By default, shutdownGracePeriod and shutdownGracePeriodCriticalPods are set to 0. (https://56770--docspreview.netlify.app/openshift-enterprise/latest/nodes/nodes/nodes-nodes-graceful-shutdown.html#nodes-nodes-grace-periods-graceful-shutdown_nodes-nodes-graceful-shutdown) 

But these configuration doesn't exist in /etc/kubernetes/kubelet.conf by default.

% oc get clusterversionNAME   VERSION                           AVAILABLE   PROGRESSING   SINCE   STATUSversion   4.13.0-0.nightly-2023-03-28-014156   True     False      98m  Cluster version is 4.13.0-0.nightly-2023-03-28-014156

always

1.oc debug node and check if shutdownGracePeriod and shutdownGracePeriodCriticalPods are included in the file /etc/kubernetes/kubelet.conf
2.
3.

1 the shutdownGracePeriod and shutdownGracePeriodCriticalPods are not included in /etc/kubernetes/kubelet.conf

oc debug node/worker-0 
...
sh-4.4# chroot /host   
sh-5.1# cat /etc/kubernetes/kubelet.conf 
kind: KubeletConfiguration
apiVersion: kubelet.config.k8s.io/v1beta1
authentication:
  x509:
    clientCAFile: /etc/kubernetes/kubelet-ca.crt
  anonymous:
    enabled: false
cgroupDriver: systemd
cgroupRoot: /
clusterDNS:
  - 172.30.0.10
clusterDomain: cluster.local
containerLogMaxSize: 50Mi
maxPods: 250
kubeAPIQPS: 50
kubeAPIBurst: 100
podPidsLimit: 4096
protectKernelDefaults: true
rotateCertificates: true
serializeImagePulls: false
staticPodPath: /etc/kubernetes/manifests
systemCgroups: /system.slice
featureGates:
  APIPriorityAndFairness: true
  RotateKubeletServerCertificate: true
  DownwardAPIHugePages: true
  OpenShiftPodSecurityAdmission: true
  RetroactiveDefaultStorageClass: false
  RotateKubeletServerCertificate: true
serverTLSBootstrap: true
tlsMinVersion: VersionTLS12
tlsCipherSuites:
  - TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256
  - TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256
  - TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384
  - TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384
  - TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256
  - TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256
sh-5.1# 

1 the shutdownGracePeriod and shutdownGracePeriodCriticalPods are included in /etc/kubernetes/kubelet.conf, and set to 0 by default.