module-icinga2/manifests/server/features.pp

# Enable Features for Icinga 2
class icinga2::server::features (
  $enabled_features = ['checker', 'notification', 'maillog'],
) {

  # Do some checking
  validate_array($enabled_features)

  # Pass the features arry to the define to loop though
  icinga::server::feature::enables { $enabled_features: }

}