Function newSummary

prometheus/summary.go:194–273

(desc *Desc, opts SummaryOpts, labelValues ...string)

}

func newSummary(desc *Desc, opts SummaryOpts, labelValues ...string) Summary {
	if len(desc.variableLabels.names) != len(labelValues) {
		panic(makeInconsistentCardinalityError(desc.fqName, desc.variableLabels.names, labelValues))
	}

	for _, n := range desc.variableLabels.names {
		if n == quantileLabel {
			panic(errQuantileLabelNotAllowed)
		}
	}
	for _, lp := range desc.constLabelPairs {
		if lp.GetName() == quantileLabel {
			panic(errQuantileLabelNotAllowed)
		}
	}

	if opts.Objectives == nil {
		opts.Objectives = map[float64]float64{}
	}

	if opts.MaxAge < 0 {
		panic(fmt.Errorf("illegal max age MaxAge=%v", opts.MaxAge))
	}
	if opts.MaxAge == 0 {
		opts.MaxAge = DefMaxAge
	}

	if opts.AgeBuckets == 0 {
		opts.AgeBuckets = DefAgeBuckets
	}

	if opts.BufCap == 0 {
		opts.BufCap = DefBufCap
	}

	if opts.now == nil {
		opts.now = time.Now
	}
	if len(opts.Objectives) == 0 {
		// Use the lock-free implementation of a Summary without objectives.
		s := &noObjectivesSummary{
			desc:       desc,
			labelPairs: MakeLabelPairs(desc, labelValues),
			counts:     [2]*summaryCounts{{}, {}},
		}
		s.init(s) // Init self-collection.
		s.createdTs = timestamppb.New(opts.now())
		return s
	}

	s := &summary{
		desc: desc,
		now:  opts.now,

		objectives:       opts.Objectives,
		sortedObjectives: make([]float64, 0, len(opts.Objectives)),

		labelPairs: MakeLabelPairs(desc, labelValues),