I want to route 70% percentage of my traffic coming to service A to an external end point and append the URL.

To achieve this I created an externalName type service which points to external endpoint and then use treafik ingress controller to divide the weight in percentage.

My service definition looks something like this:

    ---
    apiVersion: v1
    kind: Service
    metadata:
      name: wensleydale
    spec:
      ports:
      - name: http
        targetPort: 80
        port: 80
      selector:
        app: cheese
        task: wensleydale

    ---
    kind: Service
    apiVersion: v1
    metadata:
      name: test-service
    spec:
      type: ExternalName
      externalName: www.google.com
      ports:
      - name: http
        targetPort: 80
        port: 80
      selector:
        app: cheese
        task: test-service

Ingress.yaml:

    apiVersion: extensions/v1beta1
    kind: Ingress
    metadata:
      annotations:
        traefik.ingress.kubernetes.io/service-weights: |
          test-service: 70%
          wensleydale: 30%
      name: cheese
    spec:
      rules:
      - http:
          paths:
          - backend:
              serviceName: test-service
              servicePort: 80
            path: /
          - backend:
              serviceName: wensleydale
              servicePort: 80
            path: /

What I want in addition is when traffic goes to test-service, I want to append path.
In my test-service I want the URL to be something like www.google.com/something

I'm open to use other tools to achieve this.