serviceTargetPortStatPattern = "%TARGET_PORT%"
	servicePortNameStatPattern   = "%SERVICE_PORT_NAME%"
	subsetNameStatPattern        = "%SUBSET_NAME%"
)

// BuildStatPrefix builds a stat prefix based on the stat pattern.
func BuildStatPrefix(statPattern string, host string, subset string, port *model.Port, targetPort int, attributes *model.ServiceAttributes) string {

			},
			"reviews.default_grpc-svc_9443",
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			got := BuildStatPrefix(tt.statPattern, tt.host, tt.subsetName, tt.port, tt.targetPort, tt.attributes)
			if got != tt.want {
				t.Errorf("BuildStatPrefix:: Expected alt statname %s, but got %s", tt.want, got)
			}
		})
	}
}

func TestTraceOperation(t *testing.T) {
	tests := []struct {

		statPrefix := clusterName
		// If stat name is configured, use it to build the stat prefix.
		if len(push.Mesh.OutboundClusterStatName) != 0 {
			statPrefix = telemetry.BuildStatPrefix(push.Mesh.OutboundClusterStatName, string(service.Hostname), "", &model.Port{Port: port}, 0, &service.Attributes)
		}
		// Use the hostname as the SNI value if and only:
		// 1) if the destination is a CIDR;

		statPrefix := clusterName
		// If stat name is configured, build the stat prefix from configured pattern.
		if len(push.Mesh.OutboundClusterStatName) != 0 && service != nil {
			statPrefix = telemetry.BuildStatPrefix(push.Mesh.OutboundClusterStatName, routes[0].Destination.Host,
				routes[0].Destination.Subset, port, 0, &service.Attributes)
		}

		return lb.buildOutboundNetworkFiltersWithSingleDestination(

	if direction == model.TrafficDirectionOutbound {
		// If stat name is configured, build the alternate stats name.
		if len(cb.req.Push.Mesh.OutboundClusterStatName) != 0 {
			ec.cluster.AltStatName = telemetry.BuildStatPrefix(cb.req.Push.Mesh.OutboundClusterStatName,
				string(service.Hostname), subset, port, 0, &service.Attributes)
		}
	}

	return ec
}

			clusterName := model.BuildDNSSrvSubsetKey(model.TrafficDirectionOutbound, "", service.Hostname, port.Port)
			statPrefix := clusterName
			if len(push.Mesh.OutboundClusterStatName) != 0 {
				statPrefix = telemetry.BuildStatPrefix(push.Mesh.OutboundClusterStatName, string(service.Hostname), "", port, 0, &service.Attributes)
			}
			destinationRule := CastDestinationRule(proxy.SidecarScope.DestinationRule(