I see this topic Advanced Routing Failover without Scripting - #67 by Chupaka Is it the one you mean?
But it starts in 2020, so spans the v6 to v7 period and is long and inconclusive. This is the problem of not having a properly managed wiki.
It would be good to have a clean version we can all use. I'd like an example with 2 WAN (one primary - ie not load balanced), with no scripting and (hopefully) no connection marks.
Charles