Customers wanting to deploy software packages, or updates to those packages, across a group of servers or other computing resources can rely upon a component such as a resource manager to manage the deployment. The resource manager can utilize a data structure that stores deployment information by Revision number, and merges information for each verified deployment into a Mainline for those resources. Each Deployment can involve an Individual Release or a Baseline Release, and the importance of those Releases can be determined with respect to a current snapshot of the Mainline. Such an approach enables important Release and Deployment information to be quickly determined and obtained, which can help with configuring and scheduling future Deployments.