Kuidas jälgiti töötlemata kirjeid, mis läksid DLQ-sse?

Dead Letter Queue (DLQ) is used for storing messages that could not be processed. To track such records, the following approaches are commonly used:

• Logging errors during message processing with indication of the rejection reason.
• Monitoring the DLQ with specialized tools or dashboards that show the number and details of messages.
• Setting up alerts (notifications) when new messages appear in the DLQ.

For example, in a system based on MQTT or Kafka, you can configure a subscription to the DLQ and automatically collect statistics or initiate reprocessing.