isFatal

public function isFatal(): bool {}

$conf = SimpleKafkaClient\Configuration();
$conf->set('metadata.broker.list', 'kafka:9092');
$producer = new SimpleKafkaClient\Producer($conf);
try {
    $producer->initTransactions(10000);
} catch (SimpleKafkaClient\KafkaErrorException $e) {
    if ($e->isFatal()) {
        // non-recoverable error
    }
}