@Override
    public String toString() {
        return "RemoteLogSegmentMetadataUpdate{" +
               "remoteLogSegmentId=" + remoteLogSegmentId +
               ", customMetadata=" + customMetadata +
               ", state=" + state +
               ", eventTimestampMs=" + eventTimestampMs() +
               ", brokerId=" + brokerId() +
               '}';
    }
It represents the state of the remote log segment. It can be one of the values of {@link RemoteLogSegmentState}.
storage/api/src/main/java/org/apache/kafka/server/log/remote/storage/RemoteLogSegmentMetadataUpdate.java