Add all info to admin_area/settings

Add all missing info to admin area settings page
as first step towards refactoring it completely.
Many missing or non-ideal links.

doc/administration/integration/terminal.md

@@ -96,7 +96,5 @@ they will receive a `Connection failed` message.
 
 > [Introduced](https://gitlab.com/gitlab-org/gitlab-foss/-/merge_requests/8413) in GitLab 8.17.
 
-Terminal sessions use long-lived connections; by default, these may last
-forever. You can configure a maximum session time in the Admin Area of your
-GitLab instance if you find this undesirable from a scalability or security
-point of view.
+Terminal sessions, by default, do not expire.
+You can limit terminal session lifetime in your GitLab instance. To do so, navigate to **{admin}** [**Admin Area > Settings > Web terminal**](../../user/admin_area/settings/index.md#general), and set a `max session time`.

doc/administration/monitoring/gitlab_self_monitoring_project/index.md

@@ -21,10 +21,7 @@ This project will be used for self monitoring your GitLab instance.
 
 1. Navigate to **Admin Area > Settings > Metrics and profiling**, and expand the **Self monitoring** section.
 1. Toggle the **Create Project** button on.
-1. It can take a few seconds for the project to be created. After the project is
-created, GitLab displays a message with a link to the project. The project
-will also be linked in the help text above the **Create Project** button. You can also
-find the project under **Projects > Your projects**.
+1. Once your GitLab instance creates the project, you'll see a link to the project in the text above the **Create Project** toggle. You can also find it under **Projects > Your projects**.
 
 ## Deleting the self monitoring project
 

doc/user/admin_area/settings/index.md

@@ -4,35 +4,110 @@ type: index
 
 # Admin Area settings **(CORE ONLY)**
 
-In the Admin Area **Settings** page, you can find various options for your GitLab
-instance like sign-up restrictions, account limits and quota, metrics, etc.
-
-Navigate to it by going to **Admin Area > Settings**. Some of the settings
-include:
-
-- [Account and limit settings](account_and_limit_settings.md) **(STARTER)**
-- [Continuous Integration and Deployment](continuous_integration.md)
-- [Email](email.md)
-- [Sign up restrictions](sign_up_restrictions.md)
-- [Sign in restrictions](sign_in_restrictions.md)
-- [Terms](terms.md)
-- [Third party offers](third_party_offers.md)
-- [Usage statistics](usage_statistics.md)
-- [Visibility and access controls](visibility_and_access_controls.md)
-- [User and IP rate limits](user_and_ip_rate_limits.md)
-- [Custom templates repository](instance_template_repository.md) **(PREMIUM)**
-- [Protected paths](protected_paths.md) **(CORE ONLY)**
-- [Help messages for the `/help` page and the login page](help_page.md)
-- [Push event activities limit and bulk push events](push_event_activities_limit.md)
-- [Gitaly timeouts](gitaly_timeouts.md)
+As an administrator of a GitLab self-managed instance, you can manage the behavior of your deployment. To do so, select **{admin}** **Admin Area > Settings**.
 
-NOTE: **Note:**
-You can change the [first day of the week](../../profile/preferences.md) for the entire GitLab instance
-in the **Localization** section of **Admin Area > Settings > Preferences**.
+The admin area is not accessible on GitLab.com, and settings can only be changed by the
+GitLab.com administrators. See the [GitLab.com settings](../../gitlab_com/index.md)
+documentation for all current settings and limits on the GitLab.com instance.
+
+## General
+
+Access the default page for admin area settings by navigating to
+**{admin}** **Admin Area > Settings > General**:
+
+| Option | Description |
+| ------ | ----------- |
+| [Visibility and access controls](visibility_and_access_controls.md) | Set default and restrict visibility levels. Configure import sources and Git access protocol. |
+| [Account and limit](account_and_limit_settings.md) **(STARTER)** | Set projects and maximum size limits, session duration, user options, and check feature availability for namespace plan. |
+| [Diff limits](../diff_limits.md) | Diff content limits. |
+| [Sign-up restrictions](sign_up_restrictions.md) | Configure the way a user creates a new account. |
+| [Sign in restrictions](sign_in_restrictions.md) | Set requirements for a user to sign-in. Enable mandatory two-factor authentication. |
+| [Terms of Service and Privacy Policy](terms.md) | Include a Terms of Service agreement and Privacy Policy that all users must accept. |
+| [External Authentication](external_authorization.md#configuration) | External Classification Policy Authorization |
+| [Web terminal](../../../administration/integration/terminal.md#limiting-websocket-connection-time) | Set max session time for web terminal. |
+| [Web IDE](../../project/web_ide/index.md#enabling-client-side-evaluation) | Manage Web IDE Features. |
+
+## Integrations
+
+| Option | Description |
+| ------ | ----------- |
+| [Elasticsearch](../../../integration/elasticsearch.md#enabling-elasticsearch) | Elasticsearch integration. Elasticsearch AWS IAM. |
+| [PlantUML](../../../administration/integration/plantuml.md#gitlab) | Allow rendering of PlantUML diagrams in Asciidoc documents. |
+| [Slack application](../../../user/project/integrations/gitlab_slack_application.md#configuration) **(FREE ONLY)** | Slack integration allows you to interact with GitLab via slash commands in a chat window. This option is only available on GitLab.com, though it may be [available for self-managed instances in the future](https://gitlab.com/gitlab-org/gitlab/-/issues/28164). |
+| [Third party offers](third_party_offers.md) | Control the display of third party offers. |
+| [Snowplow](../../../telemetry/index.md#enabling-tracking) | Configure the Snowplow integration. |
+| [Amazon EKS](../../project/clusters/add_remove_clusters.md#additional-requirements-for-self-managed-instances-core-only) | Amazon EKS integration allows you to provision EKS clusters from GitLab. |
+
+## Repository
+
+| Option | Description |
+| ------ | ----------- |
+| [Repository mirror](visibility_and_access_controls.md#allow-mirrors-to-be-set-up-for-projects) | Configure repository mirroring. |
+| [Repository storage](../../../administration/repository_storage_types.md#how-to-migrate-to-hashed-storage) | Configure storage path settings. |
+| Repository maintenance | ([Repository checks](../../../administration/repository_checks.md) and [Housekeeping](../../../administration/housekeeping.md)). Configure automatic Git checks and housekeeping on repositories. |
+| [Repository static objects](../../../administration/static_objects_external_storage.md) | Serve repository static objects (e.g. archives, blobs, ...) from an external storage (e.g. a CDN). |
+
+## Templates **(PREMIUM ONLY)**
+
+| Option | Description |
+| ------ | ----------- |
+| [Templates](instance_template_repository.md#configuration) | Set instance-wide template repository. |
+| [Custom project templates](../custom_project_templates.md) | Select the custom project template source group. |
+
+## CI/CD
 
