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 }}

  - {{.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",

	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:

// - VM
// - Naked
// - Headless
// - TProxy
// - Multi-Subset
var RegularPod Matcher = func(instance echo.Instance) bool {
	return instance.Config().IsRegularPod()
}

var NotRegularPod = Not(RegularPod)

// MultiVersion matches echos that have Multi-version specific setup.
var MultiVersion Matcher = func(i echo.Instance) bool {
	if len(i.Config().Subsets) != 2 {
		return false
	}
	var matchIstio, matchLegacy bool

	}
	return resp
}

// newClusterFilter maps a non-subset cluster name to the list of actual cluster names (default or subset) actually
// requested by the client. gRPC will usually request a group of clusters that are used in the same route; in some
// cases this means subsets associated with the same default cluster aren't all expected in the same CDS response.

func (cb *ClusterBuilder) buildWaypointInboundVIPCluster(proxy *model.Proxy, svc *model.Service, port model.Port, subset string) *clusterWrapper {
	clusterName := model.BuildSubsetKey(model.TrafficDirectionInboundVIP, subset, svc.Hostname, port.Port)

	discoveryType := convertResolution(cb.proxyType, svc)
	var lbEndpoints []*endpoint.LocalityLbEndpoints

  hosts:
  - "%s"
`, apps.B.Config().ClusterLocalFQDN()))
					},
				},
				{
					"subsets",
					func(t framework.TestContext) {
						cfg := tmpl.EvaluateOrFail(t, `
apiVersion: networking.istio.io/v1beta1
kind: DestinationRule
metadata:
  name: mysvc-dr
spec:
  host: {{.host}}
  subsets:
{{- range .dst }}
  - name: {{ .Config.Cluster.Name }}
    labels: