This library tries to abstract the features of StatsD, so we have a common interface even though we want to change the library underneath (StatsD at this point).
Just bind the common interface to the implementation that you want to use
bind(Metrics.class).to(NonBlockingStatsDClient.class).asEagerSingleton();
This module provides a test double for the Metrics interface, so that if you want to test classes that depend on this component, you don't need to create your own stub.