[jira] [Created] (FLINK-4532) Allow independent metrics reporter for tasks

["Renkai Ge (JIRA)" <ji...@apache.org>]

Renkai Ge created FLINK-4532:
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             Summary: Allow independent metrics reporter for tasks
                 Key: FLINK-4532
                 URL: https://issues.apache.org/jira/browse/FLINK-4532
             Project: Flink
          Issue Type: Improvement
          Components: Metrics
            Reporter: Renkai Ge


Currently,  JobManager, TaskManager and Task share the same configuration of reporters, and implementations of org.apache.flink.metrics.reporter.MetricReporter  should be in classpath before JobManager started. 
In a cluster with multi tenancy, cluster administrator may want to monitor the cluster metrics in one place, and the owner of a application want to view the metrics of their application in somewhere else, and they may put custom MetricReporter in the application jar if the classpath don't provide one.

I want to implement this by:
	1. Make it possible to load MetricReporter from userCodeClassLoader.
	2. Put new API into ExecutionConfig like {code}public long enableAdditionalMetricReporters(List<String> classNames,boolean disableGlobalMetricReporters);{code}

I will begin to work on this if you guys agrees.



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