PDF metrics

for statsd consumption

This is a sample graph that was generated while the branch was on demo:

http://grafana.demo.civilclaims.dsd.io/#/dashboard/elasticsearch/Sample%20timing%20graph

In order for the graph to become even more useful, the app needs to produce more data. To produce this data, this PR should be merged.

Let's get :part_alternation_mark: :dancers: