code: @Override
      public DescribeActivationsResult describeActivations(DescribeActivationsRequest request) {
          request = beforeClientExecution(request);
          return executeDescribeActivations(request);
      }
docs: <p>
  Details about the activation, including: the date and time the activation was created, the expiration date, the
  IAM role assigned to the instances in the activation, and the number of instances activated by this registration.
  </p>
  
  @param describeActivationsRequest
  @return Result of the DescribeActivations operation returned by the service.
  @throws InvalidFilterException
  The filter name is not valid. Verify the you entered the correct name and try again.
  @throws InvalidNextTokenException
  The specified token is not valid.
  @throws InternalServerErrorException
  An error occurred on the server side.
  @sample AWSSimpleSystemsManagement.DescribeActivations
  @see <a href="http://docs.aws.amazon.com/goto/WebAPI/ssm-2014-11-06/DescribeActivations" target="_top">AWS API
  Documentation</a>