Significant drop in unrestricted proxies

https://snowflake-broker.torproject.net/metrics looks like the count dropped from 7201 on 2024-09-11 10:17:05 to just 3399 on 2024-09-12 10:17:05.

I suspect this might be related to my recent changes that were included in the last deployment #40383 (closed): !390 (diffs). Apologies if that is the case.

I tested a Snowflake proxy on my VPS with a public IP. The probetest server responds with the answer in 5 seconds most of the time, which means that ICE gathering does get completed and it's not about the timeout. On my own machine (with a restricted NAT) the response time is the same. Could it be different for some proxies with a different NAT?

Could it be related to the new iceGatheringTimeout? Is 10 seconds not enough for the probetest server to gather enough candidates? Should we increase the timeout back? To 25 seconds? Or is there a different explanation?