Noticed this while investigating something else, I believe u-a in wmcs is supposed to upgrade all packages coming from e.g. jessie-wikimedia too. That doesn't seem to be the case on a couple of instances I spot checked, namely filippo-test-jessie3.eqiad.wmflabs and deployment-prometheus01.eqiad.wmflabs
root@deployment-prometheus01:~# apt-cache policy diamond diamond: Installed: 3.5-6 Candidate: 4.0.515-4~bpo8+2 Version table: 4.0.515-4~bpo8+2 0 1001 http://apt.wikimedia.org/wikimedia/ jessie-wikimedia/backports amd64 Packages *** 3.5-6 0 100 /var/lib/dpkg/status
root@filippo-test-jessie3:~# apt-cache policy hhvm hhvm: Installed: 3.12.7+dfsg-1+wmf4 Candidate: 3.18.5+dfsg-1+wmf1 Version table: 3.18.5+dfsg-1+wmf1 0 1001 http://apt.wikimedia.org/wikimedia/ jessie-wikimedia/main amd64 Packages *** 3.12.7+dfsg-1+wmf4 0 100 /var/lib/dpkg/status