Camila Macedo The Prometheus operator provides a very good document on the various options for exposing the service: https://github.com/coreos/prometheus-operator/blob/f9bc0aa0fd9aa936f500d9d241098863c60d873d/Documentation/user-guides/exposing-prometheus-and-alertmanager.md#exposing-prometheus-and-alertmanager.

I suggest you take a look. When using the ingress approach, you need to specify the path, but not the host.