anchor.diff:        name: test
         logFormat: '%c{20}: %m%n'
         file: target/logback/testRun_Debug.log
  +      filters:
  +        - type: threshold
  +          level: info
   ----
   "log" is a root element of the Logback configuration and is bound to a https://github.com/bootique/bootique-logback/blob/master/bootique-logback/src/main/java/io/bootique/logback/LogbackContextFactory.java[`LogbackContextFactory`] object. It supports the following properties:
   
  
positive.code: 
  |`rollingPolicy`
  |none
  |An object that defines a log rotation policy. Examples are given below.
  |===
  
  There are a few ways log file rotation can be configured for the "file" appender, as defined by the `rollingPolicy`. Out of the box the following Logback policies are supported: http://logback.qos.ch/manual/appenders.html#FixedWindowRollingPolicy[`fixedWindow`], http://logback.qos.ch/manual/appenders.html#TimeBasedRollingPolicy[`time`], `sizeAndTime`.
  
  ==== "fixedWindow" Rolling Policy
  
  
negative.code: |`target`
  |`stdout`
  |Whether to log to standard output or standard error. Possible values are `stdout` and `stderr`
  
  |`filters`
  |none
  |A collection of filters to use with this appender
  |===
  
  ."file" Appender Property Reference
  