Update 2k reference architecture guidance for Sidekiq

Problem to solve

• https://docs.gitlab.com/ee/administration/reference_architectures/2k_users.html says to setup sidekiq server
• https://docs.gitlab.com/ee/administration/reference_architectures/2k_users.html#configure-gitlab-rails still seems to have sidekiq enabled
• Architecture diagram is missing sidekiq on https://docs.gitlab.com/ee/administration/reference_architectures/2k_users.html

Further details

• PostgreSQL example uses trust_auth_cidr_addresses but https://docs.gitlab.com/omnibus/settings/database.html#configure-postgresql-block recommends not using it
  • Not to be changed, required when doing a multi-node setup to allow access from the Rails / Sidekiq nodes. gitlab-org/gitlab#439927 (comment 1753614826)
• git_data_dirs is used but is being retired: https://docs.gitlab.com/ee/update/versions/gitlab_16_changes.html#gitaly-configuration-structure-change
  • Not to be changed, Clients (Rails/Sidekiq) use this setting gitlab-org/gitlab#439927 (comment 1753614826)
• (https://docs.gitlab.com/omnibus/settings/database.html#configure-postgresql-block references securesqlpassword but I see it called as SQL_USER_PASSWORD_HASH instead)
  • Outside of RA, to be clarified with the team #283 (comment 1753719968)

Proposal

Who can address the issue

Other links/references