Heatmap View
Heatmap view provides a visual representation of events occurred during a specific time period within the stacktrace. The values are color coded, which helps to analyze complex data at a glance.
To enable heatmap view in JMC, go to the menu item Window, Show View, Other, Mission Control, and then Heatmap View. Click Open.
Here is a sample image of Heatmap view:
Figure 4-5 Heatmap view

Each cell represents an event that was recorded during a specific time period. Different colors indicate various events that occurred during a particular time period.