diff --git a/danger/customer_success/Dangerfile b/danger/customer_success/Dangerfile
new file mode 100644
index 0000000000000000000000000000000000000000..a9043e030a13ae045244fa61bfdc201aebddad2b
--- /dev/null
+++ b/danger/customer_success/Dangerfile
@@ -0,0 +1,3 @@
+# frozen_string_literal: true
+
+markdown(customer_success.build_message)
diff --git a/danger/plugins/customer_success.rb b/danger/plugins/customer_success.rb
new file mode 100644
index 0000000000000000000000000000000000000000..dad8174c311fd0cde1d03dbaf71ce4ebcf71403b
--- /dev/null
+++ b/danger/plugins/customer_success.rb
@@ -0,0 +1,9 @@
+# frozen_string_literal: true
+
+require_relative '../../tooling/danger/customer_success'
+
+module Danger
+ class CustomerSuccess < ::Danger::Plugin
+ include Tooling::Danger::CustomerSuccess
+ end
+end
diff --git a/spec/tooling/danger/customer_success_spec.rb b/spec/tooling/danger/customer_success_spec.rb
new file mode 100644
index 0000000000000000000000000000000000000000..798905212f199e48e9b2becce6f23151e5cddff1
--- /dev/null
+++ b/spec/tooling/danger/customer_success_spec.rb
@@ -0,0 +1,91 @@
+# frozen_string_literal: true
+
+require 'rspec-parameterized'
+require 'gitlab-dangerfiles'
+require 'gitlab/dangerfiles/spec_helper'
+require_relative '../../../tooling/danger/customer_success'
+
+RSpec.describe Tooling::Danger::CustomerSuccess do
+ include_context "with dangerfile"
+
+ let(:fake_danger) { DangerSpecHelper.fake_danger.include(described_class) }
+ let(:customer_success) { fake_danger.new(helper: fake_helper) }
+
+ describe 'customer success danger' do
+ using RSpec::Parameterized::TableSyntax
+
+ where do
+ {
+ 'with data category changes to Ops and no Customer Success::Impact Check label' => {
+ modified_files: %w(config/metrics/20210216182127_user_secret_detection_jobs.yml app/models/user.rb),
+ changed_lines: ['-data_category: cat1', '+data_category: operational'],
+ customer_labeled: false,
+ impacted: true,
+ impacted_files: %w(config/metrics/20210216182127_user_secret_detection_jobs.yml)
+ },
+ 'with data category changes and Customer Success::Impact Check label' => {
+ modified_files: %w(config/metrics/20210216182127_user_secret_detection_jobs.yml),
+ changed_lines: ['-data_category: cat1', '+data_category: operational'],
+ customer_labeled: true,
+ impacted: false,
+ impacted_files: %w(config/metrics/20210216182127_user_secret_detection_jobs.yml)
+ },
+ 'with metric file changes and no data category changes' => {
+ modified_files: %w(config/metrics/20210216182127_user_secret_detection_jobs.yml),
+ changed_lines: ['-product_stage: growth'],
+ customer_labeled: false,
+ impacted: false,
+ impacted_files: []
+ },
+ 'with data category changes from Ops' => {
+ modified_files: %w(config/metrics/20210216182127_user_secret_detection_jobs.yml app/models/user.rb),
+ changed_lines: ['-data_category: operational', '+data_category: cat2'],
+ customer_labeled: false,
+ impacted: true,
+ impacted_files: %w(config/metrics/20210216182127_user_secret_detection_jobs.yml)
+ },
+ 'with data category removed' => {
+ modified_files: %w(config/metrics/20210216182127_user_secret_detection_jobs.yml app/models/user.rb),
+ changed_lines: ['-data_category: operational'],
+ customer_labeled: false,
+ impacted: true,
+ impacted_files: %w(config/metrics/20210216182127_user_secret_detection_jobs.yml)
+ },
+ 'with data category added' => {
+ modified_files: %w(config/metrics/20210216182127_user_secret_detection_jobs.yml app/models/user.rb),
+ changed_lines: ['+data_category: operational'],
+ customer_labeled: false,
+ impacted: true,
+ impacted_files: %w(config/metrics/20210216182127_user_secret_detection_jobs.yml)
+ },
+ 'with data category in uppercase' => {
+ modified_files: %w(config/metrics/20210216182127_user_secret_detection_jobs.yml app/models/user.rb),
+ changed_lines: ['+data_category: Operational'],
+ customer_labeled: false,
+ impacted: true,
+ impacted_files: %w(config/metrics/20210216182127_user_secret_detection_jobs.yml)
+ }
+ }
+ end
+
+ with_them do
+ before do
+ allow(fake_helper).to receive(:modified_files).and_return(modified_files)
+ allow(fake_helper).to receive(:changed_lines).and_return(changed_lines)
+ allow(fake_helper).to receive(:has_scoped_label_with_scope?).and_return(customer_labeled)
+ allow(fake_helper).to receive(:markdown_list).with(impacted_files)
+ .and_return(impacted_files.map { |item| "* `#{item}`" }.join("\n"))
+ end
+
+ it 'generates correct message' do
+ expect(customer_success.build_message).to match_expected_message
+ end
+ end
+ end
+
+ def match_expected_message
+ return be_nil unless impacted
+
+ start_with(described_class::CHANGED_SCHEMA_MESSAGE).and(include(*impacted_files))
+ end
+end
diff --git a/tooling/danger/customer_success.rb b/tooling/danger/customer_success.rb
new file mode 100644
index 0000000000000000000000000000000000000000..43bdeadd8a435341952be0f0a97e5f6f5cfc2af7
--- /dev/null
+++ b/tooling/danger/customer_success.rb
@@ -0,0 +1,45 @@
+# frozen_string_literal: true
+
+module Tooling
+ module Danger
+ module CustomerSuccess
+ CHANGED_SCHEMA_MESSAGE = <<~MSG
+ Notification to the Customer Success about changes to files with possible breaking downstream processes, add label `Customer Success::Impact Check`.
+
+ /label ~"Customer Success::Impact Check"
+
+ The following files require a review:
+ MSG
+
+ FILE_PATH_REGEX = %r{((ee|jh)/)?config/metrics/.+\.yml}.freeze
+ CATEGORY_CHANGED = /data_category: operational/i.freeze
+
+ def build_message
+ return unless impacted?
+
+ CHANGED_SCHEMA_MESSAGE + helper.markdown_list(impacted_files)
+ end
+
+ private
+
+ def impacted?
+ !helper.has_scoped_label_with_scope?('Customer Success') && impacted_files.any?
+ end
+
+ def impacted_files
+ @impacted_files ||=
+ metric_files.select do |file|
+ helper.changed_lines(file).any? { |change| metric_category_changed?(change) }
+ end.compact
+ end
+
+ def metric_files
+ helper.modified_files.grep(FILE_PATH_REGEX)
+ end
+
+ def metric_category_changed?(change)
+ change =~ CATEGORY_CHANGED
+ end
+ end
+ end
+end