Hi!
This is not for the Graphite server, in the default section you have the option to add parameters that should be used by all your pollers. So if all your pollers should use the same authentication, you can add user/pass/ssl in the default section (otherwise you can specify those for each poller distinctivly). Likewise, you can specify different Graphite servers for different pollers or just one single host where all metrics should be sent.
Hope this helps and thanks for the question, I think it's a bit confusing and I'll make sure to add more explicit explanation there in our next release.
