Hi Adam, I have somehow got a link to InheritableMDC.scala [1] but cannot find the message that led to it. Can you please point me to where you mentioned InheritableMDC, assuming it was you? Many thanks, [1] https://gist.github.com/adamw/7891bcda3251d6966d1ea35d824edc80 -- Ceki Gülcü Sponsoring SLF4J/logback/reload4j at https://github.com/sponsors/qos-ch