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+# This is a template for announcing a feature removal or other important change.
+#
+# Please refer to the deprecation guidelines to confirm your understanding of GitLab's definitions.
+# https://docs.gitlab.com/ee/development/deprecation_guidelines/#terminology
+#
+# If this is a breaking change, it must happen in a major release.
+#
+# For more information please refer to the handbook documentation here:
+# https://about.gitlab.com/handbook/marketing/blog/release-posts/#deprecations-and-other-planned-breaking-change-announcements
+#
+# Please delete this line and above before submitting your merge request.
+#
+# REQUIRED FIELDS
+#
+- title: "CAS OmniAuth provider is removed"  # (required) Clearly explain the change. For example, "The `confidential` field for a `Note` is removed" or "CI/CD job names are limited to 250 characters."
+  announcement_milestone: "15.3"  # (required) The milestone when this feature was deprecated.
+  removal_milestone: "16.0"  # (required) The milestone when this feature is being removed.
+  breaking_change: true  # (required) Change to false if this is not a breaking change.
+  reporter: jessieay  # (required) GitLab username of the person reporting the removal
+  stage: Manage  # (required) String value of the stage that the feature was created in. e.g., Growth
+  issue_url: https://gitlab.com/gitlab-org/gitlab/-/issues/369127  # (required) Link to the deprecation issue in GitLab
+  body: |  # (required) Do not modify this line, instead modify the lines below.
+    The `omniauth-cas3` gem that provides GitLab with the CAS OmniAuth provider is being removed. You can no longer authenticate into a GitLab instance through CAS. This gem sees very little use. [The gem](https://rubygems.org/gems/omniauth-cas3/) has not had a new release in almost 5 years, which means that its dependencies are out of date and required manual patching during GitLab's [upgrade to OmniAuth 2.0](https://gitlab.com/gitlab-org/gitlab/-/issues/30073).