title: Generic name for the active log file
body: <p>I have the following <code>logback.xml</code> file for my spring boot application where I intend to create daily log files: </p>
  
  <pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt;
  &lt;configuration scan="true"&gt;
      &lt;appender name="rollingFile" class="ch.qos.logback.core.rolling.RollingFileAppender"&gt;
          &lt;rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy"&gt;
              &lt;!-- daily rollover --&gt;
              &lt;fileNamePattern&gt;./logs/my-log-file.%d{yyyy-MM-dd}.log&lt;/fileNamePattern&gt;
              &lt;maxHistory&gt;15&lt;/maxHistory&gt;
              &lt;totalSizeCap&gt;15MB&lt;/totalSizeCap&gt;
          &lt;/rollingPolicy&gt;
          &lt;layout class="ch.qos.logback.classic.PatternLayout"&gt;
              &lt;Pattern&gt;%d [%-5thread] [%-1p] [%logger{35}] - %msg%n&lt;/Pattern&gt;
          &lt;/layout&gt;
      &lt;/appender&gt;
  
      &lt;root level="WARN"&gt;
          &lt;appender-ref ref="rollingFile"/&gt;
      &lt;/root&gt;
      &lt;root level="INFO"&gt;
          &lt;appender-ref ref="rollingFile"/&gt;
      &lt;/root&gt;
  &lt;/configuration&gt;
  </code></pre>
  
  <p>The files are created like this:</p>
  
  <pre><code>my-log-file.2018-11-10.log
  my-log-file.2018-11-11.log
  my-log-file.2018-11-12.log
  </code></pre>
  
  <p>I am looking to have the current active log file without the date so it is generic name like <code>my-log-file.log</code> and only when the date rolls to a new day, the file is renamed with date. </p>
  
  <p>What change is required on the <code>logback.xml</code> to enable this configuration? </p>