[Improvement]: Amazon SNS for propagation

[lifthus]

What could be modified to improve our project?

For sign-in/out propagation, Introducing SNS looks cool.

What exactly are the improvements made with this modification?

Cloudhus' propagation latency will pretty much vanish.

How can this improvement be implemented exactly?

Amazon Simple Notification Service

Agreement

• I've checked if there's any other issue about this.