ppkarwasz opened a new pull request, #1171:
URL: https://github.com/apache/logging-log4j2/pull/1171

   This PR adds a minimal amount of methods to greatly simplify flow tracing 
with `LogBuilder`. E.g.:
   
   ```
   logger.traceEntry("a={}, b={}", 1, 42);
   ```
   
   can be now rewrittent as:
   
   ```
   logger.atTrace()
           .withMarker(AbstractLogger.ENTRY_MARKER)
           .logAndGet(() -> {
               LoggingSystem.getFlowMessageFactory()
                       .newEntryMessage("a={}, b={}", 1, 42);
           });
   ```
   
   The latter can be easily perfomed by a bytecode manipulation tool (cf. 
#1147).
   
   It also refactors the factory methods that create 
`EntryMessage/ExitMessage`s to be low-garbage.


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