Description of problem: After the last release of the 4.x branch I have noticed that the repo for Debian Stretch has not been created. Buster is there, but not Stretch. How reproducible: https://download.gluster.org/pub/gluster/glusterfs/4.0/4.0.1/Debian/stretch/
It seems the folder path on your server is wrong. The Stretch repo files seem to be in the Buster folder tree ;-( https://download.gluster.org/pub/gluster/glusterfs/4.0/4.0.1/Debian/buster/stretch/amd64/apt/pool/main/g/glusterfs/
Kaleb, can you take a look?