If you want to visualize how a metric's values have changed in comparison to an earlier time period, you can do so by leveraging the
timeshift functions detailed here. Currently, you can capture a metric's value from an hour, day, week, or month before.
To calculate this, you can create a query such as this:
((current_value - old_value) / old_value) * 100
Here's an example where we can see the percentage change of a system metric from one day ago to the present: