Allow configuration of prepared statement caching in Rails

Relates to https://gitlab.com/gitlab-org/gitlab-ce/issues/20723
Relates to https://gitlab.com/gitlab-org/gitlab-ce/issues/25505

CHANGELOG.md

@@ -11,6 +11,7 @@ are not the same (O Schwede) c4e83c5
 - Add configuration options for GitLab container registry to support notification endpoints to template (Alexandre Gomes) ef9b0f255
 - Update curl to 7.53.0 38aea7179
 - Update directory configuration structure to allow multiple settings per data directory
+<<<<<<< HEAD
 - Remove mailroom configuration template, reuse the default from GitLab 5511b246
 - Remove deprecated standalone GitLab CI configuration ad126ba
 - Expose configuration for HSTS which was removed from GitLab Rails f5919f
@@ -33,6 +34,7 @@ are not the same (O Schwede) c4e83c5
 - Gitaly service on by default 350dea
 - Update Nginx to 1.10.3
 - Added support for configuring hosts for database load balancing
+- Allow configuration of prepared statement caching in Rails
 8.17.3

files/gitlab-config-template/gitlab.rb.template

@@ -335,6 +335,8 @@ external_url 'GENERATED_EXTERNAL_URL'
 # gitlab_rails['db_socket'] = nil
 # gitlab_rails['db_sslmode'] = nil
 # gitlab_rails['db_sslrootcert'] = nil
+# gitlab_rails['db_prepared_statements'] = true
+# gitlab_rails['db_statements_limit'] = 1000
 ### GitLab Redis settings

files/gitlab-cookbooks/gitlab/attributes/default.rb

@@ -245,6 +245,8 @@ default['gitlab']['gitlab-rails']['db_socket'] = nil
 default['gitlab']['gitlab-rails']['db_sslmode'] = nil
 default['gitlab']['gitlab-rails']['db_sslrootcert'] = nil
 default['gitlab']['gitlab-rails']['db_sslca'] = nil
+default['gitlab']['gitlab-rails']['db_prepared_statements'] = true
+default['gitlab']['gitlab-rails']['db_statements_limit'] = 1000
 default['gitlab']['gitlab-rails']['redis_host'] = "127.0.0.1"
 default['gitlab']['gitlab-rails']['redis_port'] = nil

files/gitlab-cookbooks/gitlab/templates/default/database.yml.erb

@@ -17,3 +17,5 @@ production:
   sslrootcert: <%= single_quote(@db_sslrootcert) || single_quote(@db_sslca) %>
   sslca: <%= single_quote(@db_sslca) || single_quote(@db_sslrootcert) %>
   load_balancing: <%= @db_load_balancing.to_json %>
+  prepared_statements: <%= @db_prepared_statements %>
+  statements_limit: <%= @db_statements_limit %>