I'm trying to figure out how to emit a configuration file for jmxtrans. The 
config is json, the values I need to fill in are known by ansible, but I'm 
having a hell of a time building up the dict structure and dumping to json 
using the template module's to_json filter.

The simple explanation is that I'd like to loop over a list of servers from 
an inventory group, copy a few dictionaries from a vars file thereby 
building up a completely new dict and then dump that to a json file that 
jmxtrans uses for configuration.

If I had a way to turn on extension, I could do all of this in jinja2:
https://gist.github.com/davidbirdsong/9355702

I keep needing to be able to turn on extensions and take that as an 
indicator that I'm doing it the wrong way. Perhaps I am? Is there a more 
ansible-native way to loop on data and create new structures at play-time?

Here's my vars.yml file: https://gist.github.com/davidbirdsong/9355770

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