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<?php
namespace Krenor\Prometheus\Metrics;
use Krenor\Prometheus\Contracts\Types\Incrementable;
use Krenor\Prometheus\Exceptions\PrometheusException;
abstract class Counter extends Metric implements Incrementable
{
/**
* {@inheritdoc}
*/
public function type(): string
return 'counter';
}
*
* @return self
public function increment(array $labels = []): Incrementable
return $this->incrementBy(1, $labels);
public function incrementBy(float $value, array $labels = []): Incrementable
if ($value < 0) {
throw new PrometheusException('Counters can only be incremented by non-negative amounts.');
static::$storage->increment($this, $value, $labels);
return $this;
krenor /
prometheus-client
