https://luminusweb.com/docs/logging.html AIUI you can either raise the root log level (past DEBUG) or you can set the logging level of undertow

<logger name="io.undertow.websockets" level="warn" />

Thank you! I ended up doing that, too, but I wish I could do something less brutal than silencing all debug level log entries.

Looks like luminus uses timbre as a wrapper as well, and timbre mentions more specific filters, ie by namespace and log level. http://ptaoussanis.github.io/timbre/taoensso.timbre.html#var-default-config or https://github.com/ptaoussanis/timbre#log-levels-and-ns-filters-basics Might have a solution for you, and probably nicer than XML configs