On large clusters, CNO uses gigabytes of memory. This is absurd.
One of the problems is that it watches all daemonsets, deployments, and stateful sets. There are probably some other bad watches in there too.
verified this bug.
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory (Important: OpenShift Container Platform 4.11.0 bug fix and security update), and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.