These are the files needed to customize the (Prometheus BOSH release)[https://github.com/cloudfoundry-community/prometheus-boshrelease/].
To use it you need to fork this repository, edit any files you wish to customize and cut a new release:
bosh create release --final --with-tarball
Once the release is created you can upload it to the BOSH director and use it on the prometheus job.
This release is created by extracting the jobs and source from the prometheus bosh release, please see https://github.com/cloudfoundry-community/prometheus-boshrelease/blob/master/LICENSE.