Yoda Response: Diagnose and resolve message loss in Kafka streams, we shall. First, check the offsets, we must. Determine how many messages are in the topic and how much the offset has advanced. Important, this is.

Next, examine the replication factor. Ensure sufficient replication, we should, to safeguard against data loss. Verify acknowledgements, we must. Confirm that messages are being acknowledged and not lost in transit.

Check Kafka's internal consumer logs, we can. Use Kafka's built-in tools to inspect if the data is present in the streams. Review Kafka logs for any failure messages, we should. Logs can reveal issues with message processing or delivery.

Thus, by checking offsets, replication factors, acknowledgements, and logs, diagnose and resolve message loss in Kafka streams, we can.