It seems like running a pictrs server is optional when running Lemmy. I'm trying to figure out if a given instance supports pictrs.

I see in the documentation for pictrs, there is a GET /healthz endpoint. However when I try to access https://lemmy.ml/pictrs/healthz for example it gives me a 404. Even tho I know that Lemmy.ml has a pictrs server.

What is the best way to determine if a Lemmy server has pictrs?