HP Network Optimizer SDN Application - Microsoft Lync 1.0 Administrator Guide

In addition, you can perform the following operations:
Click the View Best Effort Reasons link under the chart to enter the Best Effort Reasons page,
which provides details of the switches on which the DSCP marking on one or more flow failed.
For more information, see Viewing Best effort flow statistics.
Move the cursor over a bar and a tooltip appears showing the number of Best effort flows
with the corresponding reason during the sampling time period.
Viewing the Best effort reasons chart 23