Hm, aprs.fi got a bit overloaded due to a crawler from Alibaba Cloud LLC getting aggressive at 07:47 (blocked it at 08:07). One of those crawlers which don't identify as a crawler but rather uses random regular browser user-agent strings. Blocked all traffic from Alibaba for now. It had started already yesterday and ramped up the query rate in smaller steps, until it suddenly bumped up to hundreds of requests per second.
I wonder if other APRS web sites get this sort of thing a lot, mine does?