Luke Bullard created LOG4J2-2856:
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Summary: Custom fields in JsonLayout should not overwrite existing
fields
Key: LOG4J2-2856
URL: https://issues.apache.org/jira/browse/LOG4J2-2856
Project: Log4j 2
Issue Type: Improvement
Components: Layouts
Reporter: Luke Bullard
When I added custom fields to the JsonLayout, I was expecting these fields to
be added to the original message. What I instead observed was the following.
The original message, of format:
{
"thread" : "main",
"level" : "INFO",
"loggerName" : "com.ibm.sterling.afc.common.external.PrometheusServlet",
"message" : "Started the Prometheus Metrics Server",
"endOfBatch" : true,
"loggerFqcn" : "org.apache.logging.log4j.spi.AbstractLogger",
"contextMap" : \{ },
"instant" : {
"epochSecond" : 1590165722,
"nanoOfSecond" : 968000000
},
"threadId" : 1,
"threadPriority" : 5
}
Became the following format:
{
"logEvent" : "Started the Prometheus Metrics Server",
"key1" : "value1",
"key2" : "value2"
}
Is there a way to add additional fields to a JsonLayout without losing out on
the other valuable information? The docs don't make this clear if so, and trial
and error has been fruitless. If this isn't possible, then could this
functionality be added?
Thank you
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