Modification for running in pod

[ralfeus]

Hi.
I'm trying to modify the plugin so it can be ran with fluentd, which runs as daemonset. I'd like to create a pull request once I make it working.
But now I've got a question - where should it log metrics? I expected it to be logged in the fluentd's pod but I saw there only Ruby's error messages. Once I've fixed mentioned errors it logs nothing more.