DevOps: How to use Istio for A/B testing?

1apiVersion: networking.istio.io/v1beta1
2kind: VirtualService
3metadata:
4  name: myapp
5spec:
6  hosts:
7    - myapp
8  http:
9    - match:
10        - headers:
11            x-ab-test:
12              exact: "variant-b"
13      route:
14        - destination:
15            host: myapp
16            subset: variant-b
17    - match:
18        - headers:
19            x-user-group:
20              exact: "beta-testers"
21      route:
22        - destination:
23            host: myapp
24            subset: variant-b
25    - route:
26        - destination:
27            host: myapp
28            subset: variant-a
29          weight: 90
30        - destination:
31            host: myapp
32            subset: variant-b
33          weight: 10

1match:
2  - headers:
3      cookie:
4        regex: ".*ab_test=variant-b.*"

1apiVersion: argoproj.io/v1alpha1
2kind: AnalysisTemplate
3metadata:
4  name: ab-test-analysis
5spec:
6  metrics:
7    - name: conversion-rate
8      interval: 5m
9      count: 12
10      successCondition: result[0] > 0.02
11      provider:
12        prometheus:
13          address: http://prometheus:9090
14          query: |
15            sum(rate(orders_total{variant="variant-b"}[5m])) /
16            sum(rate(requests_total{variant="variant-b"}[5m]))