-## GitLab.com Admin Area settings
+| Option | Description |
+| ------ | ----------- |
+| [Continuous Integration and Deployment](continuous_integration.md) | Auto DevOps, runners and job artifacts. |
+| [Required pipeline configuration](continuous_integration.md#required-pipeline-configuration-premium-only) **(PREMIUM ONLY)** | Set an instance-wide auto included [pipeline configuration](../../../ci/yaml/README.md). This pipeline configuration will be run after the project's own configuration. |
+| [Package Registry](continuous_integration.md#package-registry-configuration-premium-only) **(PREMIUM ONLY)**| Settings related to the use and experience of using GitLab's Package Registry. |
 
-Most of the settings under the Admin Area change the behavior of the whole
-GitLab instance. For GitLab.com, the admin settings are available only for the
-GitLab.com administrators, and the parameters can be found on the
-[GitLab.com settings](../../gitlab_com/index.md) documentation.
+## Reporting
+
+| Option | Description |
+| ------ | ----------- |
+| [Spam and Anti-bot Protection](../../../integration/recaptcha.md) | Enable reCAPTCHA or Akismet and set IP limits. For reCAPTCHA, we currently only support [v2](https://developers.google.com/recaptcha/docs/versions). |
+| [Abuse reports](../abuse_reports.md) | Set notification email for abuse reports. |
+
+## Metrics and profiling
+
+| Option | Description |
+| ------ | ----------- |
+| [Metrics - Influx](../../../administration/monitoring/performance/gitlab_configuration.md) | Enable and configure InfluxDB metrics. |
+| [Metrics - Prometheus](../../../administration/monitoring/prometheus/gitlab_metrics.md) | Enable and configure Prometheus metrics. |
+| [Metrics - Grafana](../../../administration/monitoring/performance/grafana_configuration.md#integration-with-gitlab-ui) | Enable and configure Grafana. |
+| [Profiling - Performance bar](../../../administration/monitoring/performance/performance_bar.md#enable-the-performance-bar-via-the-admin-panel) | Enable access to the Performance Bar for a given group. |
+| [Self monitoring](../../../administration/monitoring/gitlab_self_monitoring_project/index.md#creating-the-self-monitoring-project) | Enable or disable instance self monitoring. |
+| [Usage statistics](usage_statistics.md) | Enable or disable version check and usage ping. |
+| [Pseudonymizer data collection](../../../administration/pseudonymizer.md) **(ULTIMATE)** | Enable or disable the Pseudonymizer data collection. |
+
+## Network
+
+| Option | Description |
+| ------ | ----------- |
+| Performance optimization | [Write to "authorized_keys" file](../../../administration/operations/fast_ssh_key_lookup.md#setting-up-fast-lookup-via-gitlab-shell) and [Push event activities limit and bulk push events](push_event_activities_limit.md). Various settings that affect GitLab performance. |
+| [User and IP rate limits](user_and_ip_rate_limits.md) | Configure limits for web and API requests. |
+| [Outbound requests](../../../security/webhooks.md) | Allow requests to the local network from hooks and services. |
+| [Protected Paths](protected_paths.md) | Configure paths to be protected by Rack Attack. |
+| [Incident Management](../../incident_management/index.md) Limits | Configure limits on the number of inbound alerts able to be sent to a project. |
+
+## Geo
+
+| Option | Description |
+| ------ | ----------- |
+| Geo    | Geo allows you to replicate your GitLab instance to other geographical locations. Redirects to **{admin}** **Admin Area >** **{location-dot}** **Geo >** **{settings}** **Settings**, and will no longer be available at **{admin}** **Admin Area >** **{settings}** **Settings >** **{location-dot}** **Geo** in [GitLab 13.0](https://gitlab.com/gitlab-org/gitlab/-/issues/36896). |
+
+## Preferences
+
+| Option | Description |
+| ------ | ----------- |
+| [Email](email.md) | Various email settings. |
+| [Help page](../../../customization/help_message.md) | Help page text and support page url. |
+| [Pages](../../../administration/pages/index.md#custom-domain-verification) | Size and domain settings for static websites |
+| [Real-time features](../../../administration/polling.md) | Change this value to influence how frequently the GitLab UI polls for updates. |
+| [Gitaly timeouts](gitaly_timeouts.md) | Configure Gitaly timeouts. |
+| Localization | [Default first day of the week](../../profile/preferences.md) and [Time tracking](../../project/time_tracking.md#limit-displayed-units-to-hours-core-only). |
+
+NOTE: **Note:**
+You can change the [Default first day of the week](../../profile/preferences.md) for the entire GitLab instance
+in the **Localization** section of **Admin Area > Settings > Preferences**.