What is Cloudflare cache response "unknown" mean?

what is Cloudflare cache response “unknown” means ?
can i get this “unknown” definition like what other status explain in

https://support.cloudflare.com/hc/en-us/articles/200168266-What-do-the-various-Cloudflare-cache-responses-HIT-Expired-etc-mean-

This topic was automatically closed after 30 days. New replies are no longer allowed.