ContextKeys.php

<?php

declare (strict_types=1);
namespace OpenTelemetry\Context;


/**
 * @psalm-internal OpenTelemetry
 */
final class ContextKeys {
    public static function span() : ContextKeyInterface {
        static $instance;
        return $instance ??= Context::createKey('opentelemetry-trace-span-key');
    }
    public static function baggage() : ContextKeyInterface {
        static $instance;
        return $instance ??= Context::createKey('opentelemetry-trace-baggage-key');
    }

}