GitHub user zentol opened a pull request:

    [FLINK-8621][prometheus][tests] Remove 

    ## What is the purpose of the change
    This PR removes an unstable test for the PrometheusReporter. The test 
verified that the metrics could no longer be polled when the reporter was 
shutdown, however if any other process were to start a server on the same port 
(which is free after the reporter shutdown) the test would fail.
    We could theoretically check in that case that it wasn't our reporter that 
responded, but that's a bit tricky to do with how the reporter currently works 
(singleton registry).
    This PR also contains 2 minor changes:
    * one commit adds a comment to the prometheus reporter to better reflect 
how the `HTTPServer` is used
    * one commit adds a utility port-range generator to prevent port-conflicts 
caused by copy&pasting

You can merge this pull request into a Git repository by running:

    $ git pull 8621

Alternatively you can review and apply these changes as the patch at:

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #5473
commit 53fa2376ddd1e47844ade0e74d27f5cd473b9816
Author: zentol <chesnay@...>
Date:   2018-02-13T09:31:31Z

    [FLINK-8621][prometheus][tests] Remove 
    The test is inherently unstable as it will always fail if any other
    server is started on the port between the closing of the reporter and
    the polling of metrics.

commit 41097c14074adb91506ff574b10340da924176a3
Author: zentol <chesnay@...>
Date:   2018-02-13T09:33:03Z

    [hotfix][prometheus] Document internal usage of 
    It appeared as if the HTTPServer wasn't actually doing anything, but it
    internally accessed the singleton registry that we also access to
    register metrics.

commit 25c04b965bfe6cdae889932bb3bc0c7913c718e3
Author: zentol <chesnay@...>
Date:   2018-02-13T09:33:31Z

    [hotfix][prometheus][tests] Add utility for generating port ranges



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