InstrumentType.php

<?php

declare (strict_types=1);
namespace OpenTelemetry\SDK\Metrics;


/**
 * Instrument type.
 *
 * Has to be type-hinted as `string|InstrumentType` to be forward compatible.
 */
final class InstrumentType {
    public const COUNTER = 'Counter';
    public const UP_DOWN_COUNTER = 'UpDownCounter';
    public const HISTOGRAM = 'Histogram';
    
    /** @experimental */
    public const GAUGE = 'Gauge';
    public const ASYNCHRONOUS_COUNTER = 'AsynchronousCounter';
    public const ASYNCHRONOUS_UP_DOWN_COUNTER = 'AsynchronousUpDownCounter';
    public const ASYNCHRONOUS_GAUGE = 'AsynchronousGauge';
    private function __construct() {
    }

}