Ahmet Altay created BEAM-8429:
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             Summary: Define API for getting non user metrics.
                 Key: BEAM-8429
                 URL: https://issues.apache.org/jira/browse/BEAM-8429
             Project: Beam
          Issue Type: Bug
          Components: sdk-java-core, sdk-py-core
            Reporter: Ahmet Altay


MetricResults API does not support a way to query system metrics. Different 
implementations accomplish the same thing in different ways.

FnApiRunner has a monitoring_metrics() defined on its PipelineResult 
(RunnerResult) object.
DataflowRunner, has a all_metrics() method defined on its MetricResults 
(DataflowMetrics) object.

Dataflow implementation of using metrics().all_metrics() sound reasonable. It 
would be usefult to define a single API that all runners implementations could 
agree on.

cc: [~pabloem] [~robertwb] [~Ardagan]



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