GitHub user lamber-ken opened a pull request:

    https://github.com/apache/flink/pull/5855

    [FLINK-9179] add prometheus pushgateway reporter

    ## What is the purpose of the change
    This pull request makes flink system can send metrics to prometheus via 
pushgateway. when using `yarn-cluster` model, it's useful.
    
    ## Brief change log
    
      - Add prometheus pushgateway repoter
      - Restructure the code of the promethues reporter part
    
    ## Verifying this change
    
    This change is already covered by existing tests. [prometheus 
test](https://github.com/apache/flink/tree/master/flink-metrics/flink-metrics-prometheus/src/test/java/org/apache/flink/metrics/prometheus)
    
    ## Does this pull request potentially affect one of the following parts:
    
      - Dependencies (does it add or upgrade a dependency): (yes)
      - The public API, i.e., is any changed class annotated with 
`@Public(Evolving)`: (no)
      - The serializers: (no)
      - The runtime per-record code paths (performance sensitive): (no)
      - Anything that affects deployment or recovery: JobManager (and its 
components), Checkpointing, Yarn/Mesos, ZooKeeper: (no)
      - The S3 file system connector: (no)
    
    ## Documentation
    
      - Does this pull request introduce a new feature? (yes)
      - If yes, how is the feature documented? (JavaDocs)


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

    $ git pull https://github.com/lamber-ken/flink master

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

    https://github.com/apache/flink/pull/5855.patch

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

    This closes #5855
    
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commit 7332c6df905f3f9d56615618fb000d2449109f3f
Author: xl38154 <!@...>
Date:   2018-04-16T12:58:44Z

    add prometheus pushgateway reporter

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