feat: setup metrics agents

- set puppet::puppetdb_api class to export puppetdb
- set infra::dns::server class to export bind
- set all to export node and systemd metrics

site/profiles/manifests/dns/server.pp

@@ -17,11 +17,15 @@ class profiles::dns::server (
 
   # setup base bind server
   class { 'bind':
-      forwarders => $use_forwarders,
-      dnssec     => $dnssec,
-      version    => 'Controlled by Puppet',
+      forwarders      => $use_forwarders,
+      dnssec          => $dnssec,
+      version         => 'Controlled by Puppet',
+      statistics_port => '8053',
   }
 
+  # setup bind_exporter
+  include prometheus::bind_exporter
+
   # if keys, import them
   $keys.each | $name, $data | {
     bind::key { $name: