Have you ever encountered a situation where an external service did not respond, and you had to describe the system's behavior?

Yes, in practice, there have often been situations where an external service did not respond. In such cases, it is important to describe the system's behavior to ensure stability and clarity for users and developers.

For example, if a payment service does not respond, the system can:

• Show a message to the user about temporary unavailability and suggest trying again later.
• Record the request in a queue for re-sending later.
• Log the error for subsequent analysis.

Such a description helps determine how the system should behave in case of failures to minimize negative impact and ensure correct error handling.