Currently the conf* (configcluster) servers in eqiad are on stretch but the ones in codfw are still on jessie.
There are 2 separate roles, configcluster and configcluster_stretch applied to them.
We should reimage the jessie machines with stretch and make them use the same role so that .. we get rid of jessie and servers are the same across both DCs.
Noticed this when confirming an unrelated change as noop and seeing these kinds of puppet error on conf2001:
Error: /Stage[main]/Apt/File[/usr/local/share/apt/base_packages.txt]: Could not evaluate: Could not retrieve information from environment production source(s) puppet:///modules/apt/base_packages.jessie
APT base packages have not been generated for jessie anymore. So this is starting to cause other issues. The puppet run does still finish though.