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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
#pragma once
#ifndef ENABLE_METRICS_PREVIEW
# include "opentelemetry/metrics/observer_result.h"
OPENTELEMETRY_BEGIN_NAMESPACE
namespace metrics
{
class AsynchronousInstrument
{};
template <class T>
class ObservableCounter : public AsynchronousInstrument
{};
template <class T>
class ObservableGauge : public AsynchronousInstrument
{};
template <class T>
class ObservableUpDownCounter : public AsynchronousInstrument
{};
} // namespace metrics
OPENTELEMETRY_END_NAMESPACE
#endif
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