This task was originally meant only to remove nutcracker from the MediaWiki's config, but why not be bold and expand its scope!
Nutcracker (for memcached) is currently used in the following:
- labswiki/wikitech (there is a plan to fold labswiki into the MW appservers sometimes during 2019/2020 FY)
- Thumbor T221081
The configuration on app/api appservers for memcached has been removed with https://gerrit.wikimedia.org/r/#/c/operations/puppet/+/510697.
The idea for this task is to migrate tools using nutcracker to mcrouter (if possible) to avoid maintaining in the long run two code bases (the nutcracker's one is basically abandoned).