A Global Filter can be called once during the isEnabled check and then again when the event is actually logged. But Filters that are attached to Loggers, Appender-Refs and Appenders should only be called once. I am not sure why thought would be any different with an Async appender.
Ralph > On Aug 4, 2020, at 12:55 PM, Dennys Fredericci <den...@fredericci.com.br> > wrote: > > Hi All, > > There is a library micrometer(https://micrometer.io/) used to collect > metrics, one of these metrics is a log rate, several calls for log.info, > log.debug, log.warn, etc. > > Micrometer implements a > Filter(org.apache.logging.log4j.core.filter.AbstractFilter) and for each call > to the method filter we increment a counter. > > After some research, I noticed that the method filter can be called multiple > times especially when an Async appender is configured and in this case, we > have a wrong logging rate. An application called on time the method > log.info("Test..") but the rate can easily be 2 instead of 1. > > I tried to implement a solution but still not correct. > > Now I am wondering if Filter still feasible for this use case, I am quite > convinced that will be not possible to use Filter to solve this. > > So, now my question is: Is there another way to get the number calls for > each logging level? Or is there a workaround that can be implemented on the > Filter implementation to do the correct count? > > Regards, > Dennys Fredericci > > >
