service_is internal metrics

[evdevk]

I set up
graphite_addr = "localhost:40004"
graphite_interval = 10000 # in ms

40004 is a socket listener. I am expecting all internal metrics are goes to socket but it seems like^
prefix carbon-relay-ng.stats. goes through graphite_addr
prefix service_is_carbon-relay-ng. goes directrly to the routes

is it true? is so why and is it possible to push service_is_carbon-relay-ng.<instance> to the **graphite_addr**