Thanks for checking out the New Relic Ruby Agent repository on Github.
The master branch will always follow the latest stable, and development happens on development branches.
Each release is tagged with the release number – i.e. 3.0.0 is tagged the same – branch 3.0.0_dev and tag 3.0.0.
Here’s the New Relic Ruby Agent API Documentation.
Please submit bugs or issues at our support site