We want to enable Prometheus listener in Octavia

Issue

• Customer is asking to configure an octavia listener with Prometheus protocol but unfortunately he can not as it is not enabled.

• We checked that there is the variable allow_prometheus_listeners in here but we do not know where to enable it.

• We do not see any octavia config in:

[stack@director] ~]$ cat /var/lib/config-data/puppet-generated/
crond/                    heat/                     ironic_api.md5sum         keepalived/               mistral/                  nova/                     swift/
crond.md5sum              heat_api/                 ironic_inspector/         keepalived.md5sum         mistral.md5sum            nova.md5sum               swift.md5sum
glance_api/               heat_api.md5sum           ironic_inspector.md5sum   keystone/                 mysql/                    placement/                swift_ringbuilder/
glance_api.md5sum         heat.md5sum               ironic.md5sum             keystone.md5sum           mysql.md5sum              placement.md5sum          swift_ringbuilder.md5sum
haproxy/                  ironic/                   iscsid/                   memcached/                neutron/                  rabbitmq/                 zaqar/
haproxy.md5sum            ironic_api/               iscsid.md5sum             memcached.md5sum          neutron.md5sum            rabbitmq.md5sum           zaqar.md5sum

• In our templates, we just have the network config related to octavia:

[stack@director] ~]$ cat templates/octavia.yaml
resource_registry:
  OS::TripleO::Services::OctaviaApi: /usr/share/openstack-tripleo-heat-templates/deployment/octavia/octavia-api-container-puppet.yaml
  OS::TripleO::Services::OctaviaHousekeeping: /usr/share/openstack-tripleo-heat-templates/deployment/octavia/octavia-housekeeping-container-puppet.yaml
  OS::TripleO::Services::OctaviaHealthManager: /usr/share/openstack-tripleo-heat-templates/deployment/octavia/octavia-health-manager-container-puppet.yaml
  OS::TripleO::Services::OctaviaWorker: /usr/share/openstack-tripleo-heat-templates/deployment/octavia/octavia-worker-container-puppet.yaml
  OS::TripleO::Services::OctaviaDeploymentConfig: /usr/share/openstack-tripleo-heat-templates/deployment/octavia/octavia-deployment-config.yaml

parameter_defaults:
  NeutronEnableForceMetadata: true
  OctaviaGenerateCerts: "True"
  OctaviaControlNetwork:  "lb-mgmt-net"
  OctaviaControlSubnet:  "lb-mgmt-subnet"
  OctaviaControlSecurityGroup:  "lb-mgmt-sec-group"
  OctaviaControlSubnetCidr:  "172.16.0.0/16"
  OctaviaControlSubnetGateway:  "172.16.0.1"
  OctaviaControlSubnetPoolStart:  "172.16.0.2"
  OctaviaControlSubnetPoolEnd:  "172.16.255.254"
  OctaviaLoadBalancerTopology: "ACTIVE_STANDBY"

• Can you support us and provide the info where to configure this?