What kind of events, from a business process perspective, fall into retry chains and DLT?

Events related to critical business processes, where guaranteed delivery and processing are important, were placed in retry chains and Dead Letter Topic (DLT). For example:

• Customer orders that require confirmation and payment.
• Transactions in financial systems, where an error could lead to data or funds loss.
• Events updating order or payment status.

Such events might not be processed due to temporary failures (e.g., unavailability of external services), so they were placed in retry chains for reprocessing. If, after several attempts, the event could not be processed, it was moved to the DLT for subsequent analysis and manual intervention to prevent data loss and ensure business process integrity.