Had my first proper busy spike last night and the site crashed, got a load of internal server errors and had lots of these in the logs
2023/01/10 21:20:49 [alert] 127868#127868: *28491671 socket() failed (24: Too many open files) while connecting to upstream
Pretty sure if I had guest page caching still it wouldn't have been as big a problem as it was, first time in 4 years the current server has ever been properly overloaded which I could see coming as soon as Guest page caching was removed. The amount of members and guests connecting to the site at the same time must have been pushing 2,000.
Not sure what I can do now as Cloudflare hasn't helped prevent this (its just set up with default settings, as mentioned earlier in the topic I tried to replicate the guest page cache but it never updated the site for guests for a long time)