Check whether any of the CPU cores monitored by this instance has
        throttled since this instance was created.
        @return a boolean value

def has_throttled(self):
        """
        Check whether any of the CPU cores monitored by this instance has
        throttled since this instance was created.
        @return a boolean value
        """
        for file, value in self.cpu_throttle_count.items():
            try:
                new_value = int(util.read_file(file))
                if new_value > value:
                    return True
            except Exception as e:
                logging.warning('Cannot read throttling count of CPU from kernel: %s', e)
        return False