How to push alert to Grafana Cloud alert manager with AlertManagerEndpoint

[winston0410]

I am trying to push alert defined within my cluster to Grafana cloud's alert manager. I am aware of this config:
https://prometheus-operator.dev/docs/operator/api/#monitoring.coreos.com/v1.AlertmanagerEndpoints

I am able to pass most of the required config I get from Grafana Cloud into this section, but I have no idea how to specify the url for the endpoint.

---
apiVersion: monitoring.coreos.com/v1
kind: Prometheus
spec:
  alerting:
    alertmanagers:
      - name: grafana-cloud-alert-manager
        namespace: prometheus
        apiVersion: v2
        port: 443
        scheme: https
        basicAuth:
          username:
            name: alert-manager-secret
            key: username
          password:
            name: alert-manager-secret
            key: password          
        timeout: 15

Assuming my endoint is foo.grafana.com, where can I pass that url?

[simonpasquier]

I haven't done it before but I would look into https://kubernetes.io/docs/concepts/services-networking/service/#externalname