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https://jira.qos.ch/browse/SLF4J-422?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=19162#comment-19162
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Eric Pabst commented on SLF4J-422:
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This hasn't gotten ANY attention for over 4 months! It looks like Log4J 2
doesn't have this issue at all, so it looks like it's worth switching
frameworks. Its MapMessage does what I need, and JSON is directly supported
rather than separate in logstash.
> Have slf4j-log4j12 include extra arguments to Logger methods
> ------------------------------------------------------------
>
> Key: SLF4J-422
> URL: https://jira.qos.ch/browse/SLF4J-422
> Project: SLF4J
> Issue Type: Improvement
> Components: Implementations
> Affects Versions: 1.7.22
> Environment: All
> Reporter: Eric Pabst
> Assignee: SLF4J developers list
>
> The purpose of logging to slf4j is to allow code to log information without
> worrying about which implementation and format will be used for actual
> logging. In deployed environments, we prefer JSON logging using logstash to
> be consumed by Splunk, which handles JSON very nicely. However, for local
> development and testing, we prefer text output via log4j or logback-classic.
> We often want to log extra fields to show up in the JSON output such as
> {{\{ "timestamp": "2017...", "message": "Event X happened", "userName":
> "bob", "url": "http://..."}}}
> To accomplish this, we use logstash's StructuredArgument to provide extra
> arguments to the Logger:
> {{import static net.logstash.logback.argument.StructuredArguments.keyValue;}}
> {{...}}
> {{ LOGGER.info("Event X happened", keyValue("userName", "bob"),
> keyValue("url", "http://...";));}}
> We don't want to include \{}'s in the message or else it would log the
> username and url both in the message and as separate JSON properties.
> However, when binding to slf4j-log4j12, it is logged without these extra
> arguments:
> {{INFO 2017... Event X happened}}
> It would help immensely to include these extra arguments automatically if
> present:
> INFO 2017... Event X happened username=bob url=http://...
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