Hello community,
For a better understanding, I think it could be great to define more precisely some specific notions in Graylog
I have an idea for the following terms but I 'm not sure so this would be very helpfull I you could clarifiy 
- 
unprocessed messages
 - 
messages appended
 - 
messages read
 - 
input buffer
 - 
process buffer
 - 
output buffer
 - 
In/Out (in the top right corner)
 
Thanks for these details ! 