code: func GetLoadBalancerAnnotationBackendShare(service *v1.Service) bool {
  	if l, exists := service.Annotations[ServiceAnnotationILBBackendShare]; exists && l == "true" {
  		return true
  	}
  
  	// Check for deprecated annotation key
  	if l, exists := service.Annotations[deprecatedServiceAnnotationILBBackendShare]; exists && l == "true" {
  		klog.Warningf("Annotation %q is deprecated and replaced with an alpha-specific key: %q", deprecatedServiceAnnotationILBBackendShare, ServiceAnnotationILBBackendShare)
  		return true
  	}
  
  	return false
  }
docs: // GetLoadBalancerAnnotationBackendShare returns whether this service's backend service should be
  // shared with other load balancers. Health checks and the healthcheck firewall will be shared regardless.