In a Fully Distributed Deployment(FDD) mode of WSO2SP v4.4.0 I would like to know and understand each component like

• What is a receiver node?
• What is the difference between worker node and receiver node?
• How to deploy a custom extension in FDD which is being deployed in kubernetes.

Any additional pointers and advises related to good practices and performance are welcome as well.

Thanks, Ashmeet