Smaws_Client_Lightsail.AttachInstancesToLoadBalancerAttaches one or more Lightsail instances to a load balancer.
After some time, the instances are attached to the load balancer and the health check status is available.
The attach instances to load balancer operation supports tag-based access control via resource tags applied to the resource identified by load balancer name. For more information, see the Lightsail Developer Guide.
val error_to_string : 
  [ Smaws_Lib.Protocols.AwsJson.error
  | `AccessDeniedException of Types.access_denied_exception
  | `AccountSetupInProgressException of
    Types.account_setup_in_progress_exception
  | `InvalidInputException of Types.invalid_input_exception
  | `NotFoundException of Types.not_found_exception
  | `OperationFailureException of Types.operation_failure_exception
  | `ServiceException of Types.service_exception
  | `UnauthenticatedException of Types.unauthenticated_exception ] ->
  stringval request : 
  'http_type Smaws_Lib.Context.t ->
  Types.attach_instances_to_load_balancer_request ->
  (Types.attach_instances_to_load_balancer_result,
    [> Smaws_Lib.Protocols.AwsJson.error
    | `AccessDeniedException of Types.access_denied_exception
    | `AccountSetupInProgressException of
      Types.account_setup_in_progress_exception
    | `InvalidInputException of Types.invalid_input_exception
    | `NotFoundException of Types.not_found_exception
    | `OperationFailureException of Types.operation_failure_exception
    | `ServiceException of Types.service_exception
    | `UnauthenticatedException of Types.unauthenticated_exception ])
    Stdlib.result