[jira] [Created] (FLINK-4192) Move Metrics API to separate module

[Shang Yuanchun (Jira)]

Chesnay Schepler created FLINK-4192:
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             Summary: Move Metrics API to separate module
                 Key: FLINK-4192
                 URL: https://issues.apache.org/jira/browse/FLINK-4192
             Project: Flink
          Issue Type: Improvement
          Components: Metrics
    Affects Versions: 1.1.0
            Reporter: Chesnay Schepler
            Assignee: Chesnay Schepler
             Fix For: 1.1.0


All metrics code currently resides in flink-core. If a user implements a reporter and wants a fat jar it will now have to include the entire flink-core module.

Instead, we could move several interfaces into a separate module.

These interfaces to move include:
* Counter, Gauge, Histogram(Statistics)
* MetricGroup
* MetricReporter, Scheduled, AbstractReporter

In addition a new MetricRegistry interface will be required as well as a replacement for the Configuration.




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