A killer add-on feature for Perfstack would be charting of a metric that looks in the past - for example to be able to show the same metric (same entity) yesterday at this time, or last week.
For example if looking at CPU on a server that does scheduled batch jobs, you could compare to see if peak CPU is different, and/or compare finish times of the workloads.
Maybe there is some way to accomplish that now, if so I welcome anyone who has ideas! Thanks!