Exemplo n.º 1
0
// sanitizeLabels ensures that all the labels in groupingLabels and the
// `instance` label are present in each MetricFamily in metricFamilies. The
// label values from groupingLabels are set in each MetricFamily, no matter
// what. After that, if the 'instance' label is not present at all in a
// MetricFamily, it will be created (with an empty string as value).
//
// Finally, sanitizeLabels sorts the label pairs of all metrics.
func sanitizeLabels(
	metricFamilies map[string]*dto.MetricFamily,
	groupingLabels map[string]string,
) {
	gLabelsNotYetDone := make(map[string]string, len(groupingLabels))

	for _, mf := range metricFamilies {
	metric:
		for _, m := range mf.GetMetric() {
			for ln, lv := range groupingLabels {
				gLabelsNotYetDone[ln] = lv
			}
			hasInstanceLabel := false
			for _, lp := range m.GetLabel() {
				ln := lp.GetName()
				if lv, ok := gLabelsNotYetDone[ln]; ok {
					lp.Value = proto.String(lv)
					delete(gLabelsNotYetDone, ln)
				}
				if ln == string(model.InstanceLabel) {
					hasInstanceLabel = true
				}
				if len(gLabelsNotYetDone) == 0 && hasInstanceLabel {
					sort.Sort(prometheus.LabelPairSorter(m.Label))
					continue metric
				}
			}
			for ln, lv := range gLabelsNotYetDone {
				m.Label = append(m.Label, &dto.LabelPair{
					Name:  proto.String(ln),
					Value: proto.String(lv),
				})
				if ln == string(model.InstanceLabel) {
					hasInstanceLabel = true
				}
				delete(gLabelsNotYetDone, ln) // To prepare map for next metric.
			}
			if !hasInstanceLabel {
				m.Label = append(m.Label, &dto.LabelPair{
					Name:  proto.String(string(model.InstanceLabel)),
					Value: proto.String(""),
				})
			}
			sort.Sort(prometheus.LabelPairSorter(m.Label))
		}
	}
}
Exemplo n.º 2
0
// sanitizeLabels ensures that all the labels in groupingLabels and
// requiredLabels are present in each MetricFamily in metricFamilies. The label
// values from groupingLabels are set in each MetricFamily, no matter what. In
// contrast, requiredLabels contains only label names and no label values. Only
// if any of those labels are not present at all in a MetricFamily, they will be
// created (with an empty string as value).
//
// Finally, sanitizeLabels sorts the label pairs of all metrics.
func sanitizeLabels(
	metricFamilies map[string]*dto.MetricFamily,
	groupingLabels map[string]string, requiredLabels map[string]struct{},
) {
	gLabelsNotYetDone := make(map[string]string, len(groupingLabels))
	rLabelsNotYetDone := make(map[string]struct{}, len(requiredLabels))

	for _, mf := range metricFamilies {
	metric:
		for _, m := range mf.GetMetric() {
			for ln, lv := range groupingLabels {
				gLabelsNotYetDone[ln] = lv
			}
			for ln := range requiredLabels {
				rLabelsNotYetDone[ln] = struct{}{}
			}
			for _, lp := range m.GetLabel() {
				ln := lp.GetName()
				delete(rLabelsNotYetDone, ln)
				if lv, ok := gLabelsNotYetDone[ln]; ok {
					lp.Value = proto.String(lv)
					delete(gLabelsNotYetDone, ln)
				}
				if len(gLabelsNotYetDone)+len(rLabelsNotYetDone) == 0 {
					sort.Sort(prometheus.LabelPairSorter(m.Label))
					continue metric
				}
			}
			for ln, lv := range gLabelsNotYetDone {
				m.Label = append(m.Label, &dto.LabelPair{
					Name:  proto.String(ln),
					Value: proto.String(lv),
				})
				delete(rLabelsNotYetDone, ln)
				delete(gLabelsNotYetDone, ln) // To prepare map for next metric.
			}
			for ln := range rLabelsNotYetDone {
				m.Label = append(m.Label, &dto.LabelPair{
					Name:  proto.String(ln),
					Value: proto.String(""),
				})
				delete(rLabelsNotYetDone, ln) // To prepare map for next metric.
			}
			sort.Sort(prometheus.LabelPairSorter(m.Label))
		}
	}
}
Exemplo n.º 3
0
func ExampleLabelPairSorter() {
	labelPairs := []*dto.LabelPair{
		&dto.LabelPair{Name: proto.String("status"), Value: proto.String("404")},
		&dto.LabelPair{Name: proto.String("method"), Value: proto.String("get")},
	}

	sort.Sort(prometheus.LabelPairSorter(labelPairs))

	fmt.Println(labelPairs)
	// Output:
	// [name:"method" value:"get"  name:"status" value:"404" ]
}