added docs and screenshot

app/views/admin/background_jobs/_head.html.haml

@@ -26,4 +26,4 @@
         = nav_link path: 'audit_logs#index' do
           = link_to admin_audit_logs_path, title: 'Audit Log' do
             %span
-              Audit Log
\ No newline at end of file
+              Audit Log

doc/administration/audit_events.md

@@ -28,3 +28,21 @@ To view the Audit Events user needs to have enough permissions to view the group
 Navigate to Group->Settings->Audit Events to view the Audit Events:
 ![audit events group](audit_events_group.png)
+
+# Audit Log (Admin only)
+
+> **Notes:**
+> [Introduced][ee-2336] in GitLab 9.3.
+
+Server-wide audit logging, available in GitLab Enterprise Edition Premium since 9.3 introduces
+the ability to observe user actions across the entire instance of your GitLab Server, making it
+easy to understand who changed what and when for audit purposes.
+
+To view the server-wide admin log, visit the Admin Area, select the Monitoring and choose Audit Log.
+
+It is possible to filter particular actions by choosing an audit data type from the filter drop-down.
+You can further filter by specific Group, Project or User (for authentication events).
+
+![audit log](audit_log.png)
+
+[ce-23361]: https://gitlab.com/gitlab-org/gitlab-ee/issues/2336