private static String topicBytesFetchedMetricName(String topic) {
        return "topic." + topic + ".bytes-fetched";
    }
This method is called by the {@link Fetch fetch} logic before it requests fetches in order to update the
internal set of metrics that are tracked.

@param subscription {@link SubscriptionState} that contains the set of assigned partitions
@see SubscriptionState#assignmentId()
clients/src/main/java/org/apache/kafka/clients/consumer/internals/FetchMetricsManager.java