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diff --git a/doc/administration/index.md b/doc/administration/index.md
index 00c8863f200..650cb10a64a 100644
--- a/doc/administration/index.md
+++ b/doc/administration/index.md
@@ -2,7 +2,7 @@
description: 'Learn how to install, configure, update, and maintain your GitLab instance.'
---
-# Administrator documentation **(CORE ONLY)**
+# Administrator Docs **(CORE ONLY)**
Learn how to administer your self-managed GitLab instance.
@@ -64,6 +64,7 @@ Learn how to install, configure, update, and maintain your GitLab instance.
- [External Classification Policy Authorization](../user/admin_area/settings/external_authorization.md) **(PREMIUM ONLY)**
- [Upload a license](../user/admin_area/license.md): Upload a license to unlock features that are in paid tiers of GitLab. **(STARTER ONLY)**
- [Admin Area](../user/admin_area/index.md): for self-managed instance-wide configuration and maintenance.
+- [S/MIME Signing](smime_signing_email.md): how to sign all outgoing notification emails with S/MIME
#### Customizing GitLab's appearance
@@ -185,3 +186,13 @@ Learn how to install, configure, update, and maintain your GitLab instance.
- [Debugging tips](troubleshooting/debug.md): Tips to debug problems when things go wrong
- [Log system](logs.md): Where to look for logs.
- [Sidekiq Troubleshooting](troubleshooting/sidekiq.md): Debug when Sidekiq appears hung and is not processing jobs.
+- Useful [diagnostics tools](troubleshooting/diagnostics_tools.md) that are sometimes used by the GitLab
+ Support team.
+- [Troubleshooting ElasticSearch](troubleshooting/elasticsearch.md): Tips to troubleshoot ElasticSearch.
+- [Kubernetes troubleshooting](troubleshooting/kubernetes_cheat_sheet.md): Commands and tips useful
+ for troubleshooting Kubernetes-related issues.
+- Useful links from the Support Team:
+ - [GitLab Developer Docs](https://docs.gitlab.com/ee/development/README.html).
+ - [Repairing and recovering broken Git repositories](https://git.seveas.net/repairing-and-recovering-broken-git-repositories.html).
+ - [Testing with OpenSSL](https://www.feistyduck.com/library/openssl-cookbook/online/ch-testing-with-openssl.html).
+ - [Strace zine](https://wizardzines.com/zines/strace/).