Anshu Garg created LOG4J2-1244:
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             Summary: Provide a way to make header and footer values 
customizable in JSONLayout in Log4j 2
                 Key: LOG4J2-1244
                 URL: https://issues.apache.org/jira/browse/LOG4J2-1244
             Project: Log4j 2
          Issue Type: Improvement
          Components: Layouts
            Reporter: Anshu Garg


It will be helpful to provide a way to customize header and footer in 
JSONLayout in Log4j 2.

For instance user is writing a logging application which logs requests and 
responses to/from a server to log files in JSON format. Now user also wants to 
log server specific information in each log file but since it will be common 
for all request/response, it is not desired to be logged with each log entry so 
user wants to add server specific common information at start of the file. As 
header in JSON format or in this use case. This will be followed by each 
request and response logged as a JSON array element. And at rollover this JSON 
array and main JSON object  (which contains header and JSON array) should  be 
closed with help of footer.

A typical file will be something like ...

{"Header":{"ServerName":"MyAppServer"},"LogEntries":[{"Message":"Request 
message1","RequestingAddress":"127.0.0.1","TimeStamp":"2016-01-05_07-24-59"},
{"Message":"Request 
message1","RequestingAddress":"127.0.0.1","TimeStamp":"2016-01-05_07-24-59"},
{"Message":"Request 
message1","RequestingAddress":"127.0.0.1","TimeStamp":"2016-01-05_07-24-59"},
{"LogEndMarker":"END"}]}



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