Rename supported operating systems and add note for Alma

doc/administration/pages/index.md

@@ -1281,7 +1281,7 @@ in all of your GitLab Pages instances.
 
 ### 500 error with `securecookie: failed to generate random iv` and `Failed to save the session`
 
-This problem most likely results from an [out-dated operating system](../package_information/deprecated_os.md).
+This problem most likely results from an [out-dated operating system](../package_information/supported_os.md#os-versions-that-are-no-longer-supported).
 The [Pages daemon uses the `securecookie` library](https://gitlab.com/search?group_id=9970&project_id=734943&repository_ref=master&scope=blobs&search=securecookie&snippets=false) to get random strings via [`crypto/rand` in Go](https://golang.org/pkg/crypto/rand/#pkg-variables).
 This requires the `getrandom` system call or `/dev/urandom` to be available on the host OS.
 Upgrading to an [officially supported operating system](https://about.gitlab.com/install/) is recommended.

doc/install/requirements.md

@@ -35,7 +35,7 @@ For the installation options, see [the main installation page](index.md).
 Installation of GitLab on these operating systems is possible, but not supported.
 Please see the [installation from source guide](installation.md) and the [installation guides](https://about.gitlab.com/install/) for more information.
 
-Please see [OS versions that are no longer supported](../administration/package_information/deprecated_os.md) for Omnibus installs page
+Please see [OS versions that are no longer supported](../administration/package_information/supported_os.md#os-versions-that-are-no-longer-supported) for Omnibus installs page
 for a list of supported and unsupported OS versions as well as the last support GitLab version for that OS.
 
 ### Microsoft Windows

doc/update/package/index.md

@@ -188,7 +188,7 @@ For the GitLab Community Edition, replace `gitlab-ee` with
 
 ### GitLab 13.7 and later unavailable on Amazon Linux 2
 
-Amazon Linux 2 is not an [officially supported operating system](../../administration/package_information/deprecated_os.md#supported-operating-systems).
+Amazon Linux 2 is not an [officially supported operating system](../../administration/package_information/supported_os.md).
 However, in past the [official package installation script](https://packages.gitlab.com/gitlab/gitlab-ee/install)
 installed the `el/6` package repository if run on Amazon Linux. From GitLab 13.7, we no longer
 provide `el/6` packages so administrators must run the [installation script](https://packages.gitlab.com/gitlab/gitlab-ee/install)

doc/update/plan_your_upgrade.md

@@ -18,7 +18,7 @@ General notes:
   to create your plan, share details of your architecture, including:
   - How is GitLab installed?
   - What is the operating system of the node?
-    (check [OS versions that are no longer supported](../administration/package_information/deprecated_os.md) to confirm that later updates are available).
+    (check [OS versions that are no longer supported](../administration/package_information/supported_os.md#os-versions-that-are-no-longer-supported) to confirm that later updates are available).
   - Is it a single-node or a multi-node setup? If multi-node, share any architectural details about each node with us.
   - Are you using [GitLab Geo](../administration/geo/index.md)? If so, share any architectural details about each secondary node.
   - What else might be unique or interesting in your setup that might be important for us to understand?
@@ -112,7 +112,7 @@ to your instance and then upgrade it for any relevant features you're using.
   - [Determine what upgrade path](index.md#upgrade-paths) to follow.
   - Account for any [version-specific update instructions](index.md#version-specific-upgrading-instructions).
   - Account for any [version-specific changes](package/index.md#version-specific-changes).
-  - Check the [OS compatibility with the target GitLab version](../administration/package_information/deprecated_os.md).
+  - Check the [OS compatibility with the target GitLab version](../administration/package_information/supported_os.md).
 - Due to background migrations, plan to pause any further upgrades after upgrading
   to a new major version.
   [All migrations must finish running](index.md#checking-for-background-migrations-before-upgrading)

doc/user/project/import/index.md

@@ -76,7 +76,7 @@ a self-managed instance from an old server to a new server.
 
 The backups produced don't depend on the operating system running GitLab. You can therefore use
 the restore method to switch between different operating system distributions or versions, as long
-as the same GitLab version [is available for installation](../../../administration/package_information/deprecated_os.md).
+as the same GitLab version [is available for installation](../../../administration/package_information/supported_os.md).
 
 To instead merge two self-managed GitLab instances together, use the instructions in
 [Migrate from self-managed GitLab to GitLab.com](#migrate-from-self-managed-gitlab-to-gitlabcom).