4.0.0 org.apache.skywalking apm-sdk-plugin 5.0.0-alpha apm-xmemcached-2.x-plugin xmemcached-2.x-plugin jar UTF-8 2.0.0 com.googlecode.xmemcached xmemcached ${xmemcached.version} provided org.apache.logging.log4j log4j-core 2.4.1 test