Change the port
By default, the exporter listens on port 9180. If network or security constraints require using a different port, this can be changed using the port option:
juju config openstack-exporter port=8888
This config value may be changed at any time. The openstack-exporter service will be restarted to pick up the changes and updates will propagate to COS (eg. so Prometheus knows about the new port).