My favourite window manager in linux was always ion3 that then became known as notion. I'm not sure if it was one of the first tiling/tab/split window managers but I started using it around the year 2000 and loved it. One feature that it seemed to have that a lot of other tiling windowmanagers didn't have is tabbed splits. Really nice to see this.
Sensu was originally built to solve the problem of having to monitor ephemeral nodes[1], now however, it's a a versatile monitoring platform. I would argue that it's much more than just what it was originally designed for.
Regarding RabbitMQ and difficulty in debugging: it's true. You can now use Redis as a transport if you like. I'm sure support for other transports will be added in time, too.
