AFAIK you can't run a gRPC server on App Engine, but you can access other gRPC services (like all the GCP APIs) as a client. I might be wrong about the server part.
All those things you mentioned in the edit should be supported in the new runtime.
Edit: I see what you mean. The deeply integrated services are removed in favor of more portable solutions, like Logging moving to Stackdriver Logging (though stdout is still logged automatically), Users moving to Firebase Auth, etc. Cron should still work fine though.
All those things you mentioned in the edit should be supported in the new runtime.
Edit: I see what you mean. The deeply integrated services are removed in favor of more portable solutions, like Logging moving to Stackdriver Logging (though stdout is still logged automatically), Users moving to Firebase Auth, etc. Cron should still work fine though.
(I work for GCP)