参考文档:
https://ci.apache.org/projects/flink/flink-docs-release-1.3/monitoring/metrics.html
实际代码:
package metric
import java.util.Properties
import com.sjb.constant.Constants
import org.apache.flink.api.common.functions.RichMapFunction
import org.apache.flink.api.common.serialization.SimpleStringSchema
import org.apache.flink.streaming.api.scala.StreamExecutionEnvironment
import org.apache.flink.stream