The lead story in this edition of the newsletter is Phil Sturgeon's piece on how to evolve an API design without breaking. Usually, people resort to versioning in these cases. Phil does an excellent job of illustrating an alternative way.
There's also a bit from Matt McLarty on the future of microservices, and more from Sarah Elson on testing. Good, fundamental stuff on tap.
You can find the web version of the newsletter email here: https://tinyletter.com/NetAPINotes/letters/rest-api-notes-for-2018-05-09
Past editions of the newsletter can be found here: http://tinyletter.com/NetAPINotes/archive.
A comprehensive list of upcoming web events that I maintain can be found at webapi.events.