code: func gatherHostportMappings(podPortMapping *PodPortMapping) []*PortMapping {
  	mappings := []*PortMapping{}
  	for _, pm := range podPortMapping.PortMappings {
  		if pm.HostPort <= 0 {
  			continue
  		}
  		mappings = append(mappings, pm)
  	}
  	return mappings
  }
docs: // gatherHostportMappings returns all the PortMappings which has hostport for a pod