When a new machine is provisioned, it will trigger the _POST
/host/online_ webhook, indicating that it is online and ready to be
provisioned via configuration policy. It submits its hostname and SSH
public keys so the Ansible controller can connect to it. This
information is passed to the controller via an AMQP message, published
to a queue which the controller will consume in order to being
provisioning.
The controller itself will eventually be scheduled as a Kubernetes Job.
Dustin