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https://issues.apache.org/jira/browse/LOG4J2-3200?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17452433#comment-17452433
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Rémi C. commented on LOG4J2-3200:
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Hi Ralph,
Thank you for the answer. I am looking at my options here.
The log4j-audit is asking to implement some code and I am looking to insert
it in multiple applications with only configuration.
I thought that was possible with Log4jServletFilter because it require to
only modify the web.xml.
In that perspective, I would prefer a solution that require only to change
the configuration because I am not sure if the trace_id is in the
RequestContext. In Dynatrace, they who the trace id under the request header
section.
Briefly, 3 questions.
1- Can Log4jServletFilter access a custom trace id in the request header? I see
that we can access a web:header.name in the doc (see:
[https://github.com/apache/logging-log4j2/blob/master/src/site/asciidoc/manual/lookups.adoc)]
2- Is the RequestContext part of the requestHeader?
([https://stackoverflow.com/questions/48882641/remove-request-context-from-response-header).]
If so, then can I access it with the Log4jServletFilter? Is Open Telemetry
suppose to be in the Request-Context?
3- Does log4j audit can work with a combination of configuration and a common
library that would hold the classes or it need to be implemented in each
application?
I found that Log4jServletFilter was a really interesting solution.
> Log4j2 compatibility with Open Telemetry
> ----------------------------------------
>
> Key: LOG4J2-3200
> URL: https://issues.apache.org/jira/browse/LOG4J2-3200
> Project: Log4j 2
> Issue Type: Question
> Components: Filters
> Reporter: Rémi C.
> Priority: Blocker
>
> Hello,
> I am trying to fetch the trace id generated by open telemetry with only
> configuration in log4j2.xml file and web.xml file.
> I created a stack overflow ticket, see :
> [https://stackoverflow.com/questions/70194344/how-to-access-request-header-value-with-log4j2]
>
> Is it possible with the log4j2 lookup to be compatible with open telemetry?
> I tried to use ${web:header.traceId} and it just does not work. I have
> followed the config. So, am I missing something to make it work?
> I saw that even without the web.xml config I added, the ${web:rootDir}
> still works.
> There is almost no information on the internet on how to make it work with
> Open Telemetry so I am asking to the expert here. Open Telemetry is basically
> a field/value that is set in the HTTP request header.
>
> Thank you
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