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

one use

	go.opentelemetry.io/otel/api/metric (current package)
		must.go#L138: func (mm MeterMust) NewInt64UpDownSumObserver(name string, callback Int64ObserverFunc, oos ...InstrumentOption) Int64UpDownSumObserver {

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