I've a GCP GKE cluster with version '1.22.12-gke.300'. There are around 20 nodes distributed in 4 node pools. The cluster was created a month before and last day I noticed that all of my nodes are rebooted/restarted. When I see the details of the node using command kubectl get nodes, I'm seeing this result (below). The age of all the nodes are 16 or 17 hours.
gke-company-name-gke-clust-company-name-default-n-97c8e50a-d63m Ready <none> 17h v1.22.12-gke.300
gke-company-name-gke-clust-company-name-default-n-97c8e50a-l8zw Ready <none> 17h v1.22.12-gke.300
gke-company-name-gke-clust-company-name-demo-app--d251216f-2uou Ready <none> 16h v1.22.12-gke.300
gke-company-name-gke-clust-company-name-demo-app--d251216f-3mj1 Ready <none> 16h v1.22.12-gke.300
gke-company-name-gke-clust-company-name-demo-app--d251216f-doml Ready <none> 16h v1.22.12-gke.300
gke-company-name-gke-clust-company-name-prod-app--5ae07853-7mwd Ready <none> 17h v1.22.12-gke.300
gke-company-name-gke-clust-company-name-prod-app--5ae07853-gzxy Ready <none> 17h v1.22.12-gke.300
gke-company-name-gke-clust-company-name-prod-app--5ae07853-lgvo Ready <none> 17h v1.22.12-gke.300
gke-company-name-gke-clust-company-name-prod-nifi-fd3e5533-27gf Ready <none> 16h v1.22.12-gke.300
gke-company-name-gke-clust-company-name-prod-nifi-fd3e5533-7r4q Ready <none> 16h v1.22.12-gke.300
gke-company-name-gke-clust-company-name-prod-nifi-fd3e5533-e680 Ready <none> 16h v1.22.12-gke.300
gke-company-name-gke-clust-company-name-prod-nifi-fd3e5533-m2vf Ready <none> 17h v1.22.12-gke.300
gke-company-name-gke-clust-company-name-prod-nifi-fd3e5533-mtvg Ready <none> 17h v1.22.12-gke.300
gke-company-name-gke-clust-company-name-prod-nifi-fd3e5533-mwiy Ready <none> 16h v1.22.12-gke.300
gke-company-name-gke-clust-company-name-prod-nifi-fd3e5533-rwf9 Ready <none> 16h v1.22.12-gke.300
gke-company-name-gke-clust-company-name-prod-nifi-fd3e5533-tqe0 Ready <none> 17h v1.22.12-gke.300
gke-company-name-gke-clust-company-name-prod-nifi-fd3e5533-weai Ready <none> 17h v1.22.12-gke.300
gke-company-name-gke-clust-company-name-prod-nifi-fd3e5533-xmss Ready <none> 16h v1.22.12-gke.300
Is there any way to identify the reason behing this reboot/restart. Because this unexpected reboot caused some issues to my system. I just wanted to identify the reason of these reboots so that I can know that these types of reboots are expected in future.
Any help is appreciated.