@Override
    public ListRumMetricsDestinationsResult listRumMetricsDestinations(ListRumMetricsDestinationsRequest request) {
        request = beforeClientExecution(request);
        return executeListRumMetricsDestinations(request);
    }
<p>
Returns a list of destinations that you have created to receive RUM extended metrics, for the specified app
monitor.
</p>
<p>
For more information about extended metrics, see <a
href="https://docs.aws.amazon.com/cloudwatchrum/latest/APIReference/API_AddRumMetrcs.html">AddRumMetrics</a>.
</p>

@param listRumMetricsDestinationsRequest
@return Result of the ListRumMetricsDestinations operation returned by the service.
@throws ResourceNotFoundException
        Resource not found.
@throws InternalServerException
        Internal service exception.
@throws ValidationException
        One of the arguments for the request is not valid.
@throws AccessDeniedException
        You don't have sufficient permissions to perform this action.
@sample AWSCloudWatchRUM.ListRumMetricsDestinations
@see <a href="http://docs.aws.amazon.com/goto/WebAPI/rum-2018-05-10/ListRumMetricsDestinations" target="_top">AWS
     API Documentation</a>
aws-java-sdk-cloudwatchrum/src/main/java/com/amazonaws/services/cloudwatchrum/AWSCloudWatchRUMClient.java