code: func (pfactory *PredicateMetadataFactory) GetMetadata(pod *v1.Pod, nodeNameToInfoMap map[string]*schedulernodeinfo.NodeInfo) PredicateMetadata {
  	// If we cannot compute metadata, just return nil
  	if pod == nil {
  		return nil
  	}
  	// existingPodAntiAffinityMap will be used later for efficient check on existing pods' anti-affinity
  	existingPodAntiAffinityMap, err := getTPMapMatchingExistingAntiAffinity(pod, nodeNameToInfoMap)
  	if err != nil {
  		return nil
  	}
  	// incomingPodAffinityMap will be used later for efficient check on incoming pod's affinity
  	// incomingPodAntiAffinityMap will be used later for efficient check on incoming pod's anti-affinity
  	incomingPodAffinityMap, incomingPodAntiAffinityMap, err := getTPMapMatchingIncomingAffinityAntiAffinity(pod, nodeNameToInfoMap)
  	if err != nil {
  		klog.Errorf("[predicate meta data generation] error finding pods that match affinity terms: %v", err)
  		return nil
  	}
  	predicateMetadata := &predicateMetadata{
  		pod:                                    pod,
  		podBestEffort:                          isPodBestEffort(pod),
  		podRequest:                             GetResourceRequest(pod),
  		podPorts:                               schedutil.GetContainerPorts(pod),
  		topologyPairsPotentialAffinityPods:     incomingPodAffinityMap,
  		topologyPairsPotentialAntiAffinityPods: incomingPodAntiAffinityMap,
  		topologyPairsAntiAffinityPodsMap:       existingPodAntiAffinityMap,
  	}
  	for predicateName, precomputeFunc := range predicateMetadataProducers {
  		klog.V(10).Infof("Precompute: %v", predicateName)
  		precomputeFunc(predicateMetadata)
  	}
  	return predicateMetadata
  }
docs: // GetMetadata returns the predicateMetadata used which will be used by various predicates.