[logback-dev] [JIRA] Created: (LBCLASSIC-260) Recording appender that dumps debug messages only when error occurs

[Tomasz Nurkiewicz (JIRA)]

Recording appender that dumps debug messages only when error occurs
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                 Key: LBCLASSIC-260
                 URL: http://jira.qos.ch/browse/LBCLASSIC-260
             Project: logback-classic
          Issue Type: New Feature
          Components: appender
    Affects Versions: 0.9.28
            Reporter: Tomasz Nurkiewicz
            Assignee: Logback dev list


Provide built-in utility appender that silently stores last few logging messages and dumps them (forwards to a target appender) only when an error occurs. Older logging events are replaced with new ones. This is a configuration example:

<configuration>
  <appender name="REC" class="ch.qos.logback.classic.RecordingAppender">
    <appender-ref ref="STDOUT"/>

    <maxEvents>1000</maxEvents>
    <dumpThreshold>WARN</dumpThreshold>
    <expiryTimeMs>15000</expiryTimeMs>
  </appender>

  <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
    <encoder>
      <pattern>%-4relative [%thread] %-5level - %msg%n</pattern>
    </encoder>
  </appender>

  <root level="DEBUG">
    <appender-ref ref="REC"/>
  </root>
</configuration>

Such an appender is crafted manually by several users, it would be nice to provide it out of the box. I already implemented this feature (100% test coverage):

https://github.com/nurkiewicz/logback/tree/recording-appender

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