@Override
    public String toString() {
        return "StreamsMetadata {" +
                "hostInfo=" + hostInfo +
                ", stateStoreNames=" + stateStoreNames +
                ", topicPartitions=" + topicPartitions +
                ", standbyStateStoreNames=" + standbyStateStoreNames +
                ", standbyTopicPartitions=" + standbyTopicPartitions +
                '}';
    }
State stores owned by the instance as a standby replica

@return set of standby state store names
streams/src/main/java/org/apache/kafka/streams/state/StreamsMetadata.java