Query your Kubernetes cluster for images and check if they're outdated. Remember your developers to rebuild and redeploy their applications (based on your periodically updated base images) if the build timestamps of the currently deployed container images are older than a specified amount of time.
./k8s-find-outdated-images -v find --context kind-kind --age 0h --filter type=workload --email email -o result.json
go build
go test
go run . -v find --context kind-kind --age 3d --filter type=workload --email email