Per http://download.gluster.org/pub/gluster/glusterfs/LATEST/Debian/jessie/Jessie.README The package signing key should be at http://download.gluster.org/pub/gluster/glusterfs/LATEST/rsa.pub . It is not. Additionally, the rpm signing key is also not there. Prior to 3.8, the keys were in http://download.gluster.org/pub/gluster/glusterfs/3.7/LATEST/
You could just ping me on IRC
Kaleb, I think it's worth adding a quick comment on how the keys went missing and how you fixed it. (Especially for me, for when I take over bits of packaging responsibilities)
+1 on post mortem, so we wll know how we can add safety to prevent in the future.