code: def _report_container_spec_metrics(self, pod_list, instance_tags):
          
          for pod in pod_list['items']:
              pod_name = pod.get('metadata', {}).get('name')
              pod_phase = pod.get('status', {}).get('phase')
              if self._should_ignore_pod(pod_name, pod_phase):
                  continue
  
              for ctr in pod['spec']['containers']:
                  if not ctr.get('resources'):
                      continue
  
                  c_name = ctr.get('name', '')
                  cid = None
                  for ctr_status in pod['status'].get('containerStatuses', []):
                      if ctr_status.get('name') == c_name:
                          # it is already prefixed with 'runtime://'
                          cid = ctr_status.get('containerID')
                          break
                  if not cid:
                      continue
  
                  pod_uid = pod.get('metadata', {}).get('uid')
                  if self.pod_list_utils.is_excluded(cid, pod_uid):
                      continue
  
                  tags = tagger.tag('%s' % cid, tagger.HIGH) + instance_tags
  
                  try:
                      for resource, value_str in iteritems(ctr.get('resources', {}).get('requests', {})):
                          value = self.parse_quantity(value_str)
                          self.gauge('{}.{}.requests'.format(self.NAMESPACE, resource), value, tags)
                  except (KeyError, AttributeError) as e:
                      self.log.debug("Unable to retrieve container requests for %s: %s", c_name, e)
  
                  try:
                      for resource, value_str in iteritems(ctr.get('resources', {}).get('limits', {})):
                          value = self.parse_quantity(value_str)
                          self.gauge('{}.{}.limits'.format(self.NAMESPACE, resource), value, tags)
                  except (KeyError, AttributeError) as e:
                      self.log.debug("Unable to retrieve container limits for %s: %s", c_name, e)
docs: Reports pod requests & limits by looking at pod specs.