diff --git a/.gitlab/CODEOWNERS b/.gitlab/CODEOWNERS
index df65acf634c28b425d4239491eb301cd80515494..52e0c225173a7667896f5e8aea34f4912ed1e3df 100644
--- a/.gitlab/CODEOWNERS
+++ b/.gitlab/CODEOWNERS
@@ -1735,6 +1735,10 @@ lib/api/entities/project_identity.rb
 lib/api/entities/project.rb
 ee/lib/ee/api/entities/project.rb
 
+[Category:Groups & Projects] @gitlab-com/gl-infra/tenant-scale/organizations/groups-and-projects
+app/views/admin/projects/_projects.html.haml
+app/views/admin/groups/_groups_.html.haml
+
 [Compliance] @gitlab-org/software-supply-chain-security/compliance/engineering
 /app/services/audit_events/build_service.rb
 /ee/app/services/ee/audit_events/build_service.rb
diff --git a/.gitlab/ci/rules.gitlab-ci.yml b/.gitlab/ci/rules.gitlab-ci.yml
index 6b53723bc95c698f326c9bdc54ec2d13f89e1d70..5aa3667feb52da9ff4f7349ec66df2e8b04d098c 100644
--- a/.gitlab/ci/rules.gitlab-ci.yml
+++ b/.gitlab/ci/rules.gitlab-ci.yml
@@ -157,6 +157,9 @@
 .if-merge-request-labels-skip-undercoverage: &if-merge-request-labels-skip-undercoverage
   if: '($CI_PIPELINE_SOURCE == "merge_request_event" && $CI_MERGE_REQUEST_EVENT_TYPE != "merge_train") && $CI_MERGE_REQUEST_LABELS =~ /pipeline:skip-undercoverage/'
 
+.if-merge-request-labels-skip-check-deprecated-files: &if-merge-request-labels-skip-check-deprecated-files
+  if: '($CI_PIPELINE_SOURCE == "merge_request_event" && $CI_MERGE_REQUEST_EVENT_TYPE != "merge_train") && $CI_MERGE_REQUEST_LABELS =~ /pipeline:skip-check-deprecated-files/'
+
 .if-merge-request-labels-jh-contribution: &if-merge-request-labels-jh-contribution
   if: '($CI_PIPELINE_SOURCE == "merge_request_event" && $CI_MERGE_REQUEST_EVENT_TYPE != "merge_train") && $CI_MERGE_REQUEST_LABELS =~ /JiHu contribution/'
 
@@ -2712,6 +2715,13 @@
     - <<: *if-default-refs
       changes: *docs-patterns
 
+.static-analysis:rules:check-deprecated-files:
+  rules:
+    - <<: *if-merge-request-labels-skip-check-deprecated-files
+      when: never
+    - <<: *if-merge-request
+      changes: *code-patterns
+
 .semgrep-appsec-custom-rules:rules:
   rules:
     - <<: *if-not-ee
diff --git a/.gitlab/ci/static-analysis.gitlab-ci.yml b/.gitlab/ci/static-analysis.gitlab-ci.yml
index 7f7ebfe67e69c81691ca99e5907c75d7e40483c0..e13b10e6a1ddd88e26a85b717e24add67ea675a7 100644
--- a/.gitlab/ci/static-analysis.gitlab-ci.yml
+++ b/.gitlab/ci/static-analysis.gitlab-ci.yml
@@ -331,3 +331,13 @@ ping-appsec-for-dependency-review:
   script:
     - docker run --interactive --rm "$DEPENDENCY_REVIEW_BOT_CI_REG:latest" -t "$DEPENDENCY_REVIEW_PAT" -p "$CI_PROJECT_ID" -m "$CI_MERGE_REQUEST_IID" -s "$DISABLE_SCORING" -a "$DISABLE_MENTIONS" -c "$DISABLE_COMMENTING"
   allow_failure: true
+
+check-deprecated-files:
+  extends:
+    - .static-analysis-base
+    - .static-analysis:rules:check-deprecated-files
+  variables:
+    USE_BUNDLE_INSTALL: "false"
+    SETUP_DB: "false"
+  script:
+    - scripts/check_deprecated_files.sh
diff --git a/app/views/admin/groups/_group.html.haml b/app/views/admin/groups/_group.html.haml
index 0aca7d3fefbdce43433e663e74db96b2d3370ef3..0342eeae5cc28d77030f679e05cf627cae2af9d9 100644
--- a/app/views/admin/groups/_group.html.haml
+++ b/app/views/admin/groups/_group.html.haml
@@ -1,3 +1,18 @@
+-# STOP! DO NOT EDIT THIS FILE!
+-#
+-# This file is deprecated and scheduled for removal.
+-#
+-# Details:
+-# - Feature Issue: https://gitlab.com/groups/gitlab-org/-/epics/17782
+-# - Owner: @gitlab-com/gl-infra/tenant-scale/organizations/groups-and-projects
+-#
+-# If you ABSOLUTELY MUST edit this file:
+-# 1. Understand the implications of your changes
+-# 2. Follow the deprecated features guidelines: <insert-link>
+-# 3. Request approval from a DRI when creating a merge request
+-#
+-# Thank you!
+
 - group = local_assigns.fetch(:group)
 - remove_form_id = "js-remove-group-#{group.id}-form"
 
