Charts can show different time ranges, allowing you to easily see if a problem is a brief spike or a longer-term issue.
Individual items on a chart can be quickly excluded from the display and the formatting changed, so you can focus on the problem at hand.
Where appropriate, the Y axis used for charts will change automatically as different time ranges are displayed and different smoothing options let you examine a detailed view of a short period or see a more general long-term trend as appropriate.