Method NumLabelUnits

profile/profile.go:499–552

NumLabelUnits returns a map of numeric label keys to the units associated with those keys and a map of those keys to any units that were encountered but not used. Unit for a given key is the first encountered unit for that key. If multiple units are encountered for values paired with a particular ke

()

// If no units are encountered for a particular key, the unit is then inferred
// based on the key.
func (p *Profile) NumLabelUnits() (map[string]string, map[string][]string) {
	numLabelUnits := map[string]string{}
	ignoredUnits := map[string]map[string]bool{}
	encounteredKeys := map[string]bool{}

	// Determine units based on numeric tags for each sample.
	for _, s := range p.Sample {
		for k := range s.NumLabel {
			encounteredKeys[k] = true
			for _, unit := range s.NumUnit[k] {
				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.
	for key := range encounteredKeys {
		unit := numLabelUnits[key]
		if unit == "" {
			switch key {
			case "alignment", "request":
				numLabelUnits[key] = "bytes"
			default:
				numLabelUnits[key] = key
			}
		}
	}

	// Copy ignored units into more readable format
	unitsIgnored := make(map[string][]string, len(ignoredUnits))
	for key, values := range ignoredUnits {
		units := make([]string, len(values))
		i := 0
		for unit := range values {
			units[i] = unit
			i++
		}
		sort.Strings(units)
		unitsIgnored[key] = units
	}

	return numLabelUnits, unitsIgnored
}

// String dumps a text representation of a profile. Intended mainly
// for debugging purposes.