https://msdn.microsoft.com/en-us/library/microsoft.sqlserver.management.smo.server.aspx

Currently: databases, backup devices, server level triggers, end points, SQL Agent properties, jobs, linked servers, logins, alerts, and operators. There is so much more it could be scripting to be a complete solution, and I need to go back and flesh this out even more. The Git repository contains folders based on server name and then beneath each server are folders for each object type, having one separate .sql script for each object.

In addition to being a comprehensive versioned archive of what's currently in (or has been) in production, from a monitoring and auditing perspective it can also be used to keep tabs on changes (planned or unplanned), because each commit represents some type of modification to an object since the last time the PowerShell job ran, which is scheduled nightly.