If you wanted to create a graph that showed how much each value contributed to the whole value, you would use an area chart.
Explanation:
An area chart is used to graph the cumulative sum of groups in order of time and to evaluate how each group contributes to the whole.
It is a line chart where the area between the line and the axis is shaded with a color. These graphs are commonly used to represent accumulated totals over time and are the conventional way to display stacked lines.
Virtual and physical metrics have to be collected and analysed to look for allocation problems such as: VM sprawl, too many VMs, or improperly provisioned VMs are occurring.