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<?php declare(strict_types=1); namespace OpenTelemetry\API\Metrics; interface MeterInterface { /** * Reports measurements for multiple asynchronous instrument from a single callback. * * The callback receives an {@link ObserverInterface} for each instrument. All provided * instruments have to be created by this meter. * * ```php * $callback = $meter->batchObserve( * function( * ObserverInterface $usageObserver, * ObserverInterface $pressureObserver, * ): void { * [$usage, $pressure] = expensive_system_call(); * $usageObserver->observe($usage); * $pressureObserver->observe($pressure); * }, * $meter->createObservableCounter('usage', description: 'count of items used'), * $meter->createObservableGauge('pressure', description: 'force per unit area'), * ); * ``` * * @param callable $callback function responsible for reporting the measurements * @param AsynchronousInstrument $instrument first instrument to report measurements for * @param AsynchronousInstrument ...$instruments additional instruments to report measurements for * @return ObservableCallbackInterface token to detach callback * * @see https://opentelemetry.io/docs/specs/otel/metrics/api/#multiple-instrument-callbacks */ public function batchObserve( callable $callback, AsynchronousInstrument $instrument, AsynchronousInstrument ...$instruments ): ObservableCallbackInterface; /** * 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 * @param array $advisory an optional set of recommendations * @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, array $advisory = [] ): 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 array|callable $advisory an optional set of recommendations, or * deprecated: the first callback to report measurements * @param callable ...$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, $advisory = [], callable ...$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 * @param array $advisory an optional set of recommendations, e.g. * <code>['ExplicitBucketBoundaries' => [0.25, 0.5, 1, 5]]</code> * @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, array $advisory = [] ): 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 array|callable $advisory an optional set of recommendations, or * deprecated: the first callback to report measurements * @param callable ...$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, $advisory = [], callable ...$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 * @param array $advisory an optional set of recommendations * @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, array $advisory = [] ): 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 array|callable $advisory an optional set of recommendations, or * deprecated: the first callback to report measurements * @param callable ...$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, $advisory = [], callable ...$callbacks ): ObservableUpDownCounterInterface; }
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