One option is the SequenceNumber <https://github.com/apache/logging-log4j2/blob/76d78fe9a4adecebd9805d051a1606b2ac70ccd0/log4j-core/src/main/java/org/apache/logging/log4j/core/pattern/SequenceNumberPatternConverter.java> pattern converter %sn in PatternLayout <https://logging.apache.org/log4j/2.x/manual/layouts.html#PatternLayout>. This uses a static counter, so if you need to keep separate track of multiple appenders this may not be useful. What you could do then is create a custom pattern converter plugin or lookup plugin.
On Sun, Dec 11, 2016 at 8:40 PM, Guy Marom <marom....@gmail.com> wrote: > Hello everyone, > I want to count all the logging events into our metrics system > (Prometheus). Our devs are using this to create alerts for Error/Fatal/Warn > events. > > I gave up using filters because they catch all the events and not just the > ones that are actually written to the logger. > > My current idea is to use a rewrite appender with my own rewrite policy > which will just increment the relevant counter and not modify the event. > The problem with this approach is again the filters, if an appender has a > filter defined then I will count events that end up discarded. > > Is there some post-logging hook I can use? An event maybe? Any help will > be much appreciated... > Thanks, > Guy Marom >
