In Confluent Cloud, the connector does not stop when serde errors occur. Instead, the connector continues processing records and sends the errors to a Dead Letter Queue (DLQ). You can use the record headers in a DLQ topic record to identify and troubleshoot an error when it occurs. Typically, these are configuration errors that can be easily corrected.
Read more at https://docs.confluent.io/current/cloud/connectors/dead-letter-queue.html