<p>Auto-Scaling is OFF and Cluster-Upgrade is OFF but still dont know why cluster get restarted today morning. All Nodes got replace/change and All Pods got restarted</p>
<p>Reason is that it got restarted due to node got upgrade from 1.22 to 1.23 version</p>
<p>I have Regular Version in GKE Cluster</p>

<p>You should double-check with Google support (if you have a support plan), but I know from painful experience that if you're running a version of GKE that falls out of support, they may force-upgrade you to keep you within support, even if you have cluster upgrade turned off -- unless you use a maintenance exclusion.</p>
<p>The REGULAR channel release notes are here: <a href="https://cloud.google.com/kubernetes-engine/docs/release-notes-regular" rel="nofollow noreferrer">https://cloud.google.com/kubernetes-engine/docs/release-notes-regular</a></p>
<p>The December 5th one is probably the one that affected you.</p>
