Volkan Yazıcı released log4j2-logstash-layout v0.15.

From the announcement message on the log4j-user mailing list:

In addition to the default JSONLayout shipped in Log4j 2, there is also another layout plugin that you
can use to render customized JSONs: log4j2-logstash-layout (https://github.com/vy/log4j2-logstash-layout).

A couple of hours ago I released v0.15 of the plugin to Maven Central. This release ships
a garbage-free implementation that makes log4j2-logstash-layout the
fastest and only garbage-free JSON layout
plugin out there in the wild. If
you have a use case for JSON layout, you should definitely give
log4j2-logstash-layout a try.

Feedback is welcome!

Volkan Yazıcı