Clojurians Log v2

Hello guys, any idea how to setup working Sentry appender (from 3rd party appenders)? I have a configuration like

{:level :info
 :ns-blacklist ["com.mchange.*"] ;disable Korma DB pool logging
 :appenders {:spit (rotor-appender {:path "mylog.log"
                                    :backlog 10})
             :sentry (sentry-appender {:dns "url"})}}

Spit appender is correctly logging to a file (and rotating it), however Sentry logger is not doing anything and I am not sure how test it 🙂 If course there is a real dns URL