Kafka Producer drops samples when the sending operation timeout.

The Kafka Producer feature in OpenNMS has a flag called kafkaSendQueueCapacity to create an in-memory queue when the Kafka cluster is unavailable.

Unfortunately, when the producer tries to send messages and receives a timeout, the message is dropped. It doesn't retry to send it, leading to missing content that could affect third-party installations.

In other words, in terms of the queue, it is not re-inserted to try again later.