value)