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<?php
declare(strict_types=1);
namespace OpenTelemetry\API\Metrics;
interface ObservableUpDownCounterInterface
{
/**
* @param callable(ObserverInterface): void $callback function responsible for
* reporting the measurements (as absolute values)
* @return ObservableCallbackInterface token to detach callback
*/
public function observe(callable $callback): ObservableCallbackInterface;
}
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