[clhodapp]

The AppEngine Standard Java 8 API is severely limited because it is coupled to the Servlet API, which severely screwed up on the design of its async API. As a Scala developer, this limitation pretty much sinks the platform for me, since the flexible environment is really expensive and has a worse value proposition vs managed Kubernetes.

[haimez]

App engine flex is a “bring your own container” set up.

[clhodapp]

Right, but at that point, you almost might as well move up to "full" Kubernetes if you know it. I'm not saying that there's no use case for App Engine flex, just that it is kind an uncomfortable middle-ground between standard and k8s.

[devlance]

Worth pointing out that Cloud Run was just released and maybe better meets your needs? https://cloud.google.com/run/