Every project has a Server Admin Log. The logs are combined together in a single Server Admin Log that displays logs for all projects, ordered by most recent activity. You can add a log entry in the #wikimedia-labs channel on Freenode by using the following command:
!log <projectname> <message>
It's best to log all changes to the instances in your project. Doing so makes it easier for others to follow your progress, and to more easily join your project and help out.