code: func ResourcePolicyIsKeep(annotations map[string]string) bool {
  	if annotations != nil {
  		resourcePolicyType, ok := annotations[ResourcePolicyAnno]
  		if ok && resourcePolicyType != deletePolicy {
  			return true
  		}
  	}
  	return false
  }
docs: // ResourcePolicyIsKeep accepts a map of Kubernetes resource annotations and
  //   returns true if the resource should be kept, otherwise false if it is safe
  //   for Helm to delete.