I agree that there are a class of problems that you simply will not find on canary environments, but most of the places I have been will run their smoke suite i

I agree that there are a class of problems that you simply will not find on canary environments, but most of the places I have been will run their smoke suite independent of the actual service. A problem of this type, e.g. core to your SLA/SLO, shouldn't be tested on the live production deployment. An alternative would be creating a dummy ticker and playing fake data, but even that is dangerous on a live exchange.