[Feature Request] Aggregate by exception

I don't know if this is the right place to do this, but I'd love a way of aggregating failures by exception type, message, or error line. In a large codebase, a small change can generate a cascade of failures that actually are only down to errors in one or two places. It would be really helpful to be able to see that although 50 tests failed, 40 of them were from a db connectivity error and the other 10 arose from the same error in a utility function.

The alternative would be to tackle it at the CLI level, but I like the idea of being able to dynamically aggregate by different views to work out what's going on.

Happy to aid in the development if this would be a welcome feature.