diff --git a/app/views/admin/projects/_projects.html.haml b/app/views/admin/projects/_projects.html.haml
index 8120e88a93a9402ccac4c6a01ae882a9d52d741e..34bd88a7977260dc5d157aae8b8138d3331905be 100644
--- a/app/views/admin/projects/_projects.html.haml
+++ b/app/views/admin/projects/_projects.html.haml
@@ -1,3 +1,20 @@
+-# STOP! DO NOT EDIT THIS FILE!
+-#
+-# This file is deprecated and scheduled for removal.
+-#
+-# Details:
+-# - Feature Issue: https://gitlab.com/groups/gitlab-org/-/epics/17782
+-# - Owner: @gitlab-com/gl-infra/tenant-scale/organizations/groups-and-projects
+-#
+-# If you ABSOLUTELY MUST edit this file:
+-# 1. Understand the implications of your changes
+-# 2. Follow the deprecated features guidelines: <insert-link>
+-# 3. Request approval from a DRI when creating a merge request
+-#
+-# Thank you!
+
+-# test modification
+
 .js-projects-list-holder
   - if @projects.any?
     %ul.content-list
diff --git a/danger/check_deprecated_files/Dangerfile b/danger/check_deprecated_files/Dangerfile
new file mode 100644
index 0000000000000000000000000000000000000000..71b7e1f2d68a0d0784ff994fbf9ee9e0b4441775
--- /dev/null
+++ b/danger/check_deprecated_files/Dangerfile
@@ -0,0 +1,12 @@
+# frozen_string_literal: true
+
+skip_label = "pipeline:skip-check-deprecated-files"
+return if helper.mr_labels.include?(skip_label)
+
+script_output = `DANGER=true ./scripts/check_deprecated_files.sh 2>&1`
+script_success = $?.success?
+
+unless script_success
+  message = script_output.gsub(/\e\[[0-9;]*m/, '')
+  warn(message)
+end
diff --git a/deprecations.yml b/deprecations.yml
new file mode 100644
index 0000000000000000000000000000000000000000..15badb6bb1cdfb8039d3dc5cc197f3cfc0689bb1
--- /dev/null
+++ b/deprecations.yml
@@ -0,0 +1,10 @@
+- path: app/views/admin/projects/_projects.html.haml
+  reason: "Ongoing migration to Vue"
+  feature_issue: https://gitlab.com/groups/gitlab-org/-/epics/17782
+  removal_issue: https://gitlab.com/gitlab-org/gitlab/-/issues/549452
+  feature_category: groups_and_projects
+- path: app/views/admin/groups/_groups_.html.haml
+  reason: "Ongoing migration to Vue"
+  feature_issue: https://gitlab.com/groups/gitlab-org/-/epics/17782
+  removal_issue: https://gitlab.com/gitlab-org/gitlab/-/issues/549452
+  feature_category: groups_and_projects
diff --git a/lefthook.yml b/lefthook.yml
index 4e4808cbf77562a666bddd94e109e5121ff525ee..bcd4b8c1f8d608c1e53eb434791ceb8d3d08a5ad 100644
--- a/lefthook.yml
+++ b/lefthook.yml
@@ -151,6 +151,9 @@ pre-push:
     secrets-detection:
       tags: secrets
       run: .lefthook/gitleaks.sh pre-push
+    check-deprecated-files:
+      tags: backend frontend view haml
+      run: scripts/check_deprecated_files.sh
 
