apiVersion: release-notes/v2
kind: feature
area: traffic-management

releaseNotes:
- |

					// if not duplicated, append
					mergedRule.Subsets = append(mergedRule.Subsets, subset)
				} else {
					// duplicate subset
					ps.AddMetric(DuplicatedSubsets, string(resolvedHost), "",
						fmt.Sprintf("Duplicate subset %s found while merging destination rules for %s",
							subset.Name, string(resolvedHost)))
				}
			}

			// If there is no top level policy and the incoming rule has top level

{{- $subsets := .Subsets }}
{{- $cluster := .Cluster }}
{{- range $i, $subset := $subsets }}
{{- range $revision, $version := $revVerMap }}
apiVersion: apps/v1
{{- if $.StatefulSet }}
kind: StatefulSet
{{- else }}
kind: Deployment
{{- end }}
metadata:
{{- if $.Compatibility }}
  name: {{ $.Service }}-{{ $subset.Version }}-{{ $revision }}
{{- else }}
  name: {{ $.Service }}-{{ $subset.Version }}
{{- end }}

        subset: v1
---
apiVersion: networking.istio.io/v1alpha3
kind: VirtualService
metadata:
  name: reviews-mirror
  namespace: default
spec:
  http:
  - route:
    - destination:
        host: reviews
        subset: v1
    mirror: # Includes mirroring, but should not generate any errors
      host: reviews
      subset: v1
---
apiVersion: networking.istio.io/v1alpha3

	for _, x := range xl {
		if y.subsetOf(x) {
			return true
		}
	}
	return false
}

// subsetOf reports whether xl ⊆ yl.
func (xl termlist) subsetOf(yl termlist) bool {
	if yl.isEmpty() {
		return xl.isEmpty()
	}

	// each term x of xl must be a subset of yl
	for _, x := range xl {
		if !yl.supersetOf(x) {
			return false // x is not a subset yl
		}
	}
	return true

  - {{.Destination}}
  http:
  - route:
    - destination:
        host: {{.Destination}}
        subset: my-subset
---
apiVersion: networking.istio.io/v1alpha3
kind: DestinationRule
metadata:
  name: {{.Destination}}
spec:
  host: {{.Destination}}
  subsets:
  - name: my-subset
    labels:
      subset: my-subset`
			t.ConfigIstio().Eval(apps.Namespace.Name(), map[string]string{
				"Destination": "a",

        host: "{{ .To.ClusterLocalFQDN }}"
        subset: "vistio"
  - name: "legacy-by-default"
    route:
    - destination:
        host: "{{ .To.ClusterLocalFQDN }}"
        subset: "vlegacy"
---
apiVersion: networking.istio.io/v1beta1
kind: DestinationRule
metadata:
  name: "{{ .To.ServiceName }}"
spec:
  host: "{{ .To.ClusterLocalFQDN }}"
  subsets:
  - name: "vistio"
    labels:
      version: "vistio"

	for _, x := range xl {
		if y.subsetOf(x) {
			return true
		}
	}
	return false
}

// subsetOf reports whether xl ⊆ yl.
func (xl termlist) subsetOf(yl termlist) bool {
	if yl.isEmpty() {
		return xl.isEmpty()
	}

	// each term x of xl must be a subset of yl
	for _, x := range xl {
		if !yl.supersetOf(x) {
			return false // x is not a subset yl
		}
	}
	return true

{{- $subsets := .Subsets }}
{{- $cluster := .Cluster }}
{{- range $i, $subset := $subsets }}
apiVersion: apps/v1
kind: Deployment
metadata:
  name: {{ $.Service }}-{{ $subset.Version }}
spec:
  replicas: 1
  selector:
    matchLabels:
      istio.io/test-vm: {{ $.Service }}
      istio.io/test-vm-version: {{ $subset.Version }}
  template:
    metadata:
      annotations:

        host: "multiversion"
        subset: "vistio"
  - name: "legacy-by-default"
    route:
    - destination:
        host: "multiversion"
        subset: "vlegacy"
---
apiVersion: networking.istio.io/v1alpha3
kind: DestinationRule
metadata:
  name: "multiversion"
  annotations:
    test-suite: "automtls-partial-sidecar-dr-no-tls"
spec:
  host: "multiversion"
  subsets:
  - name: "vistio"
    labels: