Remove deprecated page

Remove page of deprecated variables.

doc/ci/README.md

@@ -221,11 +221,3 @@ been necessary. These are:
 #### 10.0
 
 - No breaking changes.
-
-#### 9.0
-
-- [CI variables renaming for GitLab 9.0](variables/deprecated_variables.md#gitlab-90-renamed-variables). Read about the
-  deprecated CI variables and what you should use for GitLab 9.0+.
-- [New CI job permissions model](../user/project/new_ci_build_permissions_model.md).
-  See what changed in GitLab 8.12 and how that affects your jobs.
-  There's a new way to access your Git submodules and LFS objects in jobs.

doc/ci/variables/deprecated_variables.md

 ---
-stage: Verify
-group: Continuous Integration
-info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#assignments
-type: reference
+redirect_to: 'README.md'
 ---
 
-# Deprecated GitLab CI/CD variables
+This documentation page was removed. For information about variables, see [GitLab CI/CD environment variables](README.md)
 
-Read through this document to learn what predefined variables
-were deprecated and their new references.
-
-## GitLab 9.0 renamed variables
-
-To follow conventions of naming across GitLab, and to further move away from the
-`build` term and toward `job`, some [CI/CD environment variables](README.md#predefined-environment-variables) were renamed for GitLab 9.0
-release.
-
-Starting with GitLab 9.0, we have deprecated the `$CI_BUILD_*` variables. **You are
-strongly advised to use the new variables as we might remove the old ones in
-future GitLab releases.**
-
-| 8.x name              | 9.0+ name               |
-| --------------------- |------------------------ |
-| `CI_BUILD_BEFORE_SHA` | `CI_COMMIT_BEFORE_SHA`  |
-| `CI_BUILD_ID`         | `CI_JOB_ID`             |
-| `CI_BUILD_MANUAL`     | `CI_JOB_MANUAL`         |
-| `CI_BUILD_NAME`       | `CI_JOB_NAME`           |
-| `CI_BUILD_REF`        | `CI_COMMIT_SHA`         |
-| `CI_BUILD_REF_NAME`   | `CI_COMMIT_REF_NAME`    |
-| `CI_BUILD_REF_SLUG`   | `CI_COMMIT_REF_SLUG`    |
-| `CI_BUILD_REPO`       | `CI_REPOSITORY_URL`     |
-| `CI_BUILD_STAGE`      | `CI_JOB_STAGE`          |
-| `CI_BUILD_TAG`        | `CI_COMMIT_TAG`         |
-| `CI_BUILD_TOKEN`      | `CI_JOB_TOKEN`          |
-| `CI_BUILD_TRIGGERED`  | `CI_PIPELINE_TRIGGERED` |
+<!-- This redirect file can be deleted after 2021-04-14. -->
+<!-- Before deletion, see: https://docs.gitlab.com/ee/development/documentation/#move-or-rename-a-page -->

doc/ci/variables/predefined_variables.md

@@ -14,9 +14,6 @@ Some of the predefined environment variables are available only if a minimum
 version of [GitLab Runner](https://docs.gitlab.com/runner/) is used. Consult the table below to find the
 version of GitLab Runner that's required.
 
-In GitLab 9.0, some [variable were deprecated](deprecated_variables.md#gitlab-90-renamed-variables).
-You should ensure you are using the latest variables.
-
 You can add a command to your `.gitlab-ci.yml` file to
 [output the values of all variables available for a job](README.md#list-all-environment-variables).