protected function getHostVarsFilename($inventoryFolder, $hostId)
{
// what are we doing?
$log = usingLog()->startAction("determine host_vars filename for host '{$hostId}'");
// get our ansible settings
$ansibleSettings = fromConfig()->getModuleSetting('ansible');
// get our inventory folder
$invFolder = $this->getInventoryFolder($ansibleSettings, $inventoryFolder);
// what is the path to the file?
$filename = $invFolder . DIRECTORY_SEPARATOR . 'host_vars' . DIRECTORY_SEPARATOR . $hostId;
// all done
$log->endAction("filename is: " . $filename);
return $filename;
}