if unit == "" {
					continue
				}
				if wantUnit, ok := numLabelUnits[k]; !ok {
					numLabelUnits[k] = unit
				} else if wantUnit != unit {
					if v, ok := ignoredUnits[k]; ok {
						v[unit] = true
					} else {
						ignoredUnits[k] = map[string]bool{unit: true}
					}
				}
			}
		}
	}
	// Infer units for keys without any units associated with
	// numeric tag values.

// associated with those keys.
func identifyNumLabelUnits(p *profile.Profile, ui plugin.UI) map[string]string {
	numLabelUnits, ignoredUnits := p.NumLabelUnits()

	// Print errors for tags with multiple units associated with
	// a single key.
	for k, units := range ignoredUnits {
		ui.PrintErr(fmt.Sprintf("For tag %s used unit %s, also encountered unit(s) %s", k, numLabelUnits[k], strings.Join(units, ", ")))
	}