def METHOD_NAME(self):
    """
    Get `X-RateLimit-` headers for this particular throttle. Each pair of headers
    contains the limit and the number of requests left in the limit. Since multiple
    rate limits can apply concurrently, the suffix identifies each pair uniquely.
    """
    prefix = "X-RateLimit"
    suffix = self.scope or self.__class__.__name__.lower()
    if hasattr(self, "history"):
        return {
            f"{prefix}-Limit-{suffix}": self.rate,
            f"{prefix}-Available-{suffix}": self.num_requests - len(self.history),
        }
    else:
        return {}