Real-time updating of topics freezes under high activity

The hockey season is ruined by the COVID, and they are now playing a few random games without audience. Since we do have hosting credits with UpCloud.com, we are pushing to improve the experience using what we got. Now running the 6x vCore 16GB for web_only and 4x vCore 8GB for data, unicorns at 18.

We once again disabled the ratelimiter…

DISCOURSE_MAX_REQS_PER_IP_MODE : none

…which helps, but we still get 429’s from POLLs, that produce the long delay/freeze for the end user. We are going to continue tweaking by increasing the DISCOURSE_REJECT_MESSAGE_BUS_QUEUE_SECONDS.

But before we do that, a question to @sam / staff:

Is there an environtment variable to increase the thresold for extreme load - read only mode -limiter, or can it be disabled completely?