models/classes/runner/StorageManager.php
protected function exists($key)
    {
        return isset($this->cache[$key]) && in_array($this->cache[$key]['state'], [self::STATE_ALIGNED, self::STATE_PENDING_WRITE]);
    }
protected function exists($key)
    {
        return isset($this->cache[$key]) && in_array($this->cache[$key]['state'], [self::STATE_ALIGNED, self::STATE_PENDING_WRITE]);
    }
Checks if a dataset exists for the provided key.

@param string $key
@return bool