4.0.0 org.skywalking apm-sdk-plugin 5.0-2018-preview apm-spymemcached-2.x-plugin spymemcached-2.x-plugin http://maven.apache.org UTF-8 2.11.1 net.spy spymemcached ${spymemcached.version} provided org.apache.logging.log4j log4j-core 2.4.1 test