   scripts:
     'merge_conflicts':
diff --git a/scripts/check_deprecated_files.sh b/scripts/check_deprecated_files.sh
new file mode 100755
index 0000000000000000000000000000000000000000..72e257e0413ed8c2370a9abfad0ea605373b8ffd
--- /dev/null
+++ b/scripts/check_deprecated_files.sh
@@ -0,0 +1,98 @@
+#!/usr/bin/env bash
+
+BRed='\033[1;31m'
+BCyan='\033[1;36m'
+BGreen='\033[1;32m'
+Color_Off='\033[0m'
+
+DEPRECATION_REGISTRY="deprecations.yml"
+
+if [ ! -f "$DEPRECATION_REGISTRY" ]; then
+    exit 0
+fi
+
+# Determine script environment
+if [ "$DANGER" = "true" ]; then
+    SCRIPT_ENV="danger"
+elif [ -n "$GITLAB_CI" ]; then
+    SCRIPT_ENV="ci"
+else
+    SCRIPT_ENV="local"
+fi
+
+get_changed_files_local() {
+    current_branch=$(git rev-parse --abbrev-ref HEAD)
+    upstream=$(git rev-parse --abbrev-ref --symbolic-full-name @{u} 2>/dev/null)
+
+    if [ $? -eq 0 ] && [ -n "$upstream" ]; then
+        base_branch="$upstream"
+    else
+        base_branch="origin/master"
+    fi
+
+    merge_base=$(git merge-base "$base_branch" HEAD)
+    git diff --name-only --diff-filter=d "${merge_base}..HEAD"
+}
+
+get_changed_files_ci() {
+    base_branch="${CI_MERGE_REQUEST_TARGET_BRANCH_NAME:-${GITHUB_BASE_REF:-${CI_DEFAULT_BRANCH:-master}}}"
+
+    if [ -n "$CI_MERGE_REQUEST_DIFF_BASE_SHA" ]; then
+        git diff --name-only --diff-filter=d "${CI_MERGE_REQUEST_DIFF_BASE_SHA}..HEAD"
+    elif [ -n "$GITHUB_BASE_REF" ]; then
+        git diff --name-only --diff-filter=d "origin/${GITHUB_BASE_REF}..HEAD"
+    else
+        git fetch origin "$base_branch" --depth=50 2>/dev/null || true
+        merge_base=$(git merge-base "origin/$base_branch" HEAD 2>/dev/null || echo "origin/$base_branch")
+        git diff --name-only --diff-filter=d "${merge_base}..HEAD"
+    fi
+}
+
+deprecated_files=$(grep "^[[:space:]]*- path:" "$DEPRECATION_REGISTRY" | sed 's/^[[:space:]]*- path:[[:space:]]*//')
+
+# Get changed files based on environment
+if [ "$SCRIPT_ENV" = "local" ]; then
+    changed_files=$(get_changed_files_local)
+else
+    # Both 'ci' and 'danger' use CI method
+    changed_files=$(get_changed_files_ci)
+fi
+
+deprecated_list=""
+while IFS= read -r file; do
+    if [ -n "$file" ] && grep -qx "$file" <<< "$deprecated_files"; then
+        deprecated_list="${deprecated_list}  ${BRed}• ${file}${Color_Off}\n"
+    fi
+done <<< "$changed_files"
+
+if [ -n "$deprecated_list" ]; then
+    if [ "$SCRIPT_ENV" = "danger" ]; then
+        echo -e "\n**Deprecated files modified:**\n"
+        echo -e "$deprecated_list"
+        echo -e "\n**To proceed:**\n"
+        echo -e "  • Get approval from one of the DRIs specified in [deprecations.yml](https://gitlab.com/gitlab-org/gitlab/-/blob/master/deprecations.yml)"
+        echo -e "  • Add ~\"pipeline:skip-check-deprecated-files\" label to your MR\n"
+    else
+        echo -e "${BRed}━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━${Color_Off}"
+        echo -e "${BRed}⚠️ WARNING: You are pushing changes to deprecated files!  ⚠️${Color_Off}"
+        echo -e "${BRed}━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━${Color_Off}"
+        echo -e "The following deprecated files have been modified:"
+        echo -e "$deprecated_list"
+        echo -e "To proceed with this change:"
+        echo -e "  • Get approval from a DRI (add as reviewer)"
+        echo -e "  • Explain why this change is necessary in your MR"
+        echo
+        echo -e "To bypass this check:"
+        if [ "$SCRIPT_ENV" = "ci" ]; then
+            echo -e "  • Add ${BCyan}~\"pipeline:skip-check-deprecated-files\"${Color_Off} label to your MR"
+        else
+            echo -e "  • Push with: ${BCyan}LEFTHOOK_EXCLUDE=check-deprecated-files git push${Color_Off}"
+        fi
+        echo
+        echo -e "See deprecation details in: ${BGreen}$DEPRECATION_REGISTRY${Color_Off}"
+        echo -e "${BRed}━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━${Color_Off}"
+    fi
+    exit 1
+fi
+
+exit 0