org.apache.skywalking:apm-toolkit-log4j-2.x (maven):  The Apache Software Foundation provides support for the Apache community of open-source software projects. The Apache projects are characterized by a collaborative, consensus based development process, an open and pragmatic software license, and a desire to create high quality software that leads the way in its field. We consider ourselves not simply a group of projects sharing a server, but rather a community of developers and users. 
Keywords: apm|dapper|distributed-tracing|logging|metrics|observability|skywalking