defer HandleCrash()
		panic("test panic")
	})
	if err != nil {
		t.Fatalf("%v", err)
	}
	// Example log:
	//
	// ...] Observed a panic: test panic
	// goroutine 6 [running]:
	// command-line-arguments.logPanic(0x..., 0x...)
	// 	.../src/k8s.io/kubernetes/staging/src/k8s.io/apimachinery/pkg/util/runtime/runtime.go:69 +0x...
	lines := strings.Split(log, "\n")
	if len(lines) < 4 {

func ApplyClusterMerge(pctx networking.EnvoyFilter_PatchContext, efw *model.EnvoyFilterWrapper,
	c *cluster.Cluster, hosts []host.Name,
) (out *cluster.Cluster) {
	defer runtime.HandleCrash(runtime.LogPanic, func(any) {
		log.Errorf("clusters patch %s/%s caused panic, so the patches did not take effect", efw.Namespace, efw.Name)
		IncrementEnvoyFilterErrorMetric(Cluster)
	})