What? Aren’t you reading every message in every thread? You are falling down on the job, Jason! 
Anyway, read here: http://thingsthataresmart.wiki/index.php?title=Ask_Alexa#Advanced:Interfacing_With_Ask_Alexa.28version_2.1.3.2B.29
This is a new feature that will allow external apps (Yes…CoRE also) to send messages to a ‘queue’ that will then notify you whenever you do an action in Ask Alexa. Since you can’t wake up Alexa when something happens (i.e. a trigger), this is the next best thing…So, let’s say CoRE monitors some water sensors…while you could push this out or SMS it out, you also have the option of dropping the message into the queue…then the next time you go ANYTHING with Alexa it will tell you a message is available and you can listen to it…Think Answering machine for Alexa 