I've never built a Rails app, so perhaps there's something simple that I'm missing (I'm mostly a C# guy), but how would I use Skylight to monitor my on-premise application? The pricing makes it seems like a hosted service. I would have expected some sort of profiler to be needed on the server and then perhaps a centralized location for the data to be pushed to for display.
The design of the site is great and I'm mostly curious because it sounds like something I wish was available in the .NET world!
The design of the site is great and I'm mostly curious because it sounds like something I wish was available in the .NET world!