}
	if key != "" {
		value, ok := h.Lookup(key)
		if !ok {
			return Help{}, config.Errorf("unknown key %s for sub-system %s",
				key, subSys)
		}
		h = config.HelpKVS{value}
	}

	help := config.HelpKVS{}

	// Only for multiple targets, make sure
	// to list the ENV, for regular k/v EnableKey is
	// implicit, for ENVs we cannot make it implicit.
	if subSysHelp.MultipleTargets {

		config.KV{
			Key:   RoleID,
			Value: "",
		},
	}

	defaultHelpPostfix = func(key string) string {
		return config.DefaultHelpPostfix(DefaultKVS, key)
	}

	// Help for Identity Plugin
	Help = config.HelpKVS{
		config.HelpKV{
			Key:         URL,
			Description: `plugin hook endpoint (HTTP(S)) e.g. "http://localhost:8181/path/to/endpoint"` + defaultHelpPostfix(URL),
			Type:        "url",
		},
		config.HelpKV{

// help for each sub-system key.
var HelpSubSysMap = map[string]HelpKVS{}

// RegisterHelpSubSys - this function saves
// input help KVS for each sub-system globally,
// this function should be called only once
// preferably in during `init()`.
func RegisterHelpSubSys(helpKVSMap map[string]HelpKVS) {
	maps.Copy(HelpSubSysMap, helpKVSMap)
}