private KafkaMetric getMetric(String name) {
        return metrics.metrics().get(metrics.metricName(
            name,
            CONSUMER_COORDINATOR_METRICS));
    }
@return Retriable coordinator errors and a boolean indicating if it is expected to mark
the coordinator unknown when the error occurs.
clients/src/test/java/org/apache/kafka/clients/consumer/internals/CommitRequestManagerTest.java