When executing a new command with app exec (--no-reuse) a new container is run with a command like:

$ kamal app exec 'echo hello'
...
 DEBUG [4b3c06fc] Command: docker run --rm --network kamal _env-options _options _image_name echo hello
...

I wonder if it is a design choice to not include *role.logging_args here:

I see that the command echo hello is logged in audit.log, but all the output from the command itself isn't logged with kamal configured logging driver.

I'd be happy to contribute by enabling logging in kamal app exec. Though, it needs to be noted that the logs emitted in a "reused" container won't appear in the kamal configured logging driver. This is due to the fact that docker exec creates a new process inside the running container and has its own stdout.