...
The shades of green represent higher or lower usage (darker green = higher usage, lighter green = lower usage). The legend on the right side of the chart shows what range of usage each shade of green represents. The scale is dynamic, which means it shifts and adapts to best represent your organization’s usage.
...
You can see exact usage numbers by hovering over any item in the heatmap.
...
There is a toggle at the top that allows you to shift whether to apply the scale in logarithmic format or linear.
...
You can change the category for which usage stats you’re viewing by using the drop down filter at the top right.
...