Hello all, I need to name my log file as /${host-name}.log/ and the question is, how can I do it? In logback.xml I can use properties definition, but it's static, not dynamical evaluabled. System properties can't help me to, I can't define host on every application start. I can use LoggerContext, but I don't want to have 'compile' dependencies on logback classes. In version 0.9.17 was made possibility to save formatted timestamp in property. May be possible to create property evaluator tag, to dynamical define some properties value? Something like this: <property name="host name" evaluator="org.xxx.PropertyEvaluator"> <parameter name="host type">value</parameter> </property> Evaluator will be called on property initialization with listed parameters. I can make necessary patch for logback. May be I have said well-known truths :) Sorry and correct me. Best regards, Aleksey Didik