files/gitlab-cookbooks/gitlab/templates/default/session_store.yml.erb (5 lines of code) (raw):
# This file is managed by gitlab-ctl. Manual changes will be
# erased! To change the contents below, edit /etc/gitlab/gitlab.rb
# and run `sudo gitlab-ctl reconfigure`.
production:
session_cookie_token_prefix: <%= quote(@session_store_session_cookie_token_prefix) %>