docs: def submit_openmetric(self, metric_name, metric, scraper_config, hostname=None):
          """
          For each sample in the metric, report it as a gauge with all labels as tags
          except if a labels dict is passed, in which case keys are label names we'll extract
          and corresponding values are tag names we'll use (eg: {'node': 'node'}).
  
          Histograms generate a set of values instead of a unique metric.
          send_histograms_buckets is used to specify if yes or no you want to
              send the buckets as tagged values when dealing with histograms.
  
          `custom_tags` is an array of 'tag:value' that will be added to the
          metric when sending the gauge to Datadog.
          """
          if metric.type in ["gauge", "counter", "rate"]:
              metric_name_with_namespace = '{}.{}'.format(scraper_config['namespace'], metric_name)
              for sample in metric.samples:
                  val = sample[self.SAMPLE_VALUE]
                  if not self._is_value_valid(val):
                      self.log.debug("Metric value is not supported for metric {}".format(sample[self.SAMPLE_NAME]))
                      continue
                  custom_hostname = self._get_hostname(hostname, sample, scraper_config)
                  # Determine the tags to send
                  tags = self._metric_tags(metric_name, val, sample, scraper_config, hostname=custom_hostname)
                  if metric.type == "counter" and scraper_config['send_monotonic_counter']:
                      self.monotonic_count(metric_name_with_namespace, val, tags=tags, hostname=custom_hostname)
                  elif metric.type == "rate":
                      self.rate(metric_name_with_namespace, val, tags=tags, hostname=custom_hostname)
                  else:
                      self.gauge(metric_name_with_namespace, val, tags=tags, hostname=custom_hostname)
          elif metric.type == "histogram":
              self._submit_gauges_from_histogram(metric_name, metric, scraper_config)
          elif metric.type == "summary":
              self._submit_gauges_from_summary(metric_name, metric, scraper_config)
          else:
              self.log.error("Metric type {} unsupported for metric {}.".format(metric.type, metric_name))