@ajamato A more general question for my knowledge: as the communication between 
runner harness and SDK harness is done on a bundle basis. When the runner 
harness sends data to the sdk harness to execute a transform that contains 
metrics, does it: 

1. send metrics values (for the ones defined in the transform) alongside with 
data and receive an updated value of the metrics when the bundle is finished 
processing? 
2. or does it send only the data and the sdk harness responds with a diff value 
of the metrics so that the runner can update them in its side?

My bet is option 2. But can you confirm?

[ Full content available at: https://github.com/apache/beam/pull/6205 ]
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