func (c Config) Merge() Config {
	cp := New()
	for subSys, tgtKV := range c {
		for tgt := range tgtKV {
			ckvs := c[subSys][tgt]
			for _, kv := range cp[subSys][Default] {
				_, ok := c[subSys][tgt].Lookup(kv.Key)
				if !ok {
					ckvs.Set(kv.Key, kv.Value)
				}
			}
			if _, ok := cp[subSys]; !ok {
				rnSubSys, ok := renamedSubsys[subSys]
				if !ok {

func GetHelp(subSys, key string, envOnly bool) (Help, error) {
	if len(subSys) == 0 {
		return Help{KeysHelp: config.HelpSubSysMap[subSys]}, nil
	}
	subSystemValue := strings.SplitN(subSys, config.SubSystemSeparator, 2)
	if len(subSystemValue) == 0 {
		return Help{}, config.Errorf("invalid number of arguments %s", subSys)
	}

	subSys = subSystemValue[0]

	if key != config.Default {
		envName = envName + config.Default + key
	}
	return env.Get(envName, defaultValue)
}

func lookupLegacyConfigForSubSys(ctx context.Context, subSys string) Config {
	cfg := NewConfig()
	switch subSys {
	case config.LoggerWebhookSubSys:
		var loggerTargets []string
		envs := env.List(legacyEnvLoggerHTTPEndpoint)
		for _, k := range envs {

func TestSubSysNotificationTargets(ctx context.Context, cfg config.Config, subSys string, transport *http.Transport) error {
	if err := checkValidNotificationKeysForSubSys(subSys, cfg[subSys]); err != nil {
		return err
	}

	targetList, err := fetchSubSysTargets(ctx, cfg, subSys, transport)
	if err != nil {
		return err
	}

	for _, target := range targetList {
		defer target.Close()
	}

		}

		// Enable config help in all modes.
		adminRouter.Methods(http.MethodGet).Path(adminVersion+"/help-config-kv").HandlerFunc(adminMiddleware(adminAPI.HelpConfigKVHandler, traceAllFlag)).Queries("subSys", "{subSys:.*}", "key", "{key:.*}")

		// Config KV history operations.
		if enableConfigOps {

}

// SignalService - sends signal to peer nodes.
func (client *peerRESTClient) SignalService(sig serviceSignal, subSys string, dryRun bool, execAt *time.Time) error {
	values := grid.NewMSS()
	values.Set(peerRESTSignal, strconv.Itoa(int(sig)))
	values.Set(peerRESTDryRun, strconv.FormatBool(dryRun))
	values.Set(peerRESTSubSys, subSys)
	if execAt != nil {
		values.Set(peerRESTExecAt, execAt.Format(time.RFC3339Nano))
	}

		if err != nil {
			return np, grid.NewRemoteErr(err)
		}
		subSys := vars.Get(peerRESTSubSys)
		// Apply dynamic values.
		ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
		defer cancel()
		if subSys == "" {
			err = applyDynamicConfig(ctx, objAPI, srvCfg)
		} else {
			err = applyDynamicConfigForSubSys(ctx, objAPI, srvCfg, subSys)
		}
		if err != nil {
			return np, grid.NewRemoteErr(err)

func (sys *NotificationSys) SignalConfigReload(subSys string) []NotificationPeerErr {
	ng := WithNPeers(len(sys.peerClients))
	for idx, client := range sys.peerClients {
		if client == nil {
			continue
		}
		client := client
		ng.Go(GlobalContext, func() error {
			return client.SignalService(serviceReloadDynamic, subSys, false, nil)
		}, idx, *client.host)
	}
	return ng.Wait()
}

            terminal = ft.getTerminal();
        }
        List<String> subs = new ArrayList<>();
        subs.add("type=" + terminal.getType());
        if (terminal instanceof TerminalExt te) {
            subs.add("provider=" + te.getProvider().name());
        }
        if (terminal instanceof AbstractPosixTerminal pt) {
            subs.add("pty=" + pt.getPty().getClass().getName());
        }