util/stats/query_stats.go
func (s QueryTiming) SpanOperation() string {
	switch s {
	case EvalTotalTime:
		return "promqlEval"
	case ResultSortTime:
		return "promqlSort"
	case QueryPreparationTime:
		return "promqlPrepare"
	case InnerEvalTime:
		return "promqlInnerEval"
	case ExecQueueTime:
		return "promqlExecQueue"
	case ExecTotalTime:
		return "promqlExec"
	default:
		return "Unknown query timing"
	}
}
func (s QueryTiming) SpanOperation() string {
	switch s {
	case EvalTotalTime:
		return "promqlEval"
	case ResultSortTime:
		return "promqlSort"
	case QueryPreparationTime:
		return "promqlPrepare"
	case InnerEvalTime:
		return "promqlInnerEval"
	case ExecQueueTime:
		return "promqlExecQueue"
	case ExecTotalTime:
		return "promqlExec"
	default:
		return "Unknown query timing"
	}
}
// Return a string representation of a QueryTiming span operation.