Values.ApplyPendingMaintenanceActionMessageSourceRepresents the input to ApplyPendingMaintenanceAction.
type nonrec t = {resourceIdentifier : String_.t;The Amazon Resource Name (ARN) of the resource that the pending maintenance action applies to.
*)applyAction : String_.t;The pending maintenance action to apply to this resource. Valid values: system-update, db-upgrade
*)optInType : String_.t;A value that specifies the type of opt-in request or undoes an opt-in request. An opt-in request of type immediate can't be undone. Valid values: immediate - Apply the maintenance action immediately. next-maintenance - Apply the maintenance action during the next maintenance window for the resource. undo-opt-in - Cancel any existing next-maintenance opt-in requests.
*)}