code: func (kc *kubeClient) getEnvironmentNamespace(envName string) (string, error) {
  	envNS, pres := kc.envMap[envName]
  	if !pres {
  		return "", errs.Errorf("unknown environment: %s", envName)
  	}
  	return envNS, nil
  }
docs: // getEnvironmentNamespace finds a namespace with the corresponding environment name