ceilometer/server/backend/default.yml

classes:
- service.ceilometer.server.publisher.gnocchi
- service.ceilometer.server.publisher.panko
parameters:
  # gnocchi and panko are default backends for Ceilometer since Pike
  # they are incompatible with any legacy database publisher backends
  ceilometer:
    server:
      database: ~
      publisher:
        default:
          enabled: false