Module 'icinga2': add documentation

refs #6842

.vagrant-puppet/modules/icinga2/manifests/config.pp

@@ -1,3 +1,25 @@
+# Define: icinga2::config
+#
+#   Provide Icinga 2 configuration file
+#
+# Parameters:
+#
+#   [*source*] - where to take the file from
+#
+# Requires:
+#
+#   icinga2
+#
+# Sample Usage:
+#
+#   icinga2::config { 'constants';
+#     source => 'puppet:///modules/icinga2_dev',
+#   }
+#
+#   Provide configuration file '/etc/icinga2/constants.conf'
+#   from 'puppet:///modules/icinga2_dev/etc/icinga2/constants.conf'
+#   ('/path/to/puppet/modules/icinga2_dev/files/etc/icinga2/constants.conf')
+#
 define icinga2::config ($source) {
   include icinga2
 

.vagrant-puppet/modules/icinga2/manifests/feature.pp

@@ -1,10 +1,22 @@
-define icinga2::feature ($feature = $title) {
+# Define: icinga2::feature
+#
+#   Enable Icinga 2 feature
+#
+# Requires:
+#
+#   icinga2
+#
+# Sample Usage:
+#
+#   icinga2::feature { 'example-feature'; }
+#
+define icinga2::feature {
   include icinga2
 
-  exec { "icinga2-feature-${feature}":
+  exec { "icinga2-feature-${name}":
     path    => '/bin:/usr/bin:/sbin:/usr/sbin',
-    unless  => "readlink /etc/icinga2/features-enabled/${feature}.conf",
-    command => "icinga2-enable-feature ${feature}",
+    unless  => "readlink /etc/icinga2/features-enabled/${name}.conf",
+    command => "icinga2-enable-feature ${name}",
     require => Package['icinga2'],
     notify  => Service['icinga2']
   }

.vagrant-puppet/modules/icinga2/manifests/init.pp

@@ -1,3 +1,16 @@
+# Class: icinga2
+#
+#   This class installs Icinga 2.
+#
+# Requires:
+#
+#   icinga_packages
+#   icinga2::feature
+#
+# Sample Usage:
+#
+#   include icinga2
+#
 class icinga2 {
   include icinga_packages