// us to create a slice from. Wait until it starts executing.
		gs.activeRanges[name] = activeRange{0, stack}
	}
}

// rangeActive indicates that a special range of time has been in progress.
func (gs *gState[R]) rangeActive(name string) {
	if gs.executing != R(noResource) {
		// If we're executing, and the range is active, then start
		// from wherever the goroutine started running from.

	EventSync:            "Sync",
	EventMetric:          "Metric",
	EventLabel:           "Label",
	EventStackSample:     "StackSample",
	EventRangeBegin:      "RangeBegin",
	EventRangeActive:     "RangeActive",
	EventRangeEnd:        "RangeEnd",
	EventTaskBegin:       "TaskBegin",
	EventTaskEnd:         "TaskEnd",
	EventRegionBegin:     "RegionBegin",
	EventRegionEnd:       "RegionEnd",
	EventLog:             "Log",

func (s *Summarizer) Event(ev *Event) {
	if s.syncTs == 0 {
		s.syncTs = ev.Time()
	}
	s.lastTs = ev.Time()

	switch ev.Kind() {
	// Record sync time for the RangeActive events.
	case EventSync:
		s.syncTs = ev.Time()

	// Handle state transitions.
	case EventStateTransition:
		st := ev.StateTransition()
		switch st.Resource.Kind {