 a novel problem or an event that hasn’t been seen before.
                                </li>
                            </ul>
                            <p>
                                Such a perspective dissipates certain distinctions: if a page satisfies the preceding four bullets, it’s irrelevant whether the page is triggered by white-box or black-box monitoring. This perspective also amplifies certain distinctions: it’s better to spend much more effort on catching symptoms than causes; w