caddy/caddytest/integration/caddyfile_adapt/global_options_log_basic.txt

{
	log {
		output file foo.log
	}
}
----------
{
	"logging": {
		"logs": {
			"default": {
				"writer": {
					"filename": "foo.log",
					"output": "file"
				}
			}
		}
	}
}