This quick post provides information about the sitecore_suggested_test_index, which I have found to be problematic in some large Sitecore 8.x implementations.
Sitecore 8.1 is released this week and with it comes a couple of major improvements to the behavioural profiling system. This post makes an initial exploration of these new features and the mechanics underpinning them.
I am an idiot. I'm writing this post in case you're an idiot too. It concerns a nasty looking, but ultimately harmless error in Sitecore 8's Experience Analytics screen that caught me out more than once.