Monkey patch HangoutsChat using a Gitlab::Patch

https://gitlab.com/gitlab-org/gitlab/-/merge_requests/61957#note_588685387

config/initializers/hangouts_chat_http_override.rb

 # frozen_string_literal: true
 
-module HangoutsChat
-  class Sender
-    class HTTP
-      module GitlabHTTPOverride
-        extend ::Gitlab::Utils::Override
-
-        attr_reader :uri
-
-        # see https://github.com/enzinia/hangouts-chat/blob/6a509f61a56e757f8f417578b393b94423831ff7/lib/hangouts_chat/http.rb
-        override :post
-        def post(payload)
-          httparty_response = Gitlab::HTTP.post(
-            uri,
-            body: payload.to_json,
-            headers: { 'Content-Type' => 'application/json' },
-            parse: nil # disables automatic response parsing
-          )
-          httparty_response.response
-          # The rest of the integration expects a Net::HTTP response
-        end
-      end
-
-      prepend GitlabHTTPOverride
-    end
-  end
-end
+HangoutsChat::Sender::HTTP.prepend(Gitlab::Patch::HangoutsChatHTTPOverride)

lib/gitlab/patch/hangouts_chat_http_override.rb

+# frozen_string_literal: true
+
+module Gitlab
+  module Patch
+    module HangoutsChatHTTPOverride
+      attr_reader :uri
+
+      # See https://github.com/enzinia/hangouts-chat/blob/6a509f61a56e757f8f417578b393b94423831ff7/lib/hangouts_chat/http.rb
+      def post(payload)
+        httparty_response = Gitlab::HTTP.post(
+          uri,
+          body: payload.to_json,
+          headers: { 'Content-Type' => 'application/json' },
+          parse: nil # Disables automatic response parsing
+        )
+        httparty_response.response
+        # The rest of the integration expects a Net::HTTP response
+      end
+    end
+  end
+end