sample-clients org.wso2.ei 4.2.0 4.0.0 WSO2 Streaming Integrator Tooling - Prometheus Source - Event Client prometheus-client pom org.apache.logging.log4j log4j-core javax.mail mail javax.jms jms com.sun.jdmk jmxtools com.sun.jmx jmxri io.siddhi siddhi-core commons-logging commons-logging org.apache.maven.plugins maven-compiler-plugin 1.8 1.8