def __x_google_quota_descriptor(self, metric_costs):
return {<EOL>'<STR_LIT>': {<EOL>metric: cost for (metric, cost) in metric_costs.items()<EOL>}<EOL>} if metric_costs else None<EOL>
Describes the metric costs for a call.

        Args:
          metric_costs: Dict of metric definitions to the integer cost value against
            that metric.

        Returns:
          A dict descriptor describing the Quota limits for the endpoint.