Sempervivum flowers are beautiful. A word of warning though, they are monocarpic so that particular rosette will die once it has finished flowering. Don't worry, you haven't done anything wrong, that's just what they do. The adjacent rosettes will not die just yet
I'm really looking forward to seeing the flowers especially since this is the first flowering in the few years of growing them. While it takes so long to produce the flower, I figured it's gotta be worth waiting for.