A canary deployment virtualservice spec, to specify weights of 90 and 10% for primary and canary respectively

canary-deployment-virtualservice-spec-example.yaml

apiVersion: networking.istio.io/v1alpha3
kind: VirtualService
metadata:
  name: foo
  namespace: default
spec:
  gateways:
  - default-gateway
  - mesh
  hosts:
  - foo.example.com
  http:
  - route:
    - destination:
        host: foo.default.svc.cluster.local
        port:
          number: 80
        subset: foo-1
      weight: 90
    - destination:
        host: foo.default.svc.cluster.local
        port:
          number: 80
        subset: foo-2
      weight: 10