"Openness" in DQL?

Hello DI/DQL community,

I am getting into some custom reporting with DQL and came across this sample query:

Get the name, size, active data size, percentage of data size that is active,

openness, and number of active users for each share

 

FROM msu

GET name, size, active_data_size,

(active_data_size*100/size) AS active_data_percent,

isopen, active_user_count;

 

My question is, what does 'openness' refer to in the description of this query?

 

Thanks,

Evan