[GitHub] flink issue #4586: [FLINK-7502] [metrics] Improve PrometheusReporter

[zentol]

Github user zentol commented on the issue:

    https://github.com/apache/flink/pull/4586
  
    This is rather odd. This minimal example does fail as expected:
    ```
    
        
        public static void main(String[] args) throws IOException {
                HTTPServer s1 = null;
                HTTPServer s2 = null;
                try {
                        s1 = new HTTPServer(9010);
                        s2 = new HTTPServer(9010);
                } finally {
                        if (s1 != null) {
                                s1.stop();
                        }
                        if (s2 != null) {
                                s2.stop();
                        }
                }
        }
    ```


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