You do not need to take any action from this. There is something about your gestures that you may want to change. The suggested change would probably improve your gesture set. The suggested change would almost certainly improve your gesture set. Like in a web browser, text that is underlined and blue is a link, usually to an example, gesture, or group.
Some links bring up the help window with relevant information.
Goodness Metrics quill evaluates your gestures and may give you suggestions in the log. One metric is for how good your gestures are in terms of humans, namely whether your gesture categories are different enough from each other that people will not be likely to get confused by them. The other metric is how good your gestures are for the recognizer. The recognizer goodness metric goes down if you have training gestures that are misrecognized or extremely different from others in their category, or gesture categories that are too similar to each other. The maximum for both metrics is 1000.