All cache hosts are currently running jessie and need to be upgraded to stretch.
Packages needed in stretch-wikimedia:
- varnish
- varnish-modules
- libvmod-tbf
- vhtcpd
- varnishkafka
- libvmod-netmapper (liburcu2 -> liburcu4)
- libvmod-re2 (libre2-1 -> libre2-3)
traffic-text-stretch.traffic.eqiad.wmflabs is running stretch and has the cache::text role applied. It can be used to test the upgrade.