docs: def container_fs_usage_bytes(self, metric, scraper_config):
          """
          Number of bytes that are consumed by the container on this filesystem.
          """
          metric_name = scraper_config['namespace'] + '.filesystem.usage'
          if metric.type not in METRIC_TYPES:
              self.log.error("Metric type %s unsupported for metric %s" % (metric.type, metric.name))
              return
          self._process_usage_metric(metric_name, metric, self.fs_usage_bytes, scraper_config)