@Override
    public String toString() {
        return String.format("RemoteFetch[source-broker-id=%d topic-partition=%s count=%d]",
                sourceBrokerId, topicPartition, count);
    }
Specifies a fetch (download) event from a second-tier storage. This is used to ensure the
interactions between Kafka and the second-tier storage match expectations.

@param sourceBrokerId The broker which fetched (a) remote log segment(s) from the second-tier storage.
@param topicPartition The topic-partition which segment(s) were fetched.
@param count The number of remote log segment(s) fetched.
storage/src/test/java/org/apache/kafka/tiered/storage/specs/RemoteFetchSpec.java