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<?php
declare(strict_types=1);
namespace OpenTelemetry\API\Metrics;
interface MeterInterface
{
/**
* Creates a `Counter`.
*
* @param string $name name of the instrument
* @param string|null $unit unit of measure
* @param string|null $description description of the instrument
* @return CounterInterface created instrument
*
* @see https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/metrics/api.md#counter-creation
*/
public function createCounter(
string $name,
?string $unit = null,
?string $description = null
): CounterInterface;
/**
* Creates an `ObservableCounter`.
*
* @param string $name name of the instrument
* @param string|null $unit unit of measure
* @param string|null $description description of the instrument
* @param callable ...$callbacks responsible for reporting measurements
* @return ObservableCounterInterface created instrument
*
* @see https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/metrics/api.md#asynchronous-counter-creation
*/
public function createObservableCounter(
string $name,
?string $unit = null,
?string $description = null,
callable ...$callbacks
): ObservableCounterInterface;
/**
* Creates a `Histogram`.
*
* @param string $name name of the instrument
* @param string|null $unit unit of measure
* @param string|null $description description of the instrument
* @return HistogramInterface created instrument
*
* @see https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/metrics/api.md#histogram-creation
*/
public function createHistogram(
string $name,
?string $unit = null,
?string $description = null
): HistogramInterface;
/**
* Creates an `ObservableGauge`.
*
* @param string $name name of the instrument
* @param string|null $unit unit of measure
* @param string|null $description description of the instrument
* @param callable ...$callbacks responsible for reporting measurements
* @return ObservableGaugeInterface created instrument
*
* @see https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/metrics/api.md#asynchronous-gauge-creation
*/
public function createObservableGauge(
string $name,
?string $unit = null,
?string $description = null,
callable ...$callbacks
): ObservableGaugeInterface;
/**
* Creates an `UpDownCounter`.
*
* @param string $name name of the instrument
* @param string|null $unit unit of measure
* @param string|null $description description of the instrument
* @return UpDownCounterInterface created instrument
*
* @see https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/metrics/api.md#updowncounter-creation
*/
public function createUpDownCounter(
string $name,
?string $unit = null,
?string $description = null
): UpDownCounterInterface;
/**
* Creates an `ObservableUpDownCounter`.
*
* @param string $name name of the instrument
* @param string|null $unit unit of measure
* @param string|null $description description of the instrument
* @param callable ...$callbacks responsible for reporting measurements
* @return ObservableUpDownCounterInterface created instrument
*
* @see https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/metrics/api.md#asynchronous-updowncounter-creation
*/
public function createObservableUpDownCounter(
string $name,
?string $unit = null,
?string $description = null,
callable ...$callbacks
): ObservableUpDownCounterInterface;
}
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