example to add metrics for flink app
首先要启动单机版的flink cluster: start-cluster.sh, 在我的mac上，对应的位置是：/usr/local/Cellar/apache-flink/1.9.1/libexec/bin。 启动之后，在本地上可以通过8081端口来访问flink的UI
对于测试streaming的wordcount例子，自动service nc -lk 9999
运行类似flink run target/flink-metrics-1.0-SNAPSHOT.jar的命令来启动job
为了能够正常显示输出，我换成了datastream.writeAsText
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