Hugo reports that OVH is having some service degradation, which means masto.host is having some service degradation, which means artisan.chat is having some service degradation.
So far no actual outages that I've seen (though other MastoHosties are having some), since we're kind of overprovisioned. Our background queues are backing up, though, so things are taking extra time to get delivered, timelines are slow to update, etc.
Hugo's keeping an eye on it for us.
18:14EST Update: OVH has rolled out a fix and our queues are dropping back to zero.