https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/1361 introduces a Rake task into GitLab EE that opens 6 database connections in parallel. This breaks with the existing GDK configuration, which only permits 5 in parallel.
The pool size in production is 25, so this seems like an unnecessary restriction. Increasing the number to 6 allows the rake task to complete successfully.
/cc @rspeicher