You recently moved your tool for clearing the cache for Open Graph images for sharing a link from https://developers.kakao.com/docs/cache to https://developers.kakao.com/tool/clear/og.
It is a very nice tool, and while I don’t use it often, I do use it, which is why I had bookmarked the original location. It took me a couple of minutes to find the new location.
Any chance you could add a 301 redirect to your server? It’s the polite thing to do.