Running : CLI v0.11.0, Server v0.11.0
(pulled from confluentinc/ksqldb-server:0.11.0)

Creating a stream with a field named "size" results in the following error :
extraneous input 'size' expecting {'EMIT'

It seems like size is considered a reserved keyword.
Creating the stream with CREATE STREAM trades ( "size" DOUBLE ) works.

Looks similar to https://github.com/confluentinc/ksql/issu

Currently, you are not able to use middleware per handler in "clean way" (you can still manually wrap the handler function, or have separated router).

It would be nice to be able to add middleware per handler.

As a good reference point, you can use chi router: https://github.com/go-chi/chi

我看到可以通过Prometheus搭建监控环境，如果有图文，更容易理解．