When upgrading from 4.20, openshift should keep the old ulimit values of 1048576 instead of updating them to 1024:1048576

    4.20.0-0.nightly-2025-09-19-231410

    Always

# upgrade from 4.20.z to 4.21

# Create

oc create -f - <<EOF
apiVersion: batch/v1
kind: Job
metadata:
  name: ulimit-check
spec:
  template:
    spec:
      containers:
      - name: ulimit
        image: quay.io/fedora/fedora:42
        command: ["ulimit", "-n"]
      restartPolicy: Never
  backoffLimit: 0
EOF

# Check logs of the container

    1024

    1048576

This seem to break things, specifically,  I have noticed this while testing the Serverless Operator, its kourier-gateway crashes due to its inability to open new sockets even during parallel e2e test runs, not just performance tests)