That's not really an IPv6 issue, but an ISP issue. My old ISP didn't monitor anything and relies on customers to call them up and explain that their connection is down. Sometimes tell them that their connection to entire towns are down, because they don't know.

I'm fairly fortunate that my ISP not only offers IPv6, but also knows how to run their network. Denmark has plenty of ISP that doesn't provide IPv6, don't know how to run a network or some many cases both.