if len(suites) == 0 {
		return nil
	}
	ret := make([]string, 0, len(suites))
	validCiphers := sets.New[string]()
	for _, s := range suites {
		if IsValidCipherSuite(s) {
			if !validCiphers.InsertContains(s) {
				ret = append(ret, s)
			} else if log.DebugEnabled() {
				log.Debugf("ignoring duplicated cipherSuite: %q", s)
			}
		} else if log.DebugEnabled() {

		log.Debugf("MergeGateways: merging gateway %q :\n%v", gatewayName, gatewayCfg)
		snames := sets.String{}
		for _, s := range gatewayCfg.Servers {
			if len(s.Name) > 0 {
				if snames.InsertContains(s.Name) {
					log.Warnf("Server name %s is not unique in gateway %s and may create possible issues like stat prefix collision ",
						s.Name, gatewayName)
				}
			}
			if s.Port == nil {

				errs = AppendValidation(errs, fmt.Errorf("service entry port may not be null"))
				continue
			}
			if servicePorts.InsertContains(port.Name) {
				errs = AppendValidation(errs, fmt.Errorf("service entry port name %q already defined", port.Name))
			}
			if servicePortNumbers.InsertContains(port.Number) {
				errs = AppendValidation(errs, fmt.Errorf("service entry port %d already defined", port.Number))
			}

	// for any clusters that share the same name the first cluster is kept and the others are discarded.
	have := sets.String{}
	out := make([]*discovery.Resource, 0, len(clusters))
	for _, c := range clusters {
		if !have.InsertContains(c.Name) {
			out = append(out, c)
		} else {
			cb.req.Push.AddMetric(model.DuplicatedClusters, c.Name, cb.proxyID,
				fmt.Sprintf("Duplicate cluster %s found while pushing CDS", c.Name))
		}
	}