[logback-dev] [JIRA] (LOGBACK-1415) {{prefix}} composite converter

[QOS.CH (JIRA)]

Ceki Gülcü created LOGBACK-1415:
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             Summary: {{prefix}} composite converter
                 Key: LOGBACK-1415
                 URL: https://jira.qos.ch/browse/LOGBACK-1415
             Project: logback
          Issue Type: Improvement
            Reporter: Ceki Gülcü
            Assignee: Logback dev list


In order to help output parsers, it is sometimes useful to prefix log output with the key of each item.

*Example 1:*
{code}%X{user} {code}
would be easier to parse if it were written as
{code}%X{user} {code}

*Example 2:*
{code}%X{user} %{sessionId} %level %logger %msg{code}
would be easier to parse if written as
{code}user=%X{user} sessionId=%{sessionId} level=%level logger=$logger msg=%msg}{code}

The {{prefix}} composite converter automates the process. Thus, the following patterns generate equivalent output
{code}%prefix(%X{user} %{sessionId} %level %logger %msg){code}
and
{code}user=%X{user} sessionId=%{sessionId} level=%level logger=$logger msg=%msg}{code}
{code}user=%X{user} sessionId=%{sessionId} level=%level logger=$logger msg=%msg}{code}



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