gistfile1.txt

    /**
     * {@inheritdoc}
     */
    public function getStatus()
    {
        $states = $this->messageManager->countStates();

        if ($states[MessageInterface::STATE_OPEN] > $this->checkLevel[MessageInterface::STATE_OPEN]) {
            return new BackendStatus(BackendStatus::CRITICAL, 'Too much messages waiting to be processed');
        }

        if ($states[MessageInterface::STATE_IN_PROGRESS] > $this->checkLevel[MessageInterface::STATE_IN_PROGRESS]) {
            return new BackendStatus(BackendStatus::FAILURE, 'Too many messages processed at the same time');
        }

        if ($states[MessageInterface::STATE_ERROR] > $this->checkLevel[MessageInterface::STATE_ERROR]) {
            return new BackendStatus(BackendStatus::FAILURE, 'Too many errors');
        }

        if ($states[MessageInterface::STATE_DONE] > $this->checkLevel[MessageInterface::STATE_DONE]) {
            return new BackendStatus(BackendStatus::CRITICAL, 'Too many processed messages, please clean the database');
        }
    }