Undercloud installation failed because of failure to set kernel.nmi_watchdog on a KVM guest

Issue

• The Director node is an KVM guest.

• There is a configuration to set kernel.nmi_watchdog.

  $ grep custom_env  undercloud.conf 
  custom_env_files=/home/stack/custom-undercloud-params.yaml
  
  $ cat custom-undercloud-params.yaml 
  parameter_defaults: 
    ExtraSysctlSettings:
      kernel.nmi_watchdog:
        value: 0
  

• Undercloud installation failed.

  $ openstack undercloud install
    :
  | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ State Information ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  | ~~~~~~~~~~~~~~~~~~ Number of nodes which did not deploy successfully: 1 ~~~~~~~~~~~~~~~~~
  |  The following node(s) had failures: undercloud
  | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  Exception: Deployment failed
  Traceback (most recent call last):
    File "/usr/lib/python3.6/site-packages/tripleoclient/v1/tripleo_deploy.py", line 1345, in _standalone_deploy
      raise exceptions.DeploymentError('Deployment failed')
  tripleoclient.exceptions.DeploymentError: Deployment failed
  None
  Install artifact is located at /home/stack/builddir/undercloud-install-20211027062427.tar.bzip2
  
  !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
  
  Deployment Failed!
  
  ERROR: Heat log files: /var/log/heat-launcher/undercloud_deploy-y49cken3
    :