Make browser IP address appear in WARN log

templates/etc/shibboleth-idp/conf/logback.xml.erb

@@ -125,7 +125,7 @@
 
         <encoder class="ch.qos.logback.classic.encoder.PatternLayoutEncoder">
             <charset>UTF-8</charset>
-            <Pattern>%date{ISO8601} - %level [%logger:%line] - %msg%n%ex{short}</Pattern>
+            <Pattern>%date{ISO8601} - [%mdc{idp.remote_addr}] %level [%logger:%line] - %msg%n%ex{short}</Pattern>
         </encoder>
     </appender>