func ExtractConfigInstanceKey(cfg RefreshConfig) string {
	key, ok := cfg.(instanceKey)
	if ok {
		return key.InstanceKey()
	}
	return ""
}
// ExtractConfigInstanceKey is used to get the instance key from a refresh
// config.
ExtractConfigInstanceKey is used to get the instance key from a refresh
config.
// ExtractConfigInstanceKey is used to get the instance key from a refresh // config .
func ExtractConfigInstanceKey(cfg RefreshConfig) string {
	key, ok := cfg.(instanceKey)
	if ok {
		return key.InstanceKey()
	}
	return ""
}
func ExtractConfigInstanceKey ( cfg RefreshConfig ) string { key , ok := cfg . ( instanceKey ) if ok { return key . InstanceKey ( ) } return " " }
ExtractConfigInstanceKey is used to get the instance key from a refresh
config.
ExtractConfigInstanceKey is used to get the instance key from a refresh config .