Reports pod requests & limits by looking at pod specs.

def _report_container_spec_metrics(self, pod_list, instance_tags):
        """Reports pod requests & limits by looking at pod specs."""
        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)