This is my first post and I thought it should have some value
I have written a simple command line tool which allows to fetch a bunch of Graylog metrics off the Graylog API, add some meta-data and custom information and then spit it out as JSON. There is also an option to feed it back to Graylog using a tcp/raw input, so you can easily build up a dashboard or forward it to other tools like Elasticsearch, MongoDB.
You find the tool here:
Have some fun!
I hope you enjoy it.