Enable resolved prometheus exporter

cookbooks/networking/recipes/default.rb

@@ -331,6 +331,16 @@
   to "../run/systemd/resolve/stub-resolv.conf"
 end
 
+gem_package "dbus-systemd" do
+  gem_binary node[:ruby][:gem]
+end
+
+prometheus_exporter "resolved" do
+  port 10028
+  user "systemd-resolve"
+  restrict_address_families "AF_UNIX"
+end
+
 hosts = { :inet => [], :inet6 => [] }
 
 search(:node, "networking:interfaces").collect do |n|