code: func (runtime *DockerRuntime) ListKubeContainers() ([]string, error) {
  	output, err := runtime.exec.Command("docker", "ps", "-a", "--filter", "name=k8s_", "-q").CombinedOutput()
  	return strings.Fields(string(output)), err
  }
docs: // ListKubeContainers lists running k8s containers