Quoting @niemeyer from above (nobody ever talked about “hours” in this thread)
No update of any of the official packages ever goes into stable without a testing period in the beta and/or candidate channels (there is a whole QA team working on that). The simple solution is to have a device (or a few) that you monitor via software, that are on the beta channel and that notify you when something breaks … You could go as far as having your monitoring tool automatically delay the upgrades of your stable devices if your automated function-tests fail.
Additionally report a bug about the found regression so that the release into stable will be held back … (this is indeed automatable as well … )
Alternatively to that you can surely have Canonicals QA team do the above checks on your hardware directly as part of a release test as a paid-for commercial option (at least: if we dont offer such a service yet, it is about time we do 
)