T201366 is a ticket to replace the parsoid test machine ruthenium.eqiad.wmnet (jessie) with a stretch equivalent, scandium.eqiad.wmnet.
One requirement to unblock that will be the existence of a package for uprightdiff for stretch.
Currently on scandium:
E: Unable to locate package uprightdiff
(Among some other issues that need to be resolved but are not related)
On install1002, hosting apt.wikimedia.org:
[install1002:~] $ sudo -i reprepro ls uprightdiff uprightdiff | 1.0-1 | jessie-wikimedia | amd64, source