[tor-relays] Strange entries in notices.log

I am suddenly finding numerous entries in my /var/log/tor/notices log that look like this: Aug 22 01:21:46.000 [warn] Unable to store router descriptor Aug 22 01:21:46.000 [warn] Error writing to "/var/lib/tor/cached-descriptors.new": No space left on device What does this mean? What do I need to do about? Sent with [Proton Mail](https://proton.me/) secure email.