go.opentelemetry.io/otel/api/metric.MeterMust.NewFloat64UpDownSumObserver (method)

one use

	go.opentelemetry.io/otel/api/metric (current package)
		must.go#L148: func (mm MeterMust) NewFloat64UpDownSumObserver(name string, callback Float64ObserverFunc, oos ...InstrumentOption) Float64UpDownSumObserver {

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