1 files changed, 45 insertions, 0 deletions
diff --git a/tooling/danger/customer_success.rb b/tooling/danger/customer_success.rb
new file mode 100644
index 00000000000..43bdeadd8a4
--- /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