public static boolean isSystem(String topic, String group) {
        return TopicValidator.isSystemTopic(topic) || isSystemGroup(group);
    }
@Test
    public void testIsSystem_EmptyTopicAndGroup_ReturnsFalse() {
        String topic = "";
        String group = "";
        boolean result = BrokerMetricsManager.isSystem(topic, group);
        assertThat(result).isFalse();
    }