add hugepages plugin

In collectd 5.7, the hugepage plugin have been added.

This change adds its support in puppet-collectd

manifests/plugin/hugepages.pp

@@ -0,0 +1,59 @@
+#== Class: collectd::plugin::hugepages
+#
+# Class to manage hugepages write plugin for collectd
+#
+# Documentation:
+#   https://collectd.org/documentation/manpages/collectd.conf.5.shtml#plugin_hugepages
+#
+# === Parameters
+#
+# [*ensure*]
+#  Ensure param for collectd::plugin type.
+#  Defaults to 'ensure'
+#
+# [*interval*]
+#  Interval setting for the plugin
+#  Defaults to undef
+#
+# [*report_per_node_hp*]
+#  If enabled, information will be collected from the hugepage counters in
+#  "/sys/devices/system/node/*/hugepages". This is used to check the per-node
+#  hugepage statistics on a NUMA system.
+#  Defaults to true
+#
+# [*report_root_hp*]
+#  If enabled, information will be collected from the hugepage counters in
+#  "/sys/kernel/mm/hugepages". This can be used on both NUMA and non-NUMA
+#  systems to check the overall hugepage statistics.
+#  Defaults to true
+#
+# [*values_pages*]
+#  Whether to report hugepages metrics in number of pages
+#  Defaults to true
+#
+# [*values_bytes*]
+#  Whether to report hugepages metrics in bytes
+#  Defaults to false
+#
+# [*values_percentage*]
+#  Whether to report hugepages metrics in percentage
+#  Defaults to false
+#
+class collectd::plugin::hugepages (
+  Enum['present', 'absent'] $ensure   = 'present',
+  Optional[Integer] $interval         = undef,
+  Boolean $report_per_node_hp         = true,
+  Boolean $report_root_hp             = true,
+  Boolean $values_pages               = true,
+  Boolean $values_bytes               = false,
+  Boolean $values_percentage          = false,
+) {
+
+  include collectd
+
+  collectd::plugin { 'hugepages':
+    ensure   => $ensure,
+    interval => $interval,
+    content  => epp('collectd/plugin/hugepages.conf.epp'),
+  }
+}

spec/classes/collectd_plugin_hugepages_spec.rb

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+require 'spec_helper'
+
+describe 'collectd::plugin::hugepages', type: :class do
+  on_supported_os(baseline_os_hash).each do |os, facts|
+    context "on #{os} " do
+      let :facts do
+        facts
+      end
+
+      options = os_specific_options(facts)
+      context 'default' do
+        it 'defaults' do
+          content = <<EOS
+# Generated by Puppet
+<LoadPlugin hugepages>
+  Globals false
+</LoadPlugin>
+
+<Plugin "hugepages">
+  ReportPerNodeHP true
+  ReportRootHP true
+  ValuesPages true
+  ValuesBytes false
+  ValuesPercentage false
+</Plugin>
+
+EOS
+
+          is_expected.to compile.with_all_deps
+          is_expected.to contain_file('hugepages.load').with(
+            content: content,
+            path: "#{options[:plugin_conf_dir]}/10-hugepages.conf"
+          )
+        end
+      end
+
+      options = os_specific_options(facts)
+      context 'all set' do
+        let :params do
+          {
+            'report_per_node_hp' => false,
+            'report_root_hp'     => false,
+            'values_pages'       => false,
+            'values_bytes'       => true,
+            'values_percentage'  => true
+          }
+        end
+
+        it 'overrides defaults' do
+          content = <<EOS
+# Generated by Puppet
+<LoadPlugin hugepages>
+  Globals false
+</LoadPlugin>
+
+<Plugin "hugepages">
+  ReportPerNodeHP false
+  ReportRootHP false
+  ValuesPages false
+  ValuesBytes true
+  ValuesPercentage true
+</Plugin>
+
+EOS
+
+          is_expected.to compile.with_all_deps
+          is_expected.to contain_class('collectd')
+          is_expected.to contain_file('hugepages.load').with(
+            content: content,
+            path: "#{options[:plugin_conf_dir]}/10-hugepages.conf"
+          )
+        end
+      end
+    end
+  end
+end

templates/plugin/hugepages.conf.epp

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+<Plugin "hugepages">
+  ReportPerNodeHP <%= $collectd::plugin::hugepages::report_per_node_hp %>
+  ReportRootHP <%= $collectd::plugin::hugepages::report_root_hp %>
+  ValuesPages <%= $collectd::plugin::hugepages::values_pages %>
+  ValuesBytes <%= $collectd::plugin::hugepages::values_bytes %>
+  ValuesPercentage <%= $collectd::plugin::hugepages::values_percentage %>
+</Plugin>