@echauchot Sorry, could you give me a bit of background? The Beam metrics are 
mapped to Flink Accumuators, rather than to Flink Metrics. In Flink, the 
distinction is:

  - Metrics are for monitoring, collecting statistical information, possibly 
approximate
  - Accumulators are meant to be part of the application logic, side 
aggregates, must be exact and are meant to be used by the client program in a 
session mode (multiple jobs)

I assume that Beam metrics need to go to Flink Accumulators, rather than Flink 
Metrics?

[ Full content available at: https://github.com/apache/beam/pull/4548 ]
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