Configuring message expiry

A real-life enterprise system may have different expiry rules for different messages. Some, like financial transactions, must be processed reliably. Therefore, they should either have a long expiry period or never expire. Non-critical notifications, on the other hand, like drinks offers during a sports game, become irrelevant very quickly and should expire in minutes if not delivered.

In this exercise, we will see how both of these strategies can be configured.