Merge 9.3 RC2
both modified: CHANGELOG.md
both modified: docker/openshift-template.json
both added: files/gitlab-cookbooks/gitlab-ee/recipes/pgbouncer.rb
both modified: files/gitlab-cookbooks/gitlab/libraries/prometheus.rb
both modified: spec/chef/gitlab-ee/recipes/geo-postgresql_spec.rb
both modified: spec/chef/recipes/prometheus_spec.rb
both modified: spec/libraries/omnibus_helper_spec.rb