Merge branch 'weimeng-master-patch-38647' into 'master'

Navigating GitLab via Rails console

See merge request gitlab-org/gitlab!26571

doc/administration/index.md

@@ -200,6 +200,7 @@ Learn how to install, configure, update, and maintain your GitLab instance.
 - [Log system](logs.md): Where to look for logs.
 - [Sidekiq Troubleshooting](troubleshooting/sidekiq.md): Debug when Sidekiq appears hung and is not processing jobs.
 - [Troubleshooting Elasticsearch](troubleshooting/elasticsearch.md)
+- [Navigating GitLab via Rails console](troubleshooting/navigating_gitlab_via_rails_console.md)
 - [GitLab application limits](instance_limits.md)
 
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