Labeling Automation Scenarios
Certain visualization functions have extra steps of automation for their distinctive natures.
Label each point in DiscretePlot with the function variable present in the label. When the variable is not present or held in HoldForm, the label is for the entire dataset.
Automatic labeling for multiple parametric curves or regions in ParametricPlot chooses locations that discern different functions.
FeatureSpacePlot automatically constructs labels from data when the number of points is large.