In 7 day's reliability test, kube-apiserver's memory usage keep increasing. Max is over 3GB.
In our 4.12 test result, the kube-apiserver's memory usage was stable around 1.7 GB and not keep increasing. 
I'll redo the test on a 4.12.0 build to see if I can reproduce this issue.

I'll do a longer than 7 days test to see how high the memory can grow up.

About Reliability Test
https://github.com/openshift/svt/tree/master/reliability-v2

4.13.0-0.nightly-2023-03-14-053612

Always

1. Install an AWS cluster with m5.xlarge type
2. Run reliability test for 7 days
Reliability Test Configuration example:
https://github.com/openshift/svt/tree/master/reliability-v2#groups-and-tasks-1
Config used in this test:
admin: 1 user
dev-test: 15 users
dev-prod: 1 user 
3. Use dittybopper dashboard to monitor the kube-apiserver's memory usage

kube-apiserver's memory usage keep increasing. Max is over 3GB

kube-apiserver's memory usage should not keep increasing

413-kube-apiserver-memory.png
413-api-performance-last2d.png - test was stopped on [2023-03-24 04:21:10 UTC]
412-kube-apiserver-memory.png
must-gather.local.525817950490593011.tar.gz - 4.13 cluster's must gather