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Well Traefik just upgraded to v3 and broke all existing legacy syntax with v2.
I'm sure there's some good technical reasoning behind such a move but as a user this is absolutely a horrible experience. There's a flag to enable v2 syntax mode, but you know what there isn’t? A single one pager saying if you have X in v2, you need Y in v3.
I don't want to have to go spelunking for hours figuring out your new way of doing things just to get back to where I was yesterday.

I have over 20 instances of traefik deployed all over the place and this is going to be a big time sink. So, thanks? I guess?

I'm just trying to imagine a world where nginx or haproxy deliberately break ALL existing deployments. Total madness.