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<?php
declare(strict_types=1);
namespace OpenTelemetry\SDK\Metrics\Data;
use OpenTelemetry\SDK\Common\Attribute\AttributesInterface;
final class Exemplar
{
/**
* @var int|string
*/
private $index;
/**
* @var float|int
* @readonly
*/
public $value;
/**
* @readonly
*/
public int $timestamp;
/**
* @readonly
*/
public AttributesInterface $attributes;
/**
* @readonly
*/
public ?string $traceId;
/**
* @readonly
*/
public ?string $spanId;
/**
* @param int|string $index
* @param float|int $value
*/
public function __construct($index, $value, int $timestamp, AttributesInterface $attributes, ?string $traceId, ?string $spanId)
{
$this->index = $index;
$this->value = $value;
$this->timestamp = $timestamp;
$this->attributes = $attributes;
$this->traceId = $traceId;
$this->spanId = $spanId;
}
/**
* @param iterable<Exemplar> $exemplars
* @return array<list<Exemplar>>
*/
public static function groupByIndex(iterable $exemplars): array
{
$grouped = [];
foreach ($exemplars as $exemplar) {
$grouped[$exemplar->index][] = $exemplar;
}
return $grouped;
}
}
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