session-store-gcloud module broken logging dependency

[janbartel]

jetty-10 head

[589] java -jar ../jetty-home/start.jar --add-modules=session-store-gcloud
ERROR : Module logging-jul provides logging, which is already provided by logging-jetty enabled in [transitive provider of logging for threadpool, transitive provider of logging for logging-jcl-capture]

Usage: java -jar $JETTY_HOME/start.jar [options] [properties] [configs]
java -jar $JETTY_HOME/start.jar --help # for more information

Our documentation says:

As GCloud requires certain Java Commons Logging features to work correctly, Jetty routes these through SLF4J by transitively enabling the jcl-slf4j module during installation. Therefore, you will also need to enable one of the SLF4J implementation modules. You can either choose one ahead of time and enable it at the same time as the session-store-gcloud module, or you can just enable session-store-gcloud module and it will print out a list of available SLF4J implementations. You can then choose one and enable it.

Either the module or the documentation or both are broken.