Ajmal Karuthakantakath shows us an application which performs fairly simple anomaly detection using Kafka Streams:
The problem is in the banking loan payment domain, where customers have taken a loan and they need to make monthly payments to repay the loan amount.
Assume there are millions of customers in the system and all these customers need to make monthly payments to their account. Each customer may have a different monthly due date depending on their monthly loan due date.
Each customer payment will appear as a PaymentScheduleEvent event. Customers can make more than one PaymentScheduleEvent per month. Each monthly due date for a customer will appear as a PaymentDueEvent.
An arbitrarily chosen anomaly condition for this example is that if the amount due is more than $150 for any customer at any point in time, this generates an anomaly.
Click through for instructions, the application, and further resources. If you want to learn Kafka Streams, this should keep you busy for a little while.