On the very slim chance you use envoyproxy/envoy-alpine anywhere in your stack, you should know they quietly dropped support for Alpine in favor of Distroless.
To have known about this change, you'd have to have followed every commit to their repo. They sure didn't announce it anywhere else, including on dockerhub where the now-discontinued image lives on, growing increasingly out of date.
Of course switching to distroless isn't really drop in, if you depend on things like HEALTHCHECK