code: func (pr execProber) Probe(e exec.Cmd) (probe.Result, string, error) {
  	data, err := e.CombinedOutput()
  	klog.V(4).Infof("Exec probe response: %q", string(data))
  	if err != nil {
  		exit, ok := err.(exec.ExitError)
  		if ok {
  			if exit.ExitStatus() == 0 {
  				return probe.Success, string(data), nil
  			}
  			return probe.Failure, string(data), nil
  		}
  		return probe.Unknown, "", err
  	}
  	return probe.Success, string(data), nil
  }
docs: // Probe executes a command to check the liveness/readiness of container
  // from executing a command. Returns the Result status, command output, and
  // errors if any.