Felix placement kept every broker's leader count near the cluster-wide share, and a single stream could still land 1/1/10 with all its writes on one broker; this is how placement now spreads each stream's leaders too.
How Felix keeps one slow subscriber from holding up publishers or other readers, and how a 2% single-publisher loss came from where the feeder gave back a subscriber's byte budget.
What Felix is, how a publish travels from a client to disk to every subscriber, why it is built that way, and how to run it on your laptop in five minutes.
