It became apparent after a discussion with Paul that a helpful feature of toaster would be to automatically check the build results and warn the user if the configuration variables set up in the project aren't correctly reflected in the actual build configuration. Note that this doesn't necessarily reflect an error in Toaster setup of the build process - this change may come from unexpected interactions between layer configuration files, and it is helpful to warn the user about such unexpected interactions.
We will probably display a message in the configuration section of the build dashboard page, and then we need to find a way to show which variables didn't take the expected value. In the variable history, we should also highlight the step where the expected value gets overriden. The design work is connected to the one required for bug 5811
Possibly combine with STIG.