This will make prometheus scrape its own metrics. This can be useful to verify basic functionality of prometheus or to have some known metrics to work with in other tests. For example we use the prometheus_ready metric to check basic functionality of the CLI part of the observabilityclient here https://opendev.org/openstack/python-observabilityclient/src/branch/master/observabilityclient/tests/functional/test_cli.py#L129 Change-Id: Icfaba3bec04a6ef48b0365566b757fb8261c65c4