@Override
        public String toString() {
            return "FetchPosition{" +
                    "offset=" + offset +
                    ", offsetEpoch=" + offsetEpoch +
                    ", currentLeader=" + currentLeader +
                    '}';
        }
Represents the position of a partition subscription.

This includes the offset and epoch from the last record in
the batch from a FetchResponse. It also includes the leader epoch at the time the batch was consumed.
clients/src/main/java/org/apache/kafka/clients/consumer/internals/SubscriptionState.java