When I choose Export from an interface Min/Max/Average chart, and select Export to XLS, I eventually get a file that is labeled as having xmit and rcv min, max, and average, but all of the fields for each direction are all the same.
So, all transmit fields labeled min max or average all have the same number, which appears to be the average. The receive fields are the same, with labeled min, max, and average, all appear to have entries that are the average for that timestamp.
So, exporting will not produce useful min or max export of data.
We were using these exports to attempt to prototype a solution, but it looks like we will need to access data more directly, which we were hoping to put off until it was needed, but, here we are.