With AWS IoT Analytics you can now configure notification for data sets that receive late data and refresh the results of the data sets with late data. Late data is data that arrives after an initial result is generated for the data set. You can configure late data notification for a data set by simply setting a time window within which late data is expected to arrive. AWS IoT Analytics sends late data notifications via Amazon CloudWatch Events when it receives late data for the data set. For more information, please visit the late data notification page in the AWS IoT Analytics user guide.
Source:: Amazon AWS