The '''traffic''' project in labs provides a testbed for ATS related patches, both in terms of Lua/configuration and ATS itself. One of the [https://horizon.wikimedia.org/auth/switch/traffic/?next=/project/instances/ traffic instances] with hostname beginning in '''traffic-cache-''' can be used for this purpose. The '''traffic''' labs project also features a self-hosted puppetmaster on which puppet patches can be cherry-picked. At the time of this writing the instance is '''traffic-puppetmaster-buster.traffic.eqiad.wmflabs''', but double-check that this is still the case now that you are reading.
server = traffic-puppetmaster-buster.traffic.eqiad.wmflabs
</source>
The labs testbed provides a different, significantly simplified remap configuration compared to production. Right now it looks like this on cache_text instances: