feature: Allow overriding the backend name and port in keycloakx chart

[hpdvanwyk]

This is useful for overriding the backend of certain paths to not go to Keycloak.
One use case is when using Keycloak with the https://github.com/aerogear/keycloak-metrics-spi plugin along with aws-load-balancer-controller. This allow using the "alb.ingress.kubernetes.io/actions.${action-name}" annotation to make in-realm metrics endpoints 404 instead of exposing them on the public internet. This would otherwise be annoying to achieve since this plugin puts metrics on <base url>/realms/<realm>/metrics.

For example this allows creating the following ingress object which will 404 on all /realms//metrics paths while allowing everything else under /realms/:

apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: release-name-keycloakx
  namespace: default
  annotations:
    alb.ingress.kubernetes.io/actions.response-metrics: "{\"type\":\"fixed-response\",\"fixedResponseConfig\":{\"statusCode\":\"404\"}}\n"
spec:
  ingressClassName: alb
  tls:
    - hosts:
        - "${host}"
  rules:
    - host: "${host}"
      http:
        paths:
          - path: "/auth/realms/*/metrics"
            pathType: ImplementationSpecific
            backend:
              service:
                name: response-metrics
                port:
                  name: use-annotation
          - path: "/auth/realms/*"
            pathType: ImplementationSpecific
            backend:
              service:
                name: release-name-keycloakx-http
                port:
                  name: http

with the values.yaml snippet:

  rules:
    - host: "${host}"
      paths:
        - path: '{{ tpl .Values.http.relativePath $ | trimSuffix "/" }}/realms/*/metrics'
          pathType: ImplementationSpecific
          backendOverride:
            name: response-metrics
            port: use-annotation
        - path: '{{ tpl .Values.http.relativePath $ | trimSuffix "/" }}/realms/*'
          pathType: ImplementationSpecific

[stefangries]

Thank you for your contribution. Please adjust the naming of the variables so that they match the naming conventions of this chart.

Features are switched on via .enabled, for example. Please also add the default value ‘false’, so that we remain backward compatible.

[github-actions]

This pull request has been marked as stale because it has been open for 30 days with no activity. It will be automatically closed in 10 days if no further activity occurs.

[stefangries]

@hpdvanwyk Still interested in getting this merged? Please see my previous comment :-)

[github-actions]

This pull request has been marked as stale because it has been open for 30 days with no activity. It will be automatically closed in 10 days if no further activity occurs.