The metrics subsystem currently resides in the sentry-service-server. So any other module that needs to use it has to depend on sentry-service-server which is causing circular dependencies when trying to add modules used by sentry-service-server.
This will create a sentry-service-metrics that will house and wrap all the metrics needs for the server. It will need to use
SENTRY-2458 as a base to segment out the web presentation components of the metrics. It will also allow for the centralization of the roll up and shading of the codehale metrics package to happen in one sub module rather then split over two.