@SdkInternalApi
    final AddTagsResult executeAddTags(AddTagsRequest addTagsRequest) {

        ExecutionContext executionContext = createExecutionContext(addTagsRequest);
        AWSRequestMetrics awsRequestMetrics = executionContext.getAwsRequestMetrics();
        awsRequestMetrics.startEvent(Field.ClientExecuteTime);
        Request<AddTagsRequest> request = null;
        Response<AddTagsResult> response = null;

        try {
            awsRequestMetrics.startEvent(Field.RequestMarshallTime);
            try {
                request = new AddTagsRequestMarshaller().marshall(super.beforeMarshalling(addTagsRequest));
                // Binds the request metrics to the current request.
                request.setAWSRequestMetrics(awsRequestMetrics);
                request.addHandlerContext(HandlerContextKey.CLIENT_ENDPOINT, endpoint);
                request.addHandlerContext(HandlerContextKey.ENDPOINT_OVERRIDDEN, isEndpointOverridden());
                request.addHandlerContext(HandlerContextKey.SIGNING_REGION, getSigningRegion());
                request.addHandlerContext(HandlerContextKey.SERVICE_ID, "Elastic Load Balancing");
                request.addHandlerContext(HandlerContextKey.OPERATION_NAME, "AddTags");
                request.addHandlerContext(HandlerContextKey.ADVANCED_CONFIG, advancedConfig);

            } finally {
                awsRequestMetrics.endEvent(Field.RequestMarshallTime);
            }

            StaxResponseHandler<AddTagsResult> responseHandler = new StaxResponseHandler<AddTagsResult>(new AddTagsResultStaxUnmarshaller());

            response = invoke(request, responseHandler, executionContext);

            return response.getAwsResponse();

        } finally {

            endClientExecution(awsRequestMetrics, request, response);
        }
    }
<p>
Adds the specified tags to the specified load balancer. Each load balancer can have a maximum of 10 tags.
</p>
<p>
Each tag consists of a key and an optional value. If a tag with the same key is already associated with the load
balancer, <code>AddTags</code> updates its value.
</p>
<p>
For more information, see <a
href="https://docs.aws.amazon.com/elasticloadbalancing/latest/classic/add-remove-tags.html">Tag Your Classic Load
Balancer</a> in the <i>Classic Load Balancers Guide</i>.
</p>

@param addTagsRequest
       Contains the parameters for AddTags.
@return Result of the AddTags operation returned by the service.
@throws LoadBalancerNotFoundException
        The specified load balancer does not exist.
@throws TooManyTagsException
        The quota for the number of tags that can be assigned to a load balancer has been reached.
@throws DuplicateTagKeysException
        A tag key was specified more than once.
@sample AmazonElasticLoadBalancing.AddTags
@see <a href="http://docs.aws.amazon.com/goto/WebAPI/elasticloadbalancing-2012-06-01/AddTags" target="_top">AWS
     API Documentation</a>
aws-java-sdk-elasticloadbalancing/src/main/java/com/amazonaws/services/elasticloadbalancing/AmazonElasticLoadBalancingClient.java