Add PowerDNS Recursor input plugin (#4545)

etc/telegraf.conf

@@ -3346,6 +3346,20 @@
 #   unix_sockets = ["/var/run/pdns.controlsocket"]
 
 
+# # Read metrics from one or many PowerDNS recursors
+# [[inputs.powerdns_recursor]]
+#   ## An array of sockets to gather stats about.
+#   ## Specify a path to unix socket.
+#   ##
+#   ## If no servers are specified, then '/var/run/pdns_recursor.controlsocket' is used as the path.
+#   unix_sockets = ["/var/run/pdns_recursor.controlsocket"]
+#
+#   ## Socket for Receive
+#   # socket_dir = "/var/run/"
+#   ## Socket permissions
+#   # socket_mode = "0666"
+
+
 # # Monitor process cpu and memory usage
 # [[inputs.procstat]]
 #   ## PID file to monitor process