code: func (gce *Cloud) GetHealth(name string, instanceGroupLink string) (*compute.BackendServiceGroupHealth, error) {
  	groupRef := &compute.ResourceGroupReference{Group: instanceGroupLink}
  	return gce.service.BackendServices.GetHealth(gce.projectID, name, groupRef).Do()
  }
docs: // GetHealth returns the health of the BackendService identified by the given
  // name, in the given instanceGroup. The instanceGroupLink is the fully
  // qualified self link of an instance group.