ResqueController.php

    /**
     * getQueueFailures
     *
     * @return array[][]
     */
    protected function getQueueFailures()
    {
        $resque = $this->getServiceLocator()->get('Resque');

        /** @var \CRedis_Client $redis */
        $redis = $resque->redis()->driver;

        $failure_count = $redis->llen('resque:failed');

        $failures = [];

        $failures_json = $redis->lRange('resque:failed', 0, $failure_count - 1);

        foreach ($failures_json as $id => $failure) {
            $failure = json_decode($failure, true);

            $failures[$failure['queue']][] =
                [
                    'id' => $id,
                    'failure' => $failure
                ];
        }

        return $failures;
    }