GitLab services are not restarted when upgrading GitLab on el8, or started if performing a fresh install

Summary

GitLab services are not restarted at the end of the upgrade when upgrading GitLab on el8

Steps to reproduce

• install GitLab 12.8.1 on CentOS8
• upgrade it to 12.8.6
• on other operating system, there is a GitLab restart happening at the end of the upgrade starting with the message Restarting previously running GitLab services (https://gitlab.com/gitlab-org/omnibus-gitlab/-/blob/master/files/gitlab-ctl-commands/upgrade.rb#L150). However, it's not happening on CentOS8

What is the current bug behavior?

Restart is not happening after upgrading GitLab on CentOS8

What is the expected correct behavior?

Likely restart should happen after upgrading GitLab on CentOS8 (restart is happening on CentOS7 and other distributions).

Relevant logs

Not sure if any logs can help in this case.

Details of package version

# rpm -qa | grep 'gitlab'
gitlab-ee-12.8.6-ee.0.el8.x86_64

Environment details

• Operating System: CentOS Linux release 8.0.1905 (Core)
• Installation Target: Vagrant
• Installation Type: Upgrade from version 12.8.1 to 12.8.6
• Single-node instance

Configuration details

# grep -v -e '^#' -e '^$' /etc/gitlab/gitlab.rb
external_url 'http://gitlab.test.tld'