go.opentelemetry.io/otel/api/metric.BatchObserverMust.NewInt64UpDownSumObserver (method)

one use

	go.opentelemetry.io/otel/api/metric (current package)
		must.go#L206: func (bm BatchObserverMust) NewInt64UpDownSumObserver(name string, oos ...InstrumentOption) Int64UpDownSumObserver {