Comment 2 for bug 1989380

@racb the steps were:
Have an existing squid proxy and do a release upgrade, or install a fresh version of Ubuntu LTS 22.04 and install squid.
In either case the server ends up with squid 5.2, which has a known memory leak.

We have multiple, highly available, squid proxies for thousands of VMs.
The ones running Ubuntu 20.04.5 LTS (Focal Fossa), have squid 4.10 and have been stable for months, but the one upgraded to 22.04.1 (Jammy Jellyfish) had squid 5.2 which slowly increased the memory it was taking until it had consumed all of the available memory (4GB over about a day) until squid was oomkilled and had to be restarted.

Unfortunately it isn't feasible to provide a sample of the network traffic that generates this failure, but this is a recognised issue with that version of squid.