Major Description
The README.md in Samza still mentions 'incubator' in its Travis CI button. It also still contains the 'pardon our dust' section that was removed in SAMZA-520.
docs/index.md also contains a 'limits' section that's outdated. It's true that Samza only provides at-least-once messaging guarantees, but this isn't worth calling out, since everybody does (or tries to).