Requests for membership in the mediawiki group on Gerrit, which grants +2 access to the mediawiki/* projects.
For other kinds of Gerrit privilege requests use Gerrit-Privilege-Requests.
Requests for access must stay open for at least one full week and you must advertise your request on wikitech-l.
If you are a WMF staff member, request membership in the "wmf" LDAP group instead.