Imports istio.io/istio/pkg/kube k8s.io/api/core/v1 k8s.io/apimachinery/pkg/apis/meta/v1 k8s.io/client-go/kubernetes k8s.io/client-go/rest k8s.io/client-go/tools/clientcmd Standard library imports context errors fmt io os os/signal path/filepath regexp strings